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Connecting your car speakers to an amp

Tip: You can use your vehicle's factory wiring

Installing an amplifier

Sending the audio signal from a receiver to a 4-channel amplifier's inputs via RCA cables or the amp's speaker-level inputs is straight forward and simple enough, but getting the amplified signal back to the speakers—well that's another matter.

This article discusses adding an amplifier to an aftermarket stereo. For tips on connecting an amplifier to a factory stereo, read this article instead.

Getting signal to the speakers

The speakers are usually in four different corners of your vehicle, and running separate new speaker wires to each one presents many challenges, including how to get the wire past the car door hinges to the front door speaker locations.

A convenient way to send the powered signal from your amplifier to your speakers is to run the speaker wires back to the harness behind your stereo, where all your car’s speaker connections are accessible in one place.

Which speaker wires go where?

Normally, when you install a new stereo, all the wires from the stereo would connect to the car wiring adapter. The wires would run from one black connector to the other (the right side of the photo below).

But since we're using an external amplifier for the speakers, the speaker wires from the car get diverted to the amp — that's the bundle of wires on the bottom plug heading left to the amplifier.

The speaker wires from the new stereo aren't used. You can either cut them off (like we did in the photo below) or just tape them up – each wire individually – so that none of the wire ends can touch anything else.

Meanwhile, the RCA cables carry the audio signal to the amplifier and the blue wire from the stereo turns on the amp whenever the stereo is turned on. And yes, fade and balance controls will still work fine, so long as you connect the RCA cables correctly.

StreetWires iCS920C multi-conductor cable

New speaker wires from the amp connect to the speaker wires in the stereo adapter harness

Running the amp's output wires to the wires on the adapter harness is how you avoid having to run new speaker wiring throughout the car. That's the bottom side of the triangle in the photo — speaker wires from the amp connect to the speaker wires on the adapter harness. Then that harness plugs into your car.

For 4-speaker systems, you'd need to make eight connections — a positive and negative wire for each speaker. This means, you just need to run the eight speaker wires from the dash to the amplifier, just like you do the RCA cables. In fact, when you're installing the amp, it's smart to run the RCA cables and new speaker wires at the same time.

EFX 9-wire Ultra Flex speaker wire

EFX 9-wire Ultra Flex speaker wire

Some products to help you do it

Crutchfield offers a 12-foot and a 20-foot 9-wire cable that helps simplify running eight speaker wires plus a remote turn-on lead from your amplifier to the rear of your receiver. We also carry a small selection of highly conductive, pure copper speaker wire, available by the foot, that will also work well, if you don't want the 9-wire, all-in-solution used above.

A multi-pack of Posi-Products Car Stereo Connectors could come in handy here, so you can make all the speaker connections without having to solder anything.

High-power amps need bigger wires

For amplifiers with more than 75 watts RMS of output per channel, it may be better to go ahead and run new 14- or 16-gauge speaker wires directly from the amp to each speaker.

Factory speaker wires are very thin, with high electrical resistance, so they can cause noticeable power loss when higher wattages try to get through. But amplifiers of 75-watts or less aren't really affected by this, so running their outputs through factory wiring remains a practical and convenient solution.

Let us know what you need

This article focused on a way to simplify the speaker connections when using an aftermarket stereo. If you're connecting an amplifier to a factory system, check out this How To guide for tips. For information about other aspects of amplifier installation, like power and ground wiring, check out our Amplifier Installation Guide.

If you have any questions about connecting a new amplifier to your speakers, contact our advisors via chat or phone. They'll take the time to answer your questions and explain the details, then get you set up with whatever you need. 

  • Edwin Negron from Orlando

    Posted on 11/13/2020

    I have a crunch 4 channel 1000w amp im using for my stock mitsubishi outlander sport es speakers. Is it going to sound louder or would it not make a difference since In this article it said anything past 75 it would cause power loss. So I should wait to install it until I get aftermarket speakers?

    Buck Pomerantz from Crutchfield

    on 11/13/2020

    Edwin, For amplifiers with that much output per channel, it may be better to go ahead and run new 14- or 16-gauge speaker wires directly from the amp to each speaker.
  • Walter Hopkins from Oxford

    Posted on 10/23/2020

    Thank you very informative.

  • Tim Joo from Los Angeles

    Posted on 10/14/2020

    Recently, I wired up the harness supplied by the JVC head unit to a Metra harness, including the various wires for the door speakers. If I'm reading this correctly, the output wire from the amp, instead of the head unit, should be connected to the Metra harness? Also, my speaker has an external crossover. How do I know which wires carry the full range signal? (2009 Mazda Miata)

  • Kenneth Thompson from Westerville

    Posted on 9/2/2020

    How to connect 6×9 speakers and tweeters to factory amp

    Buck Pomerantz from Crutchfield

    on 9/3/2020

    Kenneth, If you bought your speakers at Crutchfield, you could call Tech Support for free help with your system. Their toll-free number would be on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • Barney Guyett from Omaha

    Posted on 8/12/2020

    Buck Hooking up a single channel Alpine PDX-1.600 in 2006 Honda Civic SI to run a Alpine R-W 12D2 sub We just disconnected the existing sub and hooked it to the amp via RCA's then to the 12" sub Does this sound correct(ok)?

    Buck Pomerantz from Crutchfield

    on 8/13/2020

    Barney, If it works and sounds good, rock on.
  • Dawson

    Posted on 8/8/2020

    Hi, I was wondering that if I wanted to run my two tweeters on a single channel would I only have to connect the positive to the negative of the other and then use the free + and - to the amp for a 2 ohm on 1 channel

  • RIchard from Honolulu

    Posted on 7/12/2020

    Planning on adding a Jensen 4 channel amp I already have; 4x75W rms. Front two speakers are Pioneer 2x30 rms, 180w max Rears are mid woofers; not worried about them. Ideally, I would like to upgrade front speaker wires; but I'm not willing to go through the trouble of opening panels, and trying to fish through door harness (for clean look). Are there any huge drawbacks of hooking this amp to the front oem speaker wires? Not sure what oem gauge is, but car is 95 Accord LX. Slightly concerned if the increased power will burn out the oem wires or anything like that.

    Buck Pomerantz from Crutchfield

    on 7/13/2020

    Richard, Your OEM wiring will survive the 75 watts RMS per channel, but your 30 watts RMS rated speakers probably won't.
  • Demetris Trowers from Baltimore

    Posted on 7/6/2020

    I'm planning on running (2) 8inch skar mid range speakers(200 rms each) and (2) 6.5inch skar mid range (150rms each) in each front door. Which amp(s) should i get for this setup, which size wires for speakers and whats the best way to set this up in terms of how can i run wires to each one.

  • Quinten Evans from Amarillo

    Posted on 7/2/2020

    I plan on installing an entry level 1800 watt planet audio 5 channel amp and an 8" planet audio sub in a small sealed enclosure. (9 wire t harness for high level and a schose LOC for RCA to sub channel) I have wired the sub to a 2 ohm load. My questions....1. Can I amplify factory door speakers? If so, what would you recommend setting voltage at for rms rating? The amp advertises about 75 watt rms on component side. 2. The subwoofer ( 35 bucks on amazon) says its rated at 600 watts rms. The amp says its rated 600 watt rms on sub channel at 2 ohms. I call bull****. Where would you start at for voltage /rms on that type of sub?

    Buck Pomerantz from Crutchfield

    on 7/2/2020

    Quinten, Without knowing the RMS rating of your speakers, we can't help you with setting the amp gain for them by voltage. We recommend using well-known music and your ears to set gain for speaker amps. For the sub, 34.6 volts through a 2-ohm load produces 600 watts RMS.
  • Charlie from London.

    Posted on 6/29/2020

    Hi, I have an amp powering my sub. I am trying to wire in an amp to power the aftermarket system I have had put in in the front of the car. Can I not run RCA's from my headunit to the amp and run the cables from the amp direct to the powerbass crossover I have had installed with the front speakers(4xmids and 2xtweeters)? Instead of running all the cables again? Thanks, Charlie

    Buck Pomerantz from Crutchfield

    on 6/30/2020

    Charlie, Yes, you can use that method instead of using a 9-conductor cable.
  • Brian Hill from Sunbury, Ohio

    Posted on 6/26/2020

    Please Help.... I want to add a 4 channel amp to power new door and rear deck speakers, but I'm retaining my factory head unit. Will I have to run new speaker wires or can I use a AudioControl Lc2i to get the signal? If I can , how do I get the speaker signal without tearing my dash apart?

    Buck Pomerantz from Crutchfield

    on 6/29/2020

    Brian, If you're connecting an amplifier to a factory system, check out this How To guide for tips.
  • Nick Adams from Phoenix

    Posted on 6/24/2020

    Your explanation of wiring an aftermarket 4 channel amp with a factory head unit seems pretty straight forward. I'm looking to run a 5 channel so I can add a sub. Does that change much of how I need to hook it up?

    Buck Pomerantz from Crutchfield

    on 6/25/2020

    Nick, Most 5-channel amps have input selection switches so you won't need a separate subwoofer input channel to deal with, just speaker wire connected to the sub.
  • Michael Carter from Alexandria, VA

    Posted on 6/19/2020

    Front door speakers to a 2005 Scion tC and install are cutting in and out while driving (especially over bumps). I have two amps in the car - 1 for the 4 speakers and 2 tweeters, 1 for the subwoofer. I've adjusted the fader to finally narrow the problem down to the front door speakers (which include the 2 tweeters). I'm certain it's either a speaker problem or wiring problem. Is it common for the wiring to degrade to where the front speakers on the doors are cutting in and out or could it just be a loose connection on the speakers themselves, or something else?

    Buck Pomerantz from Crutchfield

    on 6/20/2020

    Michael, It sounds like a loose connection somewhere. Check and secure all wiring connections, specially grounds.
  • Joe from Oregon City

    Posted on 6/17/2020

    Can I use both the RCA outputs to the amp and the factory speakers to add more speakers to the system? For example: I have a 5 channel amp for 4 speakers and a sub run via RCA. Can I also hook some speakers using the speaker wires from the radio harness?

    Buck Pomerantz from Crutchfield

    on 6/19/2020

    Joe, I can't see how your factory speaker wiring isn't already being used to run your speakers, so I doubt it can be used to run more speakers.
  • Michael from Ebensburg

    Posted on 6/13/2020

    Does the hpf, lpf, Xover, equalizers,fader and balance settings on the headunit still work when you cut the speaker wires to run an amp to the door speakers?

    Buck Pomerantz from Crutchfield

    on 6/15/2020

    Michael, All the receiver's features should continue to function, if you've connected it correctly.
  • Darin L Holland from YOUNGSTOWN

    Posted on 6/12/2020

    I have a new stereo, mtx amp, and 6 new speakers in my car. When I turn the volume up the speakers pop and crack. How do I fix that? Thanks

    Buck Pomerantz from Crutchfield

    on 6/15/2020

    Darin, It sounds like you've got a loose connection or a faulty receiver. If you bought your gear at Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • Randy Romero from Santa Clarita

    Posted on 6/12/2020

    So i am keeping my factory head unit but adding speaker to the front doors and rear deck. How would I connect them to an aftermarket amp while still having the factory amp

    Buck Pomerantz from Crutchfield

    on 6/15/2020

    Randy, In your case, I recommend using an aftermarket amp that can take very high-level inputs, like an AudioControl amplifier.
  • Jonathan Roberts from Grove City

    Posted on 6/11/2020

    I have a 1500 watt one channel amp that I am trying to connect my 4 door speakers to. I have two + and two - speaker connections on the amp. I was planning on attaching both front speakers to one set, and both rear speakers to the other set. Is this plan safe/prudent/possible?

    Buck Pomerantz from Crutchfield

    on 6/11/2020

    Jonathan, Most mono, 1-channel subwoofer amplifiers have 2 speaker output terminals that are wired together inside the amp. The second speaker output terminal is there for convenience and if you hook a speaker to each terminal it would result in the two speakers being wired in parallel, cutting the total impedance in half. Your plan is imprudent, unsafe, and would most likely result in a burnt amp and blown speakers. If you want to power 4 speakers, use a 4-channel amp.
  • Jose from Covington

    Posted on 6/7/2020

    I'm installing a 4 channel amp to the door speakers but I'm keeping factory head unit can I run the speaker cable rca adapter to the head unit wires or to the speaker wires going to the amp??

    Buck Pomerantz from Crutchfield

    on 6/9/2020

    Jose, If I understand your question correctly, you can install that adapter either behind the radio or at the amplifier.
  • Cory from Dubuque

    Posted on 5/30/2020

    How do you do that if you have a factory amplifier in your car?

    Buck Pomerantz from Crutchfield

    on 6/1/2020

    Cory, You use an amplifier that has high-level inputs or use a line output converter (LOC) to integrate with the factory system.
  • Anthony from Miami

    Posted on 5/21/2020

    I purchased a Skar RP600-5 amp to power 4 new RF 6x9's and the 5th monoblock channel to power a Kicker CompRT10 1ohm. Im keeping factory head unit so will run speaker wire to amp via speaker to rca inputs however I'm puzzled with what do I use as an input for the 5th channel dedicated to my sub. Also do you guys have a output converter that might make my install easier ?

    Buck Pomerantz from Crutchfield

    on 5/22/2020

    Anthony, It sounds like a good line output converter is exactly what you need. Crutchfield carries a few, so give us a call and an Advisor will help you pick out the one that'll work best for you.
  • Ricky Buchanan JR from Manhattan KS

    Posted on 5/18/2020

    When you use the EFX 9wire ultra flex to tap into the factory head unit Speaker outputs, where do you plug the 9wire into the amp As inputs? Is there an rca adapter that you connect the 9wire speaker inputs to in order to connect to the amplifiers RCA inputs?

    Buck Pomerantz from Crutchfield

    on 5/18/2020

    Ricky, Either the amp will have speaker wire input harness connections or you'll use a speaker wire to RCA adapter.
  • Bradley Wayne Bellew from Texarkana

    Posted on 5/16/2020

    I have got my wires ran and everything but nothing but my speakers. I have no rca to hook up to on my radio so if I run rca to an aux chord to plug in my phone, where and what do I use to get the speakers going I have remote going from rmt to positive and i have 2 rca coming from input bit kow what about high?

    Buck Pomerantz from Crutchfield

    on 5/18/2020

    Bradley, If you bought your amp or speakers at Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • Mike from Philadelphia

    Posted on 5/9/2020

    Can I run 2 kicker amps off of 1 set of high level inputs?

    Buck Pomerantz from Crutchfield

    on 5/11/2020

    Mike, I can't say for sure without knowing precisely which amps you're referring to. Some amps have preamp outputs which you'd use to feed the second amp's inputs.
  • Charles L from Country Club Hills

    Posted on 5/4/2020

    Hi, I just install DDX26BT in my 2008 Chevy Tahoe with the Bose System, but now I only have front speakers and very little from the back. I also try the balance the speakers seem to off balance. Should I just run new wire for the speakers and bypass the factory amplifier

    Buck Pomerantz from Crutchfield

    on 5/6/2020

    Charles, Perhaps the rear seat audio control volume has been turned down. Or you didn't use the correct integration adapter for your installation. If you bought your receiver at Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • efrain cruz from toa baja

    Posted on 4/29/2020

    Hello i have a 2018 kia rio quinto and I installed a full sistem with a KENWOOD DDX26BT with 22 rms/50 max and 4 Kenwood KFC-1665S 30rms/300wmax and a audiopipe subwoofer of 800w all conected with a Autotek Super Sport Amplifier 3500 Watt With 4 Channel and i use 16 gauge with insulation and the amp is getting in protected mode out of nothing too much for the amp or should i look for something else is sometime give alot of heat any ideas....?

    Buck Pomerantz from Crutchfield

    on 5/4/2020

    Efrain, It sounds like you amp is wired to too many speakers and is seeing loads too small to handle.
  • Victor from Warrenton

    Posted on 4/23/2020

    I have a 2017 Suburban and I am upgrading all speakers with JL Audio C7 series. Each speaker will be running between 100 - 125 RMS per channel. Do I have to run new speaker wires? if so, do I have to leave the factory speaker plug disconnected (being that it's a smaller wire) or can I include it in a Y harness such as, new wire from speaker to factory speaker plug and amp. Also, Is it OK to use the factory speaker signals to connect a DSP or do I have to run all new wiring for that as well? Thanks

    Buck Pomerantz from Crutchfield

    on 4/24/2020

    Victor, With that much power it's best to run new speaker wires from your amp to each speaker. You'll want to disconnect the thin factory speaker wires from either the radio plug or from each speaker itself. If your DSP can take speaker-level inputs, you can use factory speaker wiring for signal.
  • Garick Mapson from Owings Mills, MD

    Posted on 4/16/2020

    I have a 2013 VW CC. I am looking to add an additional sub/amp to the existing system. Should I splice speaker signals before or after factory amplifier to run to the amp? Thank you,

    Buck Pomerantz from Crutchfield

    on 4/18/2020

    Garick, Generally speaking, you should use the low-level input signals for your sub amp's inputs.
  • Todd Rishel from Stuart

    Posted on 3/19/2020

    I have the WRA i209 Alpine with the alpine 65 series speakers. And as part of a kit came with a Kicker amp. I would like to tie into factory speaker harness behind head unit. Is there a plug and play adapter for this. Thanks. Todd

    Buck Pomerantz from Crutchfield

    on 3/24/2020

    Todd, Like this article shows, you have to hand-wire to the vehicle's harness.
  • Antwon Jarrett from WEST PALM BEACH

    Posted on 3/11/2020

    Hello, I have a 2010 altima 2.5 without the bose system after doing some research..these cars dont come with factory amps or do they?? If they dont come with a factory amp how do I wire the 4 channel amp for my mids and highs

    Buck Pomerantz from Crutchfield

    on 3/16/2020

    Antwon, Check out this article that shows one way to connect an amp into a factory system.
  • Ken F from Seneca

    Posted on 3/11/2020

    Have an 06 Honda Accord Ex Coupe that i'm installing a Kicker 700.5 amp and a sub as well as a new head unit. All 4 speakers have been upgraded to kicker. The 2 rear speakers are mounted where the factory speakers were, on the rear deck in the trunk and easily accessible. I'm installing the amp on the back of the rear seat, near the 2 rear speakers. I can power the rear speakers directly from amp with new speaker wire. That would free up the 2 factory speaker wires that powered the rear speakers. To save time of running 2 sets of wires from amp to speaker wire harness behind head unit, can I use the those 2 factory wires and connect one end to amp output and wire the other end to the speaker wire harness behind head unit to power the front speakers?

    Buck Pomerantz from Crutchfield

    on 3/11/2020

    Ken, Yes I think you can. Don't forget to disconnect the receiver's speaker output wiring.
  • Chris from Evansville

    Posted on 3/9/2020

    I bought the Kenwood excelon 500.1 mono and another La Power Sound amp 300x2. I have one LOC behind my Clarion Nx501. I have Scosche rca splinters turning my 2 rca ports into 4 rca ports. Hypothetical is this dividing my stereo signal of 5v between the 4 ports or would it send 5v out all four? Also when I plug in only the red or white rca cable to the la sound which handles my 6x9s I get sound out of my front highs and back speakers and when both rcas are plugged in it only plays out of the speakers wired into the amp. Part 2 Do you guys sell any harnesses for the discontinued Nx501 because it hard for me to want to give it up considering pros and cons vs cost of a head unit with its features.

  • Eric Proffitt from Glen Allen

    Posted on 3/8/2020

    2018 F-150 Lariat. Base Sony, Not B&O. Planning on running amp to door speakers. Components in the front, mid base in the rear. Was planning on using an LCI7, but can't quite figure out if that is what I need, any suggestions? How do I run a sub when I don't have one currently. My stock system has no sub, no amp. My goal is to replace all stock speakers, add an amp, keep the stock head unit.

  • Keith Meadows from EAST ORANGE

    Posted on 2/1/2020

    Hi I have a 2012 Honda CRZ that I put a kenwood receiver in and new speakers. Pioneer speakers. When I close my door or hit a bump my speakers on the passenger side goes out which causes the other side to go out. My sub and rear speaker stay on. my amp is the oem amp and someone told me that it could be the amp and it cant handle the speaker power. Is this true? Can you help?

    Buck Pomerantz from Crutchfield

    on 2/3/2020

    Keith, Power comes from the amplifier, not the speaker. So a speaker can't hurt an amp, but an amp can sure harm a speaker. When something in a sound system changes when you close the door or hit a bump in the road, it means there're loose wiring connections somewhere.
  • Charles T Nichols from Macedon, NY

    Posted on 12/27/2019

    Hi, I just installed my Sony head unit and wiring harness from you. 2005 VW GTI. The problem I am having is that the amp powering a rear sub will not power up. The amp for the sub is wired into the rear speakers. 12 watts at the peer wire on the amp. Where the remote wire was wired does not have power anymore. If I rewire the remote wire will it then tell the amp to turn on? Or do I need to run rca cables from the back of the head unit? And also a new remote turn on wire? Thank You for your help! Chuck Nichols

    Buck Pomerantz from Crutchfield

    on 12/28/2019

    Charles, Your aftermarket receiver has a remote turn-on connection that should go to the amp. It probably also has RCA outputs for a sub. If you bought your receiver from Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice.
  • Justin feliciano from Chicago

    Posted on 12/18/2019

    I have Lc2i installed with subwoofers set up. The lc2i shows diagram if I want to run extra amp from the 4 door speakers I have. I'm unsure on how to install second amp because I'm using two door speakers already to get signal to LC2i I don't have a step bi step directions sheet. I also believe my 2015 durango has factory amp. Will it be possible to use signal from wires behind radio still or will I have to install the amp and install each pair of wires to separate speakers?

  • David

    Posted on 12/5/2019

    What about when installing component speakers? I am using JL crossovers, so it has 2 pairs of wires, 1 pair for woofer and 1 pair for tweeter. If I want to use factory wiring harness, then do I install both pairs of wires from the crossover into the single pair in adapter harness being stereo?

    Buck Pomerantz from Crutchfield

    on 12/9/2019

    David, In the case of component systems, you can use the factory wiring up to the crossover inputs. Then you'll need to run new speaker wires from the crossovers to each tweeter and woofer.
  • Scott from San Rafael

    Posted on 11/19/2019

    I took out my old radio..and am installing a new radio,..the old radio had wiring for "Left front com" and Right front com" along with the pos and neg of speakers...what is this extra com for? Should I terminate it and not use it? Thanks.

    Buck Pomerantz from Crutchfield

    on 11/22/2019

    Scott, It's hard to say what you've got without knowing what vehicle you have. If you bought your new radio from Crutchfield, you could call Tech Support for free help figuring it out. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.
  • John C... from Portland

    Posted on 10/30/2019

    Hi Buck, I recently purchased a Pioneer MVH-S310BT car stereo. My manual says that the Power amp is sold separately. Which Pioneer Power amp is best mated with this stereo ? Thanks !

    Buck Pomerantz from Crutchfield

    on 10/31/2019

    John, One of our top selling amps is Pioneer's GM-A6704.

    Posted on 9/28/2019

    Front dash (center speaker) most economical way to hook up to after market amp? An 8 channel processor is pretty expensive please tell me there is a cheaper way

  • Chris from Ingham

    Posted on 9/9/2019

    Hi just wired up 4 new Sony 3 way speakers to my car, Each pair of speakers has 2 different wires to connect up a white and black and a grey and black, I was wondering does it really matter that I used the white and black on the right side front door and the grey and black on the back right door like is their a specific colour for left and right side or it doesn't matter, I've got the negative and positive right but just wanted to know??

    Buck Pomerantz from Crutchfield

    on 9/9/2019

    Chris, Speakers don't come in left and right varieties - you can use either one on either side. Without knowing exactly what speakers you have, we can't help you with advice. If you want a question answered about a system, you must identify the gear by model numbers as well as brand names so we can get the right information to you.
  • Prentiss from Shelbyville

    Posted on 8/31/2019

    I have a 1998 Toyota Avalon xls I want to replace my factory amp is it a simple job?

    Buck Pomerantz from Crutchfield

    on 9/3/2019

    Prentiss, Nothing is simple or easy with car audio. Upgrading a factory system often runs into interface issues. Why don't you give us a call so an Advisor can help you find the right OEM interface devices that may be necessary in your situation.
  • James Thomason from Bowman

    Posted on 8/29/2019

    Just installed a kenwood system in my dodge ram quad cab had the infinity system in it there was no info on the dash speakers are the just left out with the new system

    Buck Pomerantz from Crutchfield

    on 9/3/2019

    James, Why don't you give us a call so an Advisor can help you fully qualify your vehicle and pick out the speakers that will fit
  • Michael J Beazley from FRANKLINVILLE

    Posted on 8/6/2019

    2 channel amp using factory wiring for 4 speakers. When I connect the speaker wires to the amp do I put all the left positive wires in the Left positive connection of amp and so on and so on.

    Buck Pomerantz from Crutchfield

    on 8/7/2019

    Michael, You can run four speakers with a 2-channel amp by connecting the left pair of speakers to the amp's left channel speaker terminals and the right pair of speakers to the right speaker terminals - two to a terminal. You will lose the stereo's front to rear fade function, though.
  • Shawn from Hawaii

    Posted on 8/3/2019

    Aloha I'm new to car audio and I needed some help if you don't mind. I want to run 2 amps one mono for the sub and a 4 channel for 6 speakers and deck. I was wondering what wiring and wiring kits do I need for everything to work

    Buck Pomerantz from Crutchfield

    on 8/6/2019

    Shawn, Give us a call so an Advisor can hook you up with everything you'll need.
  • Derrick E Anderson from Omaha

    Posted on 7/10/2019

    do the Honda factory radios have RCA outs to run sound from the radio back to the amp? I would then run the EFX9 back from the am to the radio speaker connector right?

    Buck Pomerantz from Crutchfield

    on 7/11/2019

    Derrick, No factory radio that I know of has RCA outputs. Check out this article for help in your situation.
  • Erin from Hastings

    Posted on 7/8/2019

    I have 06 gs300 that i just want to add a 4 channel amp and 2 12s too ithow do i do this

    Buck Pomerantz from Crutchfield

    on 7/9/2019

    Erin, Check out our Car amplifier installation guide for some guidance.
  • Quinton from Oceanside

    Posted on 6/24/2019

    I have a 2016 Honda Accord lx and i was wondering what after market speakers would work best with my stock stereo?

  • Clay T Nelson from Okolona

    Posted on 5/31/2019

    I have an old school Memphis audio 16-PR1KD monoblock amp (can't find the manual or wiring diagram for it anywhere online but says must be ATLEAST 1ohm or will damage amp) and a Pioneer 1000watt 2channel amp. I want to wire my door speakers (4), tweeters (2) and also MAYBE two 6x9s (if possible) to one amp (Ive installed new speaker wires from each door speaker to where my amps are, factory wire to short and not thick enough to use) and my two 10in subs to the other amp. What's the best way to do this (till i get bigger subs) and what are the wire diagrams for where each wire goes on each amp?

    Buck Pomerantz from Crutchfield

    on 6/3/2019

    Clay, I can't see how a 2-channel amplifier could power that many speakers. Perhaps checking out theseAmplifier wiring diagrams will help clarify things. Every speaker/driver should have a channel of amplification of its own.
  • Shawn from San jose

    Posted on 5/31/2019

    Can I hook my Boss "riot" monoblock amp(1100 w rms) up to my 2015 Nissan Altima factory stereo withought a loc to power one twelve inch kicker?

    Buck Pomerantz from Crutchfield

    on 6/3/2019

    Shawn, That amp features speaker-level inputs, so you won't need a separate line output converter.
  • Remon from Carlton

    Posted on 5/14/2019

    Hi, My car: Honda Accord Euro 2004 Luxury Sedan Auto (without Navigation) Front : Morel Maximus 602 6.5" 60w RMS (each) Back : Morel Maximo Ultra Coax 6x9" 100w RMS(each) Sub : PIONEER TS-WX130DA ## Want to buy MOREL MPS 4.400 AMP(70w RMS x 4) for powering front and back speaker My question is front speakers 60rms each and back 100 each . Is that ok to by that amp? because front speaker 60w and amp has 70w , can we take 10w from front amp and power it to back speaker cos back speaker 100w but amp only provide 70w. Hope I explain correctly.

    Buck Pomerantz from Crutchfield

    on 5/14/2019

    Remon, Speaker wattage ratings are more for what not to use for an amp than a power recommendation. You wouldn't want to power your 60-watts RMS rated speaker with a 100 watt amp. But that 70 watts RMS per channel amp will work fine. Just make sure you set the amp gain so no distortion plays. Amp channels are what they are - you can't redistribute the power among them.
  • Brian Van Ness from Dickinson

    Posted on 4/20/2019

    I am planning on buying a 2019/2020 Accord Touring Hybrid with the 10 speaker premium audio. I plan to replace the 8" sub with a unit from Crutchfield. My main concern is that the car has eight speakers in the front doors being two woofers and two tweeters and the rear deck has the same woofer/tweeter setup. I want to replace those speakers and add a 4-channel Audiocontrol 4.300 amp. With all that said how do I amplify the center dash speaker with the rest or do I need to?

    Buck Pomerantz from Crutchfield

    on 4/22/2019

    Brian, You could get a 5-channel amp and use the sub channel for your center speaker. Or get a small 1-channel amp. Or just leave the speaker connected to the factory radio.
  • Marcus Tucker from Duluth

    Posted on 4/19/2019

    Installed aftermarket speakers on door one of my 6×9 on rear is bl lowed now one speaker in door working off amd on when o hiy it

  • Aaron

    Posted on 4/18/2019

    I have a set of focal kx2 speakers that are 120W RMS per woofer, i want to install then in my 2011 Jetta SE, so I definitely cant use the factory wiring. How do I feed my speaker through the door with the door wire harness in the way?

    Buck Pomerantz from Crutchfield

    on 4/19/2019

    Aaron, If you're not installing a high-power amplifier, your speakers will work fine with factory wiring. If you're going to use an amp with over 75 watts RMS per channel, then it may be better to go ahead and run new 14- or 16-gauge speaker wires directly from the amp to each speaker. Yes, it is a challenge running new wire through door fittings. If you get stumped, you could probably find an installer in your area who could do it for you.
  • Samuel from Grand prairie

    Posted on 4/2/2019

    I berly connect a amplifier to my factory speakers it's A 1000 xd jl audio . Would I have to upgrade on factory speakers ? Would I burn my factory speakers ?

    Buck Pomerantz from Crutchfield

    on 4/5/2019

    Samuel, As long as you don't push the volume so high that the speakers distort, the factory speakers will be okay. Aftermarket speakers would sound better, though.
  • Johnbass from Georgetown

    Posted on 3/30/2019

    I have a Toyota Corolla 2012, and which having a factory fitted normal toyota sound system. I wish to buy 12 inch 2000w Kenwood subwoofer with box. My question is, can I connect one rear speaker line to the subwoofer, while contacting it to the normal speaker too. This subwoofer, doesnt have inbuilt amp. Thank you.

    Buck Pomerantz from Crutchfield

    on 4/1/2019

    John, A subwoofer needs an amplifier to work. You can get your sub amp's input signal from the rear speakers while leaving them connected to the radio. But the radio doesn't have enough power to drive a sub.
  • Javier from Orange County

    Posted on 3/19/2019

    Hello, Wanted to ask if there's an adapter I can buy to attach to a 4 channel amp to power my door speakers (total of 6) using the same factory wires already in place. They are currently powered by the factory amp on my lexus gs350. I have 2 12" sundown ported with two 1200 1D fosgate amps and I nee de my mods and highs to step it up. Is there such thing as an adapter I can adapt to the adapter that goes into the factory amp and use for my new amp?

    Buck Pomerantz from Crutchfield

    on 3/22/2019

    Javier, I think you're looking for a line output converter. You take the high-level signal from the factory amp's output harness wiring and the converter lowers it to line level, which your aftermarket amp can handle.
  • Nick D from Edna

    Posted on 3/18/2019

    I have a 4 channel 1000 w amp and I wanted to know if it's safe to have 3 tweeters and a door speaker wired to on channel? The other channel has the same speakers wired together that's 3rd and 4th channel for the front left and right. 1 and 2 I have just one door speaker left and right rear wired to the amp

    Buck Pomerantz from Crutchfield

    on 3/18/2019

    Nick, I don't think it's safe to wire three tweeters and a speaker to one amp channel. But without knowing precisely what speakers, amp, and subs you're referring to, we can't really help you with advice. If you want a question answered about a system, you must identify the gear by brand names and model numbers so we can get the right information to you.
  • Chris Cottrell from San Antonio

    Posted on 3/6/2019

    Ok I have a quick question that I seem to find an answer to. If anyone could please give me an honest answer I would greatly appreciate it. If you answered my question or leave a response I would like to thank you now first. Now to business. I own a 2008 Chevy Malibu classic model LS. It came with a 4 speaker factory system. I have replaced the original head unit with a pioneer avh-3300NEX. I installed a pioneer gm-8601 to push 2 12"pioneer subs which are ran with rca inputs. I replaced factory speakers with pioneer 6.5 front door coaxial and 6x9 coaxial speakers rear deck. Now here is the part I am having trouble with I purchased a car like mine but an LT model which had a 6 speaker system installed, I took the part that covers the side mirrors which had a tweeter and replaced the tweeter and tied it into the front speaker wires. Now I just installed a gm-1004 and ran new speaker wires to the four original speakers I connected the rca inputs to front and rear accordingly. I left the two factory front speaker wires from the head unit connected also and have those connected to the tweeter only. Is that not ok to do???!! How should I do it if that is the improper way to do it? I only don't want to connect it because I am thinking I will over power the tweeter and also don't want to take away from the front 6.5's. Again your advice is greatly appreciated. Have a great day!!!

    Buck Pomerantz from Crutchfield

    on 3/7/2019

    Chris, If you're asking if you can power your tweeters with the head unit while powering the other speakers with an amp, the answer is yes you can.
  • William from Georgetown

    Posted on 1/10/2019

    My 2019 Grand Cherokee has a 9 speaker Alpine amplified system. I believe the connections for my speakers go from the head unit, to the amp, then to my speakers. To run an amplifier I would need to catch the speaker wire after the stock amp to cut it off, correct? So I can't use the internal speaker wire from the head unit

    Buck Pomerantz from Crutchfield

    on 1/10/2019

    William, The radio in your vehicle sends digital data to the amp in addition to audio signal, so warning chimes and other audio features do the right thing. To maintain all functions, getting the signal from the factory amp's outputs for your replacement amp's inputs is a good way to go. Just be aware that that factory amp has crossovers built in, so some of the outputs are for tweeters, some for midrange woofers, and some for subwoofers. Another strategy would be to use a vehicle-specific amp replacement module and harness to install a new amplifier in your Grand Cherokee.
  • Brennan from Richmond

    Posted on 12/20/2018

    I have focal ps165's that Im going to bi-amp actively with a 4 channel amp at 75 rms per. I have a 2001 Subaru forester. My question is do I need to run new thicker gauge speaker wire or will I be fine with the factory wires? Ive been finding mixed responses on the web. Sound quality is really important to me but I only want to replace the wires if it's really necessary.

    Buck Pomerantz from Crutchfield

    on 12/27/2018

    Brennan, You'll be fine using factory wiring. Sound quality is not affected by speaker wire size. You'd only need to use thicker wire when sending high power, 100+ watts, to your speakers.
  • Michael from Minneapolis

    Posted on 11/1/2018

    So if I wanted to run new wire to my speakers (4) off my 4-channel amp, would I then remove all of the speaker wires off my aftermarket head unit's wiring harness (it appears that was done in the picture)? Do I simply pull them out? Any issues with just taping them off (other than the usual warnings of tape potentially falling off) or just capping them? Should I remove those same speaker wires off the Metra kit that's plugging into my existing Toyota factory wiring (as I still want all the basic power and what not factory wire connections to use)?

    Buck Pomerantz from Crutchfield

    on 11/5/2018

    Michael, If you run new speaker wires directly from your amplifier to each speaker, you will need to disconnect the factory speaker wiring from each speaker. You can do that at each speaker's location or at the radio harness. If you cut a wire, it should get capped off with a crimp or heat shrink so no short circuits can occur.
  • Chris from Los Angeles

    Posted on 6/28/2018

    So a 5 channel amp like the one pictured in the article , has 1 rca input for each channel, except for the subwoofer input. That 5th channel has a sub positive and sub negative input. If A single RCA cable has both the positive and negative polarity why is the sub input handled in such a way, and how do I go about wiring my setup which has the following. (2) SUB out rca jacks from the receiver. Two sub input rca on the amplifier. And I'm using two 8 ohm subs that will be wired together to get a 4 ohm final. Thanks,

    Buck Pomerantz from Crutchfield

    on 6/28/2018

    Chris, Your receiver has left and right front, left and right rear, and left and right subwoofer outputs. Your amplifier has left and right subwoofer inputs that are summed, blended together electronically, in the amp's input circuitry. Use both, otherwise signal strength will be too low.
  • Buck Pomerantz from Crutchfield

    Posted on 5/6/2018

    Anthoneal, Your aftermarket receiver came with a plug/harness. You say you also have the harness that goes with your vehicle (the one that plugs into the factory radio harness). Those two harnesses, the radio and the vehicle-specific one, get wired together, usually similar colors to each other. The instructions in the receiver's owner's manual will show how it's supposed to get connected. You shouldn't ever have to cut factory wiring.

  • anthoneal zephyr from port of spain

    Posted on 5/6/2018

    I have an after market head unit that came with the harness connector for my Nissan car which harness am I connecting the amp to without cutting the factory wiring

  • Buck Pomerantz from Crutchfield

    Posted on 4/24/2018

    Tyler, I don't think so. But I may be misunderstanding. A 2-channel amplifier is usually used to power just two speakers or one subwoofer.

  • Tyler Lockwood from Heber Springs

    Posted on 4/22/2018

    I have a 1800 watt 2channel amp and a 1800 12 inch subwoofer. Can I also run my door speakers all on this one amp using the output wire harness coming off the the amp and other for sub?

  • Buck Pomerantz from Crutchfield

    Posted on 4/10/2018

    Joshua, You can use a couple of RCA Y-cords to get your 2-channel amp's input from the LOC's RCA outputs

  • Joshua from Sydney

    Posted on 4/8/2018

    Hi, I have a 2010 bmw 325i . I have already upgraded the front door and under seat subs/mids with the alpine upgrade kit. What I want to do is amplify the rear speakers and add a sub in the trunk.. i have already cut and used the rear speaker wires and hooked it up to a 2 channel loc. i am using that loc with a monoblock amp to run a sub, which I successfully have. I have a separate 2 channel amp that I want to use to amplify the rear speakers.. how do I do that? Cheers

  • Buck Pomerantz from Crutchfield

    Posted on 3/12/2018

    Andrew, This method of wiring doesn't bypass the vehicle's harness, it taps into it, using the speaker wires for your amplifier's output, and the power and ground wires to power an aftermarket receiver. The vehicle harness is the lower right plug in the illustration.

  • Buck Pomerantz from Crutchfield

    Posted on 3/12/2018

    Aaron, If your amp doesn't have a source switch for its sub channel, you'll have to tap four more wires from the existing eight speaker wires you've tapped into. In other words, you make Y-cords of speaker wire, getting four high-level inputs from two speaker wire pairs.

  • Buck Pomerantz from Crutchfield

    Posted on 3/12/2018

    Dylan, In order to run 6 speakers with a single 4-channel amp will require two pairs of them to be wired together in parallel, positive lead to positive and negative to negative. So, two of the amp's channels will drive two speakers while the other pair of channels drive four speakers.

  • Andrew

    Posted on 3/12/2018

    You can completely bypass the OEM harness, correct? Just trying to clarify for myself, been out of the audio game for a while, and looking to do a completely custom install. I appreciate the input

  • Aaron from Irondequoit

    Posted on 3/11/2018

    Very helpful article, thank you. You guys are a great information source. I do have a question about this however. I have a 5 channel amp and want to run my four door speakers and a sub. So I run the 8 wires from the factory harness to the amps high level input. That will provide source for my 4 door speakers. But what about a source signal for the 5th channel, my subs? Just Incase it's pertinent, I'm in an 08 avalanche with non Bose equipment.

  • Dylan Goins from Athens

    Posted on 3/9/2018

    I would like to know how to wire 6 speakers to a 4 channel amplifier. I am using a Pioneer GM-D8604 with 3 sets of Pioneer TS-A1606C speakers in a 98 Camaro. Thank you!

  • Buck Pomerantz from Crutchfield

    Posted on 2/16/2018

    Cori, Check our Car amplifier installation guide and our How to install a car amplifier video. Both should provide guidance for what you want to accomplish.

  • Cori from valdez

    Posted on 2/13/2018

    I have a panasonic model CQ-C5305U in my truck with 4 speakers,2 in front doors,2 in rear doors, also 2 pioneer subs and want to hook all this together with my alpine MRP-F300 how do i do this step by step , visuals would be much appreciated thanks

  • Buck Pomerantz from Crutchfield

    Posted on 12/15/2017

    David, Check out How to connect an amp to a factory stereo for help with what you want to do.

  • David

    Posted on 12/15/2017

    How would I apply this to a factory radio? I want to install an amp to power door speakers, I will not be getting an after market radio. What all do I need?

  • Buck Pomerantz from Crutchfield

    Posted on 9/8/2017

    Randy, According to Crutchfield's database, replacing the factory receiver means losing the navigation and satellite radio features of your vehicle. You'll get a better idea of what's involved and what solutions are available by talking with an Advisor. Give us a call.

  • Randy from Morehead City

    Posted on 9/7/2017

    Hello, Any suggestions on wiring in a new head unit in a Hundai Santa Fe 2009 with NAV? The amp powers 10 speakers. I have seen different head units with different numbers of pre amp outputs, which or how many outputs would I need? I know this is an easy question but in-car amps were before my time and experience. Thanks.

  • Buck Pomerantz from Crutchfield

    Posted on 9/5/2017

    Joseph, It depends on your specific vehicle. When you replace the receiver and factory amplifier in some vehicles, you lose features like warning chimes, navigation prompts, and steering wheel controls, unless you employ a vehicle-specific digital interface device along with the factory amplifier left connected. If your vehicle doesn't have those kinds of features, or you don't mind losing them, then you can go ahead and remove the factory amp.

  • Buck Pomerantz from Crutchfield

    Posted on 9/5/2017

    Ashay, If the signal doesn't clip when your line output converter's gains are set to maximum, so be it - there's no problem. Again, using a voltmeter to set gain at 1000 Hz won't be accurate. Use your ears. The thickness of the speaker wires going to your tweeters will have nothing to do with their volume and tone. Use the tone controls of your receiver for that.

  • Joseph Horvath from knoxville

    Posted on 9/3/2017

    I am using a multiple channel aftermarket head unit, external 4 channel amplifier, and running all new speaker wires to all 4 locations in a vehicle that came with a factory amp. Since i wont be using any of the factory wiring or amplifier, can you remove the factory amp completely from the vehicle? or does the amp need to remain powered for the cars computer to run properly? thanks

  • Ashay Borkar from India,Goa

    Posted on 9/1/2017

    I had used your method of tuning using test tones .The buzz is noticed first in 1000hz tone . Will it be better if I tune the rca's(Out from scosche 4 channel LOC) using lower hz test tone say 50hz and use the 1000hz for setting gain of amp? Also when I had tried tuning the LOC using 1000hz there seemed to be no buzzing noticed even at highest gain on the LOC ! Is it ok to set it to full?(Being conservative I used the test tone to set it to 1V each channel) Also last question does wiring tweeters with lower gauge and wiring woofers using factory wires effect the sound ?

  • Buck Pomerantz from Crutchfield

    Posted on 8/31/2017

    Ashay, Your method of using your multimeter to measure signal strength is correct, but most multimeters only accurately measure AC voltages around 50 or 60 Hz. I don't think your reading at 1000 Hz will be very accurate, so don't depend on that for setting gain. Your ears are more accurate. If the components' crossovers don't have a control that lets you turn down the tweeter volume, then you'll have to tune them from the receiver's tone or EQ controls.

  • Buck Pomerantz from Crutchfield

    Posted on 8/31/2017

    Delisia, The 9-conductor cable, as described in this article, connects to the vehicle wiring harness behind the factory radio. You can purchase instructions on how to remove your radio from Crutchfield at this link.

  • Ashay Borkar from India , Goa

    Posted on 8/27/2017

    Hello Buck, I have a set of focal components speakers powered by a 4 channel amplifier which is bridged to a jbl sub! Source - factory unit connected to scosche hi low converter . I have used new speaker wires(16awg) for tweeters and have used the existing factory wires for the component woofers ! My problem is the tweeters tend to have more volume then the woofers making the sound too much bright ! Is this because of the wiring difference ? I also checked the voltage out of the amp and they start distorting at roughly 10 v (so 10*10/4=25w) measured by multimeter at 1000hz test tone!is this because of the wiring or the source itself is not processing sound better ?Also isn't 25 watts too low to make the sound distorted ?speakers and amp are rated at 65w @ 4 ohms RMS! I have set the Loc to give 1v voltage to the RCA (each channel) running to the amp!i have also tested for phasing issues but the wires are not connected wrongly (can the tweeters be out of phase with the woofers?) ! Please help me trouble shoot and tell whether my method of using multimeter is correct !

  • Delisia from Ventura

    Posted on 8/24/2017

    I got a 97 Civic ex I have a pdx-v9 and I want to hook inside speakers to the amp I'm not sure where I hook my 9 conductor wire up at?

  • Buck Pomerantz from Crutchfield

    Posted on 8/7/2017

    Justin, If your receiver checks out okay you should check all the wiring and the amplifier. Maybe the store you got your receiver can troubleshoot and repair your setup.

  • Justin Chan from Port of Spain Trinid

    Posted on 8/3/2017

    Hi i recently bought a Pioneer DEH model car stereo. I hooked up a phoenix gold 4ch amplifier to it but sadly I am not getting any signal from it. Only a humming sound from each channel. When i switch sources on my car stereo I could hear the humming sound glitching. I carried it back to the store i bought it from and they said the car stereo is working pretty fine. What you think cud possibly be the issue?

  • Buck Pomerantz from Crutchfield

    Posted on 7/27/2017

    Jason, If you don't want to connect to the factory wiring behind your stereo, you'll have to run new speaker wires from your amplifier's outputs to each speaker. Not knowing what receiver you have makes it difficult to address your concern about patch cables. Some receivers have three sets of outputs, some only two. If yours has two - front and rear/sub - you have two wiring options. Set the receiver's output setting to sub, run two sets of RCA cables from the receiver, and use a Y-cord at the amp to get two sets of input signals plus the sub's signal. You can control the sub from the receiver but you lose its front-to-rear fade feature. Otherwise, set the receiver to output the rear, use two patch cord pairs for the 4 channel inputs, and either get the sub channel signal via Y-cord from the rear channels or the amp has an onboard feature that gets the sub's signal internally. And the only convenient way to adjust the sub's volume would be by a wired remote, if the amp had one.

  • Jason from Brookings

    Posted on 7/26/2017

    Hey Buck! I have wired many subwoofers to monoblock amplifiers, but I have never touched a 5 channel amp before. I am ordering a 5 channel amp soon to step my game up and I am trying to figure out how to wire it correctly! I have watched many videos and read many articles on how to wire a 5 channel amp but still have confusion with two things. One, am I to run speaker wire directly from my door speakers and rear 6x9's to my amp? I don't mind the extra work of running wires if that's the case. I would like to avoid doing any work behind the stereo, for there isn't much room to work with. And two, am I suppose to have another pair of RCA's for the regular speakers? Like I had said, I have done many monoblock hook ups, but never a 5 channel. In the videos I had seen, there were two or sometimes three pairs. If I recall, there is another pair of inputs on the back of the stereo and I would assume that's where they go if I need another pair. Much thanks!

  • Buck Pomerantz from Crutchfield

    Posted on 7/18/2017

    Tee, Sending 100 or more watts RMS through 18-gauge wire won't set anything on fire, but the full power won't arrive at the speakers due to voltage-loss along the way due to the wire's relatively high resistance.

  • Tee from Santa Ana

    Posted on 7/17/2017

    Will my speakers or cables fry if I went over what the wire can handle, as in over 75 watts RMS per channel? I'm also thinking about adding tweeters to each channel. If my speakers are 4ohm and I add 4ohm tweeters by tapping into the main speakers, will my amp see that channel as 2ohm?

  • Buck Pomerantz from Crutchfield

    Posted on 7/5/2017

    Phil, You should listen to your Crutchfield Advisor - she is absolutely correct. In a system with a factory amplifier, you should not cut into the harness at all or you will lose most of the control functions of the stereo as well as any factory audio features like Bluetooth calling, navigation prompts, and warning chimes. Your car's computer sends a digital data control signal to the factory amplifier which is necessary for normal operation. To add an aftermarket amplifier in your vehicle, use the factory amplifier's outputs for your AudioControl LC7i's inputs. In other words, use the factory amplifier's output harness instead of the radio's. Then you can run new speaker wire to each speaker and disconnect the factory wiring there, or run 9-conductor from your aftermarket amplifier's outputs to the factory speaker wiring at the factory amp's output harness.

  • Phil from dc

    Posted on 7/4/2017

    I called Crutchfield and a lady said I cannot just cut the harness on my 2017 crv because it has a factory amplifier. So I need a wire post-amp to run to a aftermarket amp via LC7I then to RCA then the outputs of the after market amp wire back to the speakers directly, is this true? I was thinking I can just cut the harness behind the factory head unit, put 9 cable there coming out of the factory head unit then to a LC7i then on the other end of the factor cut harness, run 9 cable again from the aftermarket amp output. Does this sound right? So really I'm cutting the harness in half and adding a lc7i and an amp. But the lady said it has to be post-amp signal going to the lc7i because it could be data or something. Please help before I buy

  • Buck Pomerantz from Crutchfield

    Posted on 6/7/2017

    Caleb, If you bought your gear at Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number would be on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Caleb from Conway

    Posted on 6/5/2017

    I utilized a 9 wire speed cable in order to connect my door speakers to an amplifier. I have everything wired up, however the rear door speakers do not work. Thinking the speakers may be blown, I bought new ones and installed them. Still nothing. The front door speakers work fine and the dash speakers work fine. Help!

  • Buck Pomerantz from Crutchfield

    Posted on 6/5/2017

    Josh, Kicker's DXA125.2 can send 30 watts RMS out each channel to regular 4-ohm speakers, and 60 watts RMS each to 2-ohm speakers. Although you've described how your amps' power and input signals are run, it's not at all clear how the amp's outputs are wired to your speakers. You need to either run new speaker wire to each speaker and disconnect the factory wiring, or run speaker wire up behind the receiver and use the factory wiring at the vehicle harness (also disconnecting the part running to the receiver's output). This 5-conductor wire would work well in your situation. If you bought your amplifier at Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Josh from Winchester

    Posted on 6/5/2017

    Hello here is my situation! I just purchased and installed a kicker dxa125.2 channel 250 watt amp into my car. My current setup is 2 fosgate 12s with a fosgate power t500 1bd amp... I am wanting to use the kicker amp for my front and rear door speakers.... My problems is I have ran all the power wires with distributor and grounded each of my amps individually? and spliced into my remote wire.. and I ran my RCA's from.back of head unit to my main amp the fosgate t500 then ran another set of RCA's from the output into the input of my new kicker amp... I have power and everything to my new amp but it's not making any difference in the sound quality of my system... It's like I installed this new kicker amp for nothing cause it's not making my front and rear door speaker sound any better???? Do I need the 9 conductor wire?? I thought Daisy chain the new amp would control my all my door speakers but it hasn't done anything at all.... Plz help!

  • Buck Pomerantz from Crutchfield

    Posted on 5/30/2017

    Laz, That amplifier has an input select switch, by the subwoofer channel controls, that lets the sub channel get its input from the Ch A/B input or a separate subwoofer channel of the receiver. You'll want to set it to the Ch A/B setting.

  • Laz from Chicago

    Posted on 5/29/2017

    Hi, I bought stuff from you guys before for both home and auto and you're the best when it comes to educating and empowering your customers. Here's my issue: I want to add a 5 channel Pioneer GM-D9605 Gm Digital Series Class D Amp to my head unit and add a sub to my existing front and rear speaker set up.. Okay, so after running front and rear speaker outputs from the head unit to amp's speaker input terminals, what do I do about the amp's sub input since I have no outputs from the head unit?

  • Buck Pomerantz from Crutchfield

    Posted on 3/9/2017

    Troy, You can leave the harness alone, for just the reasons you mention. You will disconnect the factory speaker wires at the speakers, whether unplugging them or by cutting the wires. Just be sure to tape off any exposed conductors so they can't short by touching anything metal.

  • Troy

    Posted on 3/8/2017

    The article recommends running separate speaker wire from the amp to the speakers if exceeding 75watts RMS. I understand the hook up procedure for this. My question is...when you connect your speakers directly to your amp instead of splicing through the wiring harness, can you LEAVE the harness connections alone or do you have to physically cut the speaker wires? I'm going to be installing a new radio soon and speakers. I will connect all through the harness. When I add an amp, I want to wire the speakers from the amp. So just wondering if I can leave the harness speaker connections alone if I do that. This way I can go back to stock components if I ever want to. Thanks. Hope this all makes sense.

  • Buck Pomerantz from Crutchfield

    Posted on 2/24/2017

    Calvin, Amplifiers that can be strapped together in order to double the available power use proprietary connections that are different from the way most amps are wired. Each amp manufacturer does it differently - some use interconnecting cables, some use switches. The only way you can tell if your amps can be strapped together and how to wire them is by referring to their instruction manual.

  • Calvin

    Posted on 2/23/2017

    What is the correct speaker wiring pattern of wiring two amps that are strapped together?

  • Buck Pomerantz from Crutchfield

    Posted on 2/14/2017

    Nunzio, This method of connection can be done in almost any system without a factory amplifier.

  • Nunzio

    Posted on 2/13/2017

    Hi, Can this be done to a 2016 Chevrolet Silverado Double Cab without Bose system; With 8" LCD Radio, by adding a Amp and using the existing speaker harness running to all four doors ?

  • Buck Pomerantz from Crutchfield

    Posted on 1/27/2017

    Rogelio, If you bought your gear from Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number is on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Rogelio Montalvo from Harker Heights

    Posted on 1/24/2017

    I chose to use the 9 wire connector but my front speakers are not working. My 9 wire connector is running from the amp directly to the vehicle harness. Do I need to do something different since I connected a pair of Kicker 40CSS694 6X9 component speaker system? All speakers are using the factory wiring connection at each door for all of my speakers. The rear speakers are working to include my subwoofer. I am at a lost..........

  • Dahita from Reston, VA

    Posted on 12/19/2016

    Thank you very much for your answer

  • Buck Pomerantz from Crutchfield

    Posted on 12/19/2016

    Dahita, A list of what may be wrong is long, starting with the fact that two inputs shouldn't get connected together (if that's what you have). If you bought any of your gear from Crutchfield, you could call Tech Support for free help troubleshooting your system. Their toll-free number would be on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Dahita from Reston, VA

    Posted on 12/18/2016

    Hello, Thank you very much for your article. I am struggling to get the factory amp working with the PAC RPK5 GM4101 and a Pioneer 4200; the sound comes out of all speakers but it sounds like it's not amplified (sound distorts at mid level). Yet the blue/white cable is plugged correctly, so I'm assuming the amp is on. The one thing I'm puzzled about is that there are 2 RCA cables labeled "Aux In" coming out of the main harness (big black plug); I connected them to the Aux input of my stereo but it makes no sense as it is already connected for Aux In with a Jack that works fine. Could these RCA be the ones you mention to connect to the stereo's speaker wires? like front or rear RCA from the stereo? Would this make my sound amplified again?

  • Buck Pomerantz from Crutchfield

    Posted on 11/28/2016

    David, Not knowing exactly what subwoofers you have make it impossible to give advice on how to wire them together. JL Audio makes 2-ohm and 4-ohm loaded sub enclosures. If you want a question answered about your system, you must identify your equipment by model number as well as brand name

  • David from Muskegon

    Posted on 11/24/2016

    I have a Memphis(mono block) amp 16-ST500D which can be made 2ohms min and I have two boxes with a 12" JL Audio in each. Could you show me a diagram to properly wire them for one box installation and also for two box installation. Thx

  • Buck Pomerantz from Crutchfield

    Posted on 11/11/2016

    Jason, I don't see why not. If you use the method described here, using the factory wiring for the four main speakers, you could take the left and right front speaker wires from the radio harness and splice on new speaker wires for your new tweeters.

  • Jason from Atlanta

    Posted on 11/11/2016

    I'm my truck I have 2 tweeters and four 6.5 coaxial speakers in the doors. Can I wire the four 6.5 speakers to a 4 channel amp and the 2 tweeters to the head unit? I have JVC 212bt head unit.

  • Buck Pomerantz from Crutchfield

    Posted on 10/28/2016

    Keith, One of the perks of buying gear from Crutchfield is that you get free Tech Support. Their toll-free number is on your invoice. Call them for free help troubleshooting your system. Click on this link for more details.

  • Keith Parker from Bastrop La. 71220

    Posted on 10/27/2016

    I bought a pioneer stereo from you through my Mothers name Melba Parker. I bought it after problems I had Because it only had 2 channel for speaker and two RCA jacks for a sub.I had to unhook it from a 4 channel Crunch amp. and I can"t get all channels to work now after hooking it back up. My question is what should I do to make sure all of my channels are working or might have a bad connection somewhere or bad wires. I tried to check my speaker outputs with a test light but could"nt figure out if they have power to them. Thanks for your advice!

  • Buck Pomerantz from Crutchfield

    Posted on 10/19/2016

    Joshua, When you splice amp connections into the receiver's RCA outputs and speaker wiring, like this article describes, whatever the receiver tries to send out to the front speakers will pass through the amp and on to the speakers - you shouldn't lose your Nav directions or phone audio. Now in some systems with factory receivers and amplifiers this won't work because either the receiver shuts down because it doesn't see a speaker load on its output, or the Nav and Bluetooth audio originate in the car's computer system and never travel through the receiver's output wiring. And under no circumstances should you connect the output of a receiver to the output of an amplifier - that will damage something.

  • Joshua from New Orleans

    Posted on 10/18/2016

    Buck, thanks for the article. Much appreciated. It helped me hook up my system. One question about this method though. What would need to be done if you have a navigation receiver that only sends out Nav audio and Bluetooth phone audio over the pair of front speaker wires of the receiver? If these wires are cut/taped, this would result in no nav/bluetooth phone audio. I know of a few Pioneer units where this is the case. Would it be possible to connect the front speaker wires of the receiver to the front speaker wires coming from the amp with the amplified sound and front wires of the aftermarket harness? Or would this damage the receiver or speakers? Thanks in advance.

  • Buck Pomerantz from Crutchfield

    Posted on 10/18/2016

    Corey, You can definitely hook up each of those speakers to a separate channel of that amp, that'll be the preferable way. Be sure to secure the speaker boxes to your vehicle. You don't want them flying around dangerously in the event of an sudden stop or accident.

  • Corey in Texas from Denison

    Posted on 10/18/2016

    i have 2 12" kicker comp S bridged on channel 3 and 4 on my SslDG41600, 1600w 4ch amp.I have 2 kicker 6.5" 4ohm 2ways. I dont want to tear out my Santa Fe's Infinity 6.5 as they work fine on the stock head and im still paying on the car. so i bought 2 boxes for the 6.5s. can i hook them up separately on channels 1 and 2? Or do i run them in parallel to channel 1?

  • Buck Pomerantz from Crutchfield

    Posted on 9/28/2016

    Logan, I'm not familiar with that iSimple kit, but if it makes your iPad's audio output available for an aftermarket amplifier, that's good. Assuming you have signal wiring, from the iSimple kit to your amp's inputs, and power wiring for the amp, this is a good opportunity to use 9-conductor speaker cable from the amp's outputs to the Metra harness. How're you fixed for connectors and installation tools?

  • Logan leatherwood from Boaz

    Posted on 9/27/2016

    Ok so I'm trying to connect my iPad to my car speakers and sub. I have an amp and I I have the isimple universal car kit , metro 70 1721, and wiring. Is that all I need? I don't have a head unit.

  • Buck Pomerantz from Crutchfield

    Posted on 9/13/2016

    Colton, If your subwoofer amplifier has preamp-level RCA outputs, you can use them to provide input for a second amp.

  • Colton Hillman from Linden

    Posted on 9/13/2016

    I have a big Kenwood amp in my 84 f150 powering my subs. I got told if i wanted to amp the factory speaker doors, do NOT plug it into my high powered amp, but get a smaller amp just for the door speakers. how would i go about wiring in another amp if my RCA cable are running to the big amp? Do i just run RCA cables from the output on the big to the input of the small?

  • Buck Pomerantz from Crutchfield

    Posted on 9/3/2016

    Jay, I say go for it, I can't think of a reason it wouldn't work.

  • Jay from Indy

    Posted on 9/2/2016

    Nice write-up. I am wondering if it is possible to leave four orig speakers (1-4)connected directly from the head unit AND ALSO add a 4 channel amp to feed four additional speakers (5-8). The amp and speakers 5-8 would function with the key on-vehicle running, while the orig speakers 1-4 would serve as the quieter camping speakers when parked with less power drain on my aux battery. Would this be feasible?

  • Buck Pomerantz from Crutchfield

    Posted on 8/30/2016

    Viv, Factory speakers often have low impedance and high sensitivity and play louder than aftermarket speakers. A speaker's power rating has no bearing on how loud it will play - that depends on how much power the amp sends it and how sensitive the speaker is to that power. I can't tell why yours sound muddy, but I doubt it has anything to do with the wiring. Trying to push 140 watts through factory wiring may result in some power loss but shouldn't introduce distortion. And running the RCAs and speaker wires together should be okay - it's the power wiring that can induce noise that should be kept separate from the signal wires.

  • Viv

    Posted on 8/29/2016

    Hi, Excellent article firstly! I have a query however. I have installed a 140rms x 4 amplifier (nominal power) to my new front door speaker DLS components which can take 140rms nominally as well. However they don't sound any much louder than when my stock was amplified before the bass starts to sound muddy and distorted. And the stock speakers were rated at 35w RMS! I've matted the doors, checked the polarity and those are fine. However the speaker wires are connected via the stock location at the receiver end as explained in this article. Can this really be the cause of the new speaker components sounding muddy before its rated power (140w RMS each) ? It sounds like 40w RMS power to me. The speaker wires from the amp and RCA cables from the Headunit are all run together next to each other as well. Not sure if that'll pose an issue!? Thanks

  • Buck Pomerantz from Crutchfield

    Posted on 8/29/2016

    Graham, I'm sorry this article isn't clearer about how to wire an amp into a car system. You connect the aftermarket receiver's RCA outputs to the amplifier's inputs via RCA cables. Then you connect the amp's outputs to the speaker wires of the vehicle harness via a 9-conductor speaker cable. Maybe looking at the photo and its captions will help you visualize how this saves running speaker wire throughout the car to each speaker.

  • Graham from Woodstock

    Posted on 8/27/2016

    Hi, I recently put a new stereo head into my 1996 Hona Civic Cx, soldering the head unit wires into the original system wires and leaving it at that. after that I put in two new kickers in the front two doors and two new kickers in the rear two outlets. all soldered into the original wires. the speakers sound great but when i max out the volume the sound sometimes cracks and even when maxed it isnt as loud and doesnt sound as great as i want it to. I would like to fix this by adding an amp but im not sure how to wire it in. as the article states id like to be able to just wire it to the head unit... but would that actually do anything for me? I just want to make my speakers get to full potential without doing a butt ton of re wiring and would love to be able to use the original factory wires plus a little more. this whole situation confuses me and ive tried to do as much research as possible but im still not sure exactly how to fix my problem. sorry if this is poorly worded or stated in an awkward way, i can re-word it if need be. thank you, graham also i am thinking about adding a sub in the near future, and would like to be able to add that if needed. but again, thats not exactly the issue at hand.

  • Buck Pomerantz from Crutchfield

    Posted on 7/29/2016

    Rob, Your question brings up a great point: I should show how to hook up an amp in a factory system with no RCA outputs, like yours. Step one: get an amplifier with speaker-level inputs. Referring to the photo in this article, instead of the RCAs pictured at the upper right, you'd use the speaker wires coming out of the radio harness (that we snipped off for the illustration). Using another of those 9-conductor cables, you'd connect from the radio harness to the amp's speaker-level inputs.

  • Rob from York

    Posted on 7/29/2016

    I will be using a factory head deck and a compact 4 channel amp to add power to after market speakers... I haven't ordered the amp yet but I know my factory head deck doesn't have rca's... I get the hook up you are describing... How would what I am looking to do be spliced in? Thanks!

  • Buck Pomerantz from Crutchfield

    Posted on 6/29/2016

    Francisco, The number of channels needed for a digital sound processor depends on how many speakers you want to run and how many output channels your receiver or factory amplifier has. For instance, if you have four speakers (front left, front right, rear left, rear right) you'd need a 4-channel processor. But if you want to add a sub later, you'd want to get a 6-channel processor. The processor will create the subwoofer channel outputs from the other inputs. You can use a 4-channel amplifier to run your four door speakers, and add a mono amp for a sub later on. Or you could buy a 5-channel amp and leave the sub channel unconnected until you get a subwoofer.

  • Buck Pomerantz from Crutchfield

    Posted on 6/29/2016

    James, Sorry I haven't responded sooner, but it sounds like you already understand this wiring technique.

  • Francisco Pando from Great Bend

    Posted on 6/28/2016

    I want to hook up a sound processor to my head unit and then run that to an amp. This way all four door speakers are taken care of. At some point in the future I ant to ad a sub in the trunk. My question is how many channels would I need on the processor as well as the amp?

  • James from St Petersburg

    Posted on 6/3/2016

    Hi Buck, Let me explain my application and if you could, tell me if how I would be using this is correct in my set up if you could. My equipment is being installed in a 2012 Nissan Frontier is as follows: JBL MS-8, a JL Audio Xd700/5, a Kenwood DDX6702s receiver, Hertz HSK 165.5 6 1/2 components for for front doors and dash, Hertz ECX 130.5 5 1/4 2 way speakers for the rear doors, and a JL Audio 10w3v3-2 for sub. I run a rca cable via the Kenwood pre amp output (just a left and right front channel because the MS-8 only requires a two channel input) to the MS-8 input. I will then run RCAs from the MS-8 outputs to the XD7005 inputs. From there, I wire the XD700/5 speaker outputs to the EFX 9- conductor cable (the front speakers will be wired to the component crossover from the XD700/5 front left/right speaker outputs and then the crossovers left/right woofer/tweeter output to the appropriate front left/right speaker wires in the EFX 9-conductor. Subwoofer will be wired directly from XD700/5), I then run the EFX 9-Conductor cable to the rear of the Kenwood receiver and wire it directly to the wiring harness speaker wire outputs which is then plugged into the factory wire harness that the speakers will be connected to from the factory locations. Also, how is the EFX cable color coded and is it to each specific vehicle? Is this how I would correctly utilize the EFX 9-conductor wire and eliminate the need for separate speaker runs? Thanks in advance for your reply!

  • Buck Pomerantz from Crutchfield

    Posted on 5/25/2016

    Juan, You run speaker wiring to components the same way as coaxial speakers except the factory wiring at the speaker end goes to the crossover input, and then new wire needs to be run to each tweeter and midrange speaker. Using factory speaker wiring for a 75-watt amp should be okay. It's when you have more power than that - 85 or 100 watts say - is when you'd benefit with thicker wire.

  • Buck Pomerantz from Crutchfield

    Posted on 5/25/2016

    Pete, The Rockford Fosgate system in your Sentra has an amplifier that drives the front speakers and subwoofer. There are no provisions for connecting more speakers to it. If you want more power for your rear speakers, add a 2-channel amplifier to your system.

  • Juan from Minneapolis

    Posted on 5/25/2016

    How about if I wanna have component speakers of the front and coaxial on the back? And also using a 75W RMS per channel is that going to be too much for 18 or 20 AWG factory wires?

  • pete from buddlake n,j

    Posted on 5/24/2016

    hey how are you today,i recently bought speakers for you guys,,they are Kicker 40CS674 6-3/4" 2-way car speakers,,they are working great,but i have one question i have read this little article on your site,,,,The Rockford Fosgate System adds a 300W amplifier and an 8" subwoofer in an sealed enclosure, located in the trunk. The subwoofer is a dual-voice coil design. The amplifier powers the front speakers and the subwoofer. The receiver powers the rear speakers only. as you can see,the info is for a nissan sentra 2006,,now my question is,,how or can i get power from the amp to the rear speakers,,,,i had skpoken to Garrett when i bought my speakers,,,,

  • Buck Pomerantz from Crutchfield

    Posted on 5/6/2016

    Jose, When running multiple amplifiers, you should use a distribution block to safely distribute power to all the amps in your system. Just make sure the primary power cable, from the battery to the block, is large enough to accommodate the total power draw of all the amplifiers.

  • Jeremy Kellison from Ocala

    Posted on 5/5/2016

    So I am installing 4 new speakers to a 4 channel amp to my factory radio. I'm adding a 4 channel line out convertor to accept the rcas. I would then just wire the line out convertor into my wiring harness thats there and just run the rca cables into that and then wire in my speaker wire into the harness to my amp? I have an amp already for my subs just adding a new amp for my speakers

  • Jose from Palmdale

    Posted on 5/5/2016

    hello, I already have an amplifier with 2 subwoofers, how am i going to power another amp to be used for my speakers? Thanks in advance for the answer

  • Buck Pomerantz from Crutchfield

    Posted on 4/29/2016

    James, Now that you're familiar with what an LOC is and what it can do, perhaps you're ready to step up to a multi-channel version, like AudioControl's LC6i. It takes the signal from your factory radio's front and rear speaker wiring and creates adjustable preamp-level outputs for your full-range speaker amplifiers and your subwoofer amp.

  • James from MN from Hastings mn

    Posted on 4/28/2016

    Your article was very clear and I appreciate your help. I do have a specific question as it relates to my car audio. Currently I am using a LOC for my amp to power a sub in back and I have retained the factory head unit. If I were to want to power the 6x9s in back and the 4x6s in front, how would I go about wiring a separate 4 channel amp. Thanks

  • Buck Pomerantz from Crutchfield

    Posted on 4/19/2016

    Chris, Those subwoofers are DVC 2-ohm subs that each uses a switch instead of a jumper wires to change impedance between 1 ohm and 4 ohms. I recommend setting yours to the 4-ohm setting and wiring your subs to that amp like this. In this setup, the two subs are wired together in parallel, and you would achieve the same results if you wired both subs to the amp separately.

  • Chris

    Posted on 4/16/2016

    I'm connecting a fosgate r500x-1d amp(500watts rms - 300x1@4ohms/500x1@2ohms) to 2 12" kicker compR rated 500 watts rms at either 2/4 ohms. Should I run them in parallel or series or can I just run the wiring from the subs directly to the amp?

  • Buck Pomerantz from Crutchfield

    Posted on 4/13/2016

    Justin, I recommend amping the front speakers, and drive the rear speakers off the receiver's speaker outputs, using them for "rear-fill" giving your big front stage stereo image some depth.

  • Justin Smith from jacksonville

    Posted on 4/12/2016

    My rcvr only has 2 channel pre-amp outputs. I want to use one for a sub, leaving me with one set for either the front or rear deck. Both are 6x9s. Both have same power output. Which speakers would you recommend I amplify, the front or rear?

  • Buck Pomerantz from Crutchfield

    Posted on 2/22/2016

    Glen, Not knowing what vehicle you have makes it pretty hard to answer any questions about its wiring. If you're going to replace the factory amp with an aftermarket amp, then you can probably use the factory speaker wires connected to your new amp's outputs. I would imagine that you'll probably have to replace whatever signal wiring the vehicle uses with new RCA cables between the new receiver and amp.

  • Glen from Hopatcong

    Posted on 2/20/2016

    my car came with a factory amp that i would like to replace, (I will also be replacing the head unit) the good thing is that all the wires from the head unit to the amp, and then from the amp out to the speakers are all located in one spot under the back seat (where the amp is mounted). My question is, can I use the factory wiring to get the speaker signal from a new head unit to the new amp,or do I have to run new RCA cables. It seems using the wires that are already there would save me a lot of labor

  • Buck Pomerantz from Crutchfield

    Posted on 2/14/2016

    Wayne, When replacing speakers and wiring, after disconnecting the factory wiring from the speaker, you can leave it installed as it was. Make sure and secure, with nonconducting tape or tie-off, any wiring connector from making contact with metal, which could cause interference or damage the receiver.

  • Wayne Roper from London

    Posted on 2/13/2016

    I understand the concept of using your 9 wire loom to splice into the main receiver harness, but what if, like me, you intend to run all new 12 gauge wiring to each speaker from a 4 channel amp? This option will obviously render the stock wiring redundant. So what happens to this? Is it simply disconnected from each speaker and taped up, in case of refitment of stock equipment later on, thus leaving it intact on the receivers harness. Or are the speaker wires cut at the harness to isolate them from the receivers signal? The way I understand it is, the RCA's will carry the signals down to the amp, and then the amp will send these signals to the speakers. Therefore the wiring at stock can be left alone and out of the way. Am I right?? Thanks.....

  • Buck Pomerantz from Crutchfield

    Posted on 2/12/2016

    Haylee, If you had purchased your gear from Crutchfield, you would have been advised about the special harness you need to hook up your new receiver to your car's factory amplifier. And, you could call Tech Support for free help troubleshooting your system. Their toll-free number would be on your invoice. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • Haylee from Fortuna

    Posted on 2/10/2016

    Im trying to hook up my pioneer AVIC X850BT to my already stock bose supreme stereo in my 2003 350z i get the pioneer to turn on but nothing but a buzzing noise out of my speakers how do i fix this?

  • Buck Pomerantz from Crutchfield

    Posted on 2/1/2016

    Jordan, Hopefully you meant to say you'll run the speaker wires from the harness to the amplifier's speaker outputs, not inputs - but it sounds like you're on the right track.

  • jordan from montgomery

    Posted on 1/31/2016

    Here is my scenario: 2014 LTZ Tahoe, Bose speakers, using bose amp. Rockford 12's on 1500.1 amp in back. I am about to replace the door speakers and amplify them. Here is how I am going to do this, correct me if wrong, (FYI I am mounting 4-channel amp beside the mono-amp in the back) I will run 2-sets of RCA's from the head unit back to the 4-channel. Hook the power/ground into the distribution black in the back for power. Connect the remote wire to the remote wire ran to my existing amp back there already. THEN, run all 8 speaker wires (spliced from the harness up front, to the back of the truck into the correct speaker inputs on the 4-channel amp. I came to 8 speaker wires total , by this logic: front DOOR speakers - 4 speaker wire FRONT +/- AND +/- rear DOOR speakers - 4 speaker wires REAR +/- AND +/- Let me know if this will work, thanks

  • Buck Pomerantz from Crutchfield

    Posted on 1/21/2016

    Hysheem, You can certainly connect an amplifier's outputs to your front and rear speakers via a 9-conductor cable to the factory wiring behind the receiver. You'll have to run new speaker wires for your custom center console speakers, though. It's best, for control and level balancing, to have each speaker powered by a single amplifier channel. For the 8 speakers you describe, that means two 4-channel amps.

  • Hysheem Perkinson from columbia

    Posted on 1/20/2016

    im wanting to put 4 35 watt 5 inch speakers at 35 watts and 4 6.5 inch speakers 50 watts each how would i go about wiring these to an amplifier and can i use my stock wiring my front speakers are the 6.5 and my rear are the 5 inch the rest will sit in a custom made center console and is it best to use a 2 channel or 4 channle amplifier

  • Buck Pomerantz from Crutchfield

    Posted on 1/8/2016

    Rick, Not knowing the RMS power rating of the subs, I can't make a safe wiring recommendation.

  • Rick Stringfellow from Fairview hts

    Posted on 1/7/2016

    I have two 18"Dvc2ohm SA subs and 2 amps 1 fosgate p10001bd an a JL Audio 10001v2

  • Buck Pomerantz from Crutchfield

    Posted on 12/9/2015

    Shawn, It's unclear what you want to accomplish here. If you want to run two speakers off each of your amp's four channels, eight speakers total, then yes, you can do that using two 9-conductor cables connecting the amp to the vehicle harness. Just connect two speakers, left dash and door speakers, for example, to each amplifier output terminal. If you meant to bridge your 4-channel amp to 2-channel operation and run four speakers, two on each bridged channel, then it probably isn't possible. Most amplifiers are not stable driving a 2-ohm load when bridged. If your amp can, you can use this connection method but you'll lose the ability to "fade" your music from front to rear. You'd connect both left front and rear speakers to one bridged channel and the right front and rear speakers to the other. The vehicle harness will distribute the amplified signals to the four speakers.

  • Shawn

    Posted on 12/8/2015

    Sorry my speakers are 4ohms I would like to wire 2 speakers in Paralell to get a 2ohm impedence but needed to know if that is possible with using the stock speaker wiring

  • Shawn

    Posted on 12/8/2015

    My aftermarket amp runs 75x4 at 2ohms if I go the route of using the existing wiring will this work or should I run all new wiring

  • Buck Pomerantz from Crutchfield

    Posted on 11/30/2015

    Jeff, You should never connect the outputs of two amplifiers together - in your case a receiver's amplified output and an amplifier - one will burn out the other, or both. The wiring scheme described in this article is for a system where the power comes from the amp and the receiver's amplified outputs go unused. I suppose one could fashion a system that could switch between an amplifier's output and a receiver's powered output, but I see no benefits to such an arrangement.

  • Buck Pomerantz from Crutchfield

    Posted on 11/30/2015

    Angel, Yes you can run four speakers with a 2-channel amplifier, but you'll lose the ability to "fade" your music from front to rear. You'd connect both left front and rear speakers to one amp channel and the right front and rear speakers to the other. The vehicle harness distributes the amplified signals to the four speakers.

  • Jeff from Altamonte Springs

    Posted on 11/26/2015

    What would happen if I run this 9 wire loom from amp and splice into the posi tap connectors already connected to aftermarket radio/harness? Would this allow the radio to operate if the amp was not on or allow me to install toggle switch to turn off/on amp and listen thru aftermarket radio without amplification? I would think if I discarded to wires coming out of receiver and taped them off and instead wired this loom to the harness it would only work if amp is on. Will my thought of connection to existing harness wires affect something negatively?

  • Angel from Philadelphia

    Posted on 11/25/2015

    Can this work with a 2 channel amp. 4 Door speakers and how?

  • Neal Green from Montgomery

    Posted on 11/16/2015

    Buck, your patience is admiral. I found that drawing out each step you described makes better sense than trying to sort it out in your brain. Lot of redundant questions being asked.

  • Buck Pomerantz from Crutchfield

    Posted on 11/12/2015

    Montana, In the wiring system described in this article, no new wires are run to speakers. RCA cables carry the signal from the receiver to the amplifier. A 9-conductor cable carries four amplified channels from the amp's output to the vehicle's harness, which connects to the speakers via the factory wiring. Sorry if that's unclear. We're working to improve the illustration and messaging to make it all easier to understand.

  • Montana Page from Grand blanc

    Posted on 11/11/2015

    So do you run the speaker wire from the 4 new speakers, instead of the dash to the amp and then connect them to the harness then plug into radio? (including already plugging in the rca cables)

  • Alexander Hrabe from Crutchfield

    Posted on 11/9/2015

    Duncan, you'll bypass the factory amp by using RCA outputs from your new head unit to the inputs on your new amp, then running new speaker wire to each speaker. If you'd like to use the factory speaker wire, you'll need to be able to make sense of factory color designations. We can help you with that. If you bought your gear from Crutchfield, you can call Tech Support for free help troubleshooting your system. If you purchased your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Check out our tech support page for details.

  • Duncan

    Posted on 11/6/2015

    So I have a 2011 F-150 with the Sony system w/o navigation. I bought a Pioneer AVH-X4700BS HU, Rockford 1683 door speakers, and a Rockford P3SD4-12 sub, all being powered by a Rockford Prime 600X5 amp. How will I connect the new door speakers to the new amp while bypassing the factory amp?

  • Buck Pomerantz from Crutchfield

    Posted on 10/27/2015

    Alex, Yes you can.

  • Alex from Charleston

    Posted on 10/26/2015

    If I connect an amplifier to my aftermarket door speakers, can I still use the speaker outputs from the back of the radio for more smaller speakers. Such as tweeters?

  • Buck Pomerantz from Crutchfield

    Posted on 10/26/2015

    Jody, We recommend for amplifiers with over 75 watts RMS of output per channel to go ahead and run new 14- or 16-gauge speaker wires directly from the amp to each speaker

  • Jody Treft from Liberty

    Posted on 10/24/2015

    Disconnect the factory speaker wires from the head unit and connect factory speaker wires to amp speaker wires. The RCA output from the head unit to the amp inputs sound from the amp to the speakers? If I understand correctly, my amp is 75 watts x 4 @ 4 ohms I can do this? But if I wire it 160 watts x 2 @ 4 ohms I should run new speaker wires from the amp to the speakers?

  • Buck Pomerantz from Crutchfield

    Posted on 10/22/2015

    Chad, Sounds right to me.

  • Chad Brooks from Renton

    Posted on 10/21/2015

    I think I'm starting to understand this. So right now I have one amp hooked up to my speakers/subs. I'm about to install a 4 channel amp for my speakers. I think I'll go ahead and get a 9 conductor cable , so I run that up behind my deck, clip the current speaker connections, and then attach the 8 speaker cables to the car side speaker wires and leave the speaker wires coming out of my deck alone right?

  • shawn

    Posted on 10/15/2015

    so you would cut right after the receiver harness which is after vehicle harness and connect the amp wire to the speaker wire heading away from receiver toward the cars receiver taping or capping the wires hanging out of the receiver that are no longer in use? wow, that is one giant run on sentence right there. Oh and the remote start wire goes to the receiver too? well I got to other amps with remote start so I guess it won't be to hard to figure out where they go.

  • Buck Pomerantz from Crutchfield

    Posted on 10/14/2015

    Shawn, Your usage of the words "forward' and "back" when describing signal flow is confusing, but I'll try and straighten things out. Eight of the wires coming from the receiver harness are the speaker outputs of the receiver and, using this wiring system, you no longer need them so they can be cut or taped so they won't make any contact with metal. Eight of the wires coming from the amplifier's speaker output terminals, via the 9-conductor cable, connect to the vehicle harness which connects to the vehicle's speakers.

  • Shawn

    Posted on 10/13/2015

    Yea I think I got it now say forward is into receiver and back means out. I cut the speaker wire that run forward toward receiver then connect the speaker wire to the wires that are running back toward vehicle harness. is that bout right?

  • Buck Pomerantz from Crutchfield

    Posted on 10/12/2015

    Shawn, Only one conductor of the 9-conducter cable goes to the receiver's harness - the 12-volt remote turn-on signal for the amp to turn on with the receiver. The other 8 connect to the vehicle-specific harness (usually free with the receiver) that goes to the vehicle's speakers. In this setup it doesn't matter where the amp gets its signal, direct from the receiver or daisy-chained from another amp.

  • Shawn

    Posted on 10/10/2015

    if the amp I am running the speaker cable from is getting the radio signal VIA through line output of another amp [Daisy Chained] {because already have a mono and a 2 channel amp running to receiver} will wiring the cable from the amp into the receivers harness still work?

  • Buck Pomerantz from Crutchfield

    Posted on 10/8/2015

    Keith, The 9-conductor cable used as in the article will have one end connecting to the amplifier's speaker output terminals and the remote turn-on terminal. The other end connects to the vehicle's harness, which connects to the speakers, and the turn-on lead in the receiver's harness.

  • Keith from Puyallup

    Posted on 10/7/2015

    So do I connect the 9wire cable from the amp to the head unit harness that came with the head unit, the aftermarket harness that is connected to the head unit harness, or to the car's original harness?

  • Buck Pomerantz from Crutchfield

    Posted on 9/20/2015

    Jacob, Either 14-gauge or 12-gauge speaker wire will work well for your subs.

  • Jacob Rogers from Nacogdoches

    Posted on 9/20/2015

    What gauge speaker wire do I need for a pair of 12s that are 1400 rms each?

  • Buck Pomerantz from Crutchfield

    Posted on 9/16/2015

    Matt, I think that most speakers would blow up if subjected to that much power no matter how the amp's gain was set. But not knowing exactly what amplifier or speakers you have make it impossible to give advice on how to wire them together.

  • Matt from Waterloo

    Posted on 9/15/2015

    I want to hook my back speakers up to my 900 watt Kenwood amp..but I don't want to blow my speakers...can you give me tips on what Ishould set the gain and volume on the amp to.

  • Buck Pomerantz from Crutchfield

    Posted on 9/9/2015

    Thomas, Let's see if I can explain the signal flow this article describes a little better. The preamp outputs of your receiver connect to the amplifier's inputs via RCA cables. Then, using a multi-core conductor, the outputs of the amp connect to the factory speaker wires accessible behind the receiver. The receiver's speaker outputs should remain unconnected to any wiring.

  • Thomas from Grand rapids MI

    Posted on 9/9/2015

    So instead of re connecting the stock speaker wire harness to my new deck I splice them into the amp with the two RC cables from the amp to the deck? Or do u splice it like a 3 way?

  • Buck Pomerantz from Crutchfield

    Posted on 8/18/2015

    Patrick, Normally you'd leave the factory wiring in place, making sure conductors cannot touch together or metal by covering the ends with electrical tape.

  • Patrick from Mesa

    Posted on 8/18/2015

    So if we do decide to run new speaker wire directly to the speakers, what do we do with the now unused wire that's connected to everything else? I'd imagine it wouldn't be easy to completely remove it.

  • Buck Pomerantz from Crutchfield

    Posted on 8/2/2015

    Matt, If I understand you correctly, and everything fits your vehicle, then yes you can replace older aftermarket speakers with new ones and use the older wiring. If you purchase your new speakers from Crutchfield, we'll include our vehicle-specific instructions free with the order, that illustrate in detail how to do the installation yourself. You can also purchase a MasterSheet separately for just $10.

  • Matt

    Posted on 8/1/2015

    Hi, My rear speakers are currently a couple kickers that are connected to an amp. I had it all installed by car toys. Now I want to upgrade my two rear speakers to the infinity kappa 693.11i . To do that is it something as simple as just unplugging the wire from the old speakers and plugging them into the new ones? I would love to just do it myself and save all that money on install. Thanks for the help!

  • Buck Pomerantz from Crutchfield

    Posted on 7/27/2015

    Adam, Sorry I don't have access to that information for that vehicle. Try contacting your local Chevy dealership, they may help.

  • adam from mesa

    Posted on 7/27/2015

    I need the wiring diagram for my factory speaker wire colors for a 2012 chevy traverse ls model non bose

  • Buck Pomerantz from Crutchfield

    Posted on 7/27/2015

    Galo, That steering wheel control harness will be specific to your vehicle and aftermarket receiver, and I don't have the technical knowledge on how to hook it up. Why don't you visit Axxess International, the makers of that harness, and see if you can get wiring diagrams and tech support from them.

  • Galo Chaquinga from Ecuador

    Posted on 7/26/2015

    Greeting I'm from Ecuador make a purchase in one harness OESWC- LAN amazon 29 H and desire to be able to help me a graphic indicating to serve some cables that have nothing printed thanks for your help

  • Buck Pomerantz from Crutchfield

    Posted on 7/19/2015

    Paul, The outputs of the receiver connect to the amplifier's inputs via RCA cables. The balance and fade controls on the receiver work just fine. This article merely spotlights one way of connecting the amp's outputs to speakers using a multi-conductor cable.

  • paul from philadelphia

    Posted on 7/18/2015

    Yeah but if you don't splice it with the wires from the receiver to then the fade wouldn't work or balance either on the receiver

  • Buck Pomerantz from Crutchfield

    Posted on 7/14/2015

    Chad, Not quite. The speaker wires coming from the amplifier's outputs hook up to your vehicle's harness connected to the car speakers. The only connections used in the receiver harness are the power connections for the receiver and the remote turn-on lead for the amplifier.

  • Chad from Illinois

    Posted on 7/13/2015

    Do I splice the receivers harness in with the amplified speaker wires and vehicle harness?

  • Jorge ochoa from Santa Ana ca.

    Posted on 7/3/2015

    Would like to see video on wiring speakers to amp.

  • Buck Pomerantz from Crutchfield

    Posted on 6/3/2015

    Gleidston, This article spotlights a method of connecting an amplifier to speakers using a multi-connector cable like EFX's 9-conductor cable. You would use RCA cables for the amp's input. If you buy your wires from Crutchfield, you could call Tech Support for free help wiring your system. Their toll-free number will be on your invoice. If you purchase your equipment elsewhere, you can still get expert Crutchfield Tech Support - 90 days-worth for only $30. Click on this link for details.

  • gleidston from framingham

    Posted on 6/2/2015

    what wires do l need to conected my pionner amp to my 2009 f 150 speakes l alredy have 1 amp to my subwoofer ,now i need to conecter another amp to my speakers

  • Buck Pomerantz from Crutchfield

    Posted on 5/24/2015

    Jason, As we tried to show in the illustration, the signal comes from the amplifier's outputs. The other ends of these wires connect to the vehicle's harness. That plugs into the car, which has all the wiring that connects to the speakers. The illustration doesn't show the receiver's harness, where power connections to the aftermarket receiver are made, nor the RCA patch cables, which connect the receiver's outputs to the amplifier's inputs. Sorry if that's unclear.

  • Jason from California

    Posted on 5/24/2015

    I don't understand. If you connect the speaker wires to the amp, then they are no longer connected to your can your speakers operate after you do that?