Amplifier wire gauge chart

Bryan G from sacramento

so im looking to just add a powered sub, upgrade the factory speakers and head unit, stock is 2x 4in 2x 6.5in and 2x 6x9in speakers, the new speakers are all 30w rms, 4 ohms, 1, can i run the two 4in off the headunit rated at 16w rms, peak 50w on 4 channels, 2, would i need a amp for the two 6.5in and two 6x9in speakers, based on total of 260w rms plugged in to the equation (2(260)x.75)/13.8 i get 28.3a would 10ga work?

Buck Pomerantz from Crutchfield on 6/25/2019 Bryan, Without knowing precisely what vehicle, what its factory system consists of, and what upgrades you want, we can't help you with system planning. If you're adding a powered sub, you should use whatever size power wire is called for in its owner's manual, or correctly use the formula in this article knowing the RMS wattage of the amp.

Jared from Colorado Springs

Hi Buck, I am upgrading my sub amp and want a second option on the wiring. Here's my current set up - 4 awg OFC fused at the battery (80 amps) to a fused distribution block in my trunk. One 8 awg ofc power wire runs (40 amp AGU fuse in the distro block) to power a Kicker Cxa400.1 amp for my sub and a second 8 awg ofc power wire (in second output from the distro block, fused at 40 amps) to a Rockford Fosgate 1 farad capacitor. I had it professionally installed and was surprised that they wired the cap to its own fuse. Negative d block is three 8 gauge inputs to one 4 gauge output grounded to the car (one Input unused).Now I am upgrading my amp to a Kicker CXA600.1 (2016 model), which will be ran at 2 ohms. Given the short run from the distro block to the amp, can I use the same 8 awg ofc wire fused at 80 amps? Should I rewire this setup to use just one distro block positive wire output (d block wired to cap, then run the amp directly off the cap) to make the best use of the cap? Or since the cxa600.1 calls for 4 gauge, should I upgrade to all 4 gauge ofc (and if yes, again,should it be distro block to cap to amp)? Lastly, I think my alternator is only rated for 105 amps, am i pushing it with this amp and cap? I have upgraded to an amg battery but I'm wondering if a Big 3 upgrade (with 0 gauge) is going to be necessary. If it matters, I don't plan on blasting the sub amp at max power, the smaller amp I have now is just a little too weak, but not much....thank you!!

Buck Pomerantz from Crutchfield on 6/3/2019 Jared, I think you can leave the wiring as is for the new amp. The increase in power isn't enough to justify larger cable.

Ryan Moone from Bedford

I am looking at installing 2 kicker marine amps, 4 channels each in my boat, both the 44KXMA400.4. Is 4g from the battery to the fused distribution block, then split into 8g to each amps sufficient? This will be powering 6 kicker km65 (65rms x 6) boat speakers and 2 Kicker 45KM84L (150rms x 2).

Buck Pomerantz from Crutchfield on 5/28/2019 Ryan, That sounds good to me. Don't forget the inline fuse near the battery. An 80A or 100A fuse will work best.

Dinzel from Columbus

I wanna put 2 amps in my car I have the Kicker CS speakers that's 6x9 and our 150 a piece and I wanna run my two front speakers to a amp that's rated 300 watts and I have 2 audiopipe and there rated at 1800 rmsand I have a amp for that's rated 1800 rms and I wanna put it in my Toyota Camry LE 2006 and I have a Sony deck that's supporting front speakers and for a sub I know the formula is 2100/13.8 which is 152.17 so I know my amp fuse should be around 100-200 more likely I wanna put a 200 amp fuse in and should I go with 2 gauge or 0 gauge since it's about 16-19ft?

Buck Pomerantz from Crutchfield on 5/28/2019 Dinzel, You didn't take into account your amplifiers' efficiency. If they're Class AB amps, you divide total wattage by one-half (the amps' efficiency) before dividing by 13.8 volts, getting 304A, which will work with 1/0-gauge wire and a 300A fuse. If they're Class D amps, you divide total wattage by three-quarters (the amps' efficiency) before dividing by 13.8 volts, getting 203A, which will work with 1/0-gauge wire and a 200A fuse.

mike from durant

at what power level should you upgrade your factory speaker wire or use bigger than the 18ga speed wires?

Buck Pomerantz from Crutchfield on 5/20/2019 Mike, A system powered at 100 watts or more per channel will benefit from using larger gauge speaker wire.

Dustin Williams from Pomona

I'm running a Orion CB3500.1D Cobalt Series Monoblock Class D 1-Ohm Amplifier wired at 1ohm with two Kicker L7's in a ported enclosure. I'm using a Kicker 4g wiring kit with a 100amp fuse. Do you think I need a 0 gauge wire as the amp has been tested to put our 1400-1500rms at 1ohm load?

Buck Pomerantz from Crutchfield on 5/16/2019 Dustin, I would use 1/0-gauge power and ground wires for that amplifier seeing it has 200-amps worth of fusing.

Al germany from riverside ca

I have a t1500 1dcp and kicker 250 4 channel amp running off of 4 gauge wire with one 200 watt fuse is that safe to run or should each amp have it own fuse?

Buck Pomerantz from Crutchfield on 5/8/2019 Al, To be safe, besides the fuse near the battery, each amplifier's power lead after the distribution block should also be fused - 200A for the sub amp, 60A for the other.

Justice from Phoenix

Is your chart based on cca or off wiring because all of my amp wires are off and from what I've been told it supports a significant amount more power than it's cca equivalent. I'm going to be running 3 amps (1 sub) and 2x4 channels) the 4 channels have very different RMS Ratings (300 Watts and 1000 Watts) and I basically want to verify that I'm putting the right speakers to the best amp based on a tual power they're going to see from each amp and obviously the wires can have a huge effect on that. Thanks in advance

Buck Pomerantz from Crutchfield on 5/6/2019 Justice, This chart is for copper wire, whether oxygen-free or not. Generally, copper-clad aluminum (CCA) wire can only safely carry about 60-70% of what copper wire of the same diameter can.

Damon King from Whitehouse Station

Would 8 Gauge Rockford Fosgate amp install kit from the battery to the amps on Alpine MRV-F300 and Alpine Alpine MRV-M500 suffice? Looking at running from battery to front seats which is under 12 feet. MRV-F300 will be 50 watts by 4 configuration. I did the math 500 total watts multiplied by 1.25 (Class D 80% efficient) divided by 13.8 and end up with 45 Amps.

Buck Pomerantz from Crutchfield on 4/25/2019 Damon, That 8=gauge amp kit will work just fine in your amp installation.

Scott from Green Bay

I'm about to overhaul my Pontiac G6 system, including new main speakers and stereo (pioneer AVH-X4800BS). I already replaced the rear speakers and noticed the wires are tiny. Maybe 18ga, but I'm not sure. I don't plan to add an amp to the mains right now and not sure if I will in the future, so would it be worth it to upgrade the speaker wiring now when just running off the stronger aftermarket stereo?

Buck Pomerantz from Crutchfield on 4/19/2019 Scott, You're right, factory speaker wiring is usually 18-gauge. It'll work fine for your application.

Ronnie from Seguin

I have a volfenhag element-5 2600 watt full mosfet monoblock amp wanting to know true rms of it and if it is 1 ohm stable or can power four svc subs two of them are 400 watt rms the other two are 300 watt rms can i run it parallel and be ok

Buck Pomerantz from Crutchfield on 4/13/2019 Ronnie, If you're referring to Volfenhag's ZX5167, then judging by its 60-A of fusing and its AB Class, I'd say it will put out up to about 420 watts RMS. The online ad I saw for the amp says it is stable for one-ohm operation.

David Lersch from Las Vegas

Lots of good info here,but I just want to double check. I'm installing a 400W RMS (1 ohm) sub amp and 60W RMS 4 channel amp. I got a dual amplifier wiring kit and the main power cable is 4 gauge, then it splits to 8 gauge at the distribution block. Is the 8 gauge enough to power the sub amp efficiently? It's the kicker 46cxa400.1 class d.

Buck Pomerantz from Crutchfield on 4/13/2019 David, Sounds good to me. Rock on.

Thomas from Barstow

Hello I bought a JL AUDIO XD600/1 amp for my JL audio 10in W6 sub and a JL Audio XD400/4 for my front and rear speakers. When I bought the amps I picked up an AMP wiring kit for both amp. But now looking at the wiring chart I am not sure if the wiring kit has the right size power cables for my car. The car is a 2015 accord 4 door. I was going to run the 4 gauge power wire from the battery to the trunk then off of the TSPEC power/ fuse block run 4 gauge to the amps. The distance from the fuse block to the amps would be less than 2 feet. But I am worried about the main run from the battery to the truck. Would I need 2 gauge power wire for that and if so does Crutchfield sell it since I bought my multi amp wire kit from them when I purchased my amplifiers?

Buck Pomerantz from Crutchfield on 4/5/2019 Thomas, Your question has raised an important issue with the formula used in this article which will lead to a revision in the future. The stated formula is for Class AB amplifiers, which are generally 50% efficient. Your amps are Class D, which are typically 80% efficient. So, in that case, you've got a 75 x 4 amp plus a 600 watter which totals 900W. Instead of 2, you'd multiply that by 1.25, equaling 1125W. Dividing that by 13.8V yields a total draw of 81.5A. In other words, a 4-gauge main power cable will work fine for your amps.

Mike C. from Washington, DC

This is THE best comments section I have ever seen! I have already posed these questions to the online Crutchfield advisor, who were an EXCELLENT help but I just want to be double sure as I do not want to see my friend's bike burst into flames! I am RE-installing 2 amps (a 600W Kenwood KAC-M3004 and a 400W Clarion XC2410) onto a friend's Victory Cross Country motorcycle; the last install was a firetrap waiting to happen. The Kenwood KAC-M3004 has an 8AWG power wire going to the battery about 60" away. The amp comes with a 30A fuse. Should the inline power fuse also be 30A or higher (currently there is a 60A inline fuse connected)? The same for the Clarion XC2410. It will be mounted about 36" from the battery. It has an external 40A fuse. Should the inline power fuse also be 40A or higher? Also, for the Clarion, the power and ground wires has a pigtail connection which uses 12AWG wires. Should/can the wires stay 12AWG? The previous installer spliced on 8AWG power wire to the 12AWG wire and ran this (UNFUSED!!!) to the battery. I do not trust ANYTHING that he did. Thanks!!!

Buck Pomerantz from Crutchfield on 3/27/2019 Mike, Both of those amps call for 10-gauge power and ground wires in a normal car install. But for a motorcycle, the runs are much shorter so the wires can be smaller. (It's alright to splice larger wire onto a power lead, as long as the connection is tight and secure.) The inline fuse by the battery is there to protect the wire and the vehicle in the event of a short circuit, and its value depends on the size of the wire. For 10-gauge power wires I recommend using 30A fuses.

Ryan Quigley from Atlanta

I have a JL 12W7 sub (3ohm) with a JL JX1000/1D amp (14.4v - 750W RMS or 12.5v - 700W RMS) and some 4 ohm speakers with a JL JX360/4 amp (14.4v - 70w rms x 4 or 12.5v - 55w rms x 4) I was goin to use 0 guage to run from battery to non fused distro then a 4 guage to the 4 channel and a 0 guage to the mono, I want to know if that is ok to do and if not what should I run? Also what size amp fuses I need and where to place each? And can I use 16 guage wire for speakers as well as sub? Please help me out, thank you.

Buck Pomerantz from Crutchfield on 3/23/2019 Ryan, Run 1/0-gauge wire, with a 150A fuse near the battery, from the battery to a distribution block. You can't run 1/0-gauge wire to that sub amp because its power terminal only accepts wire 4-gauge and smaller. Use 4-gauge for both amps. For safety's sake, you need to install additional fuses, 80A for the JX1000/1 and 50A for the JX360/4, inline on each amp's power wire. It'll be easiest with a fused distribution block.

Roger from Grand forks

I have 2 12 kicker comp running 300 rms what wire should it take? Currently has a 8

Buck Pomerantz from Crutchfield on 3/15/2019 Roger, For subwoofers, we recommend using 16-, 14-, or 12-gauge speaker wire. If you're asking about power wire, the size of the amp determines that, not the subs.

Hank from Harrison ARK

I have a one channel 1500watt boss amp a 10inch sub what size of power cable remote cable and ground cable

Buck Pomerantz from Crutchfield on 3/13/2019 Hank, Boss recommends using 4- or 8-gauge power and ground wires. Remote turn-on leads are usually 18-gauge. Why don't you pick up an amplifier wiring kit and get everything you need for your amp installation, including a fuse and holder, in one package.

Sam from Binghamton

Hey Buck I just bought a diamond audio de1200.1 d amp to power 2 12 powerbass subs what gauge wire should I use?

Buck Pomerantz from Crutchfield on 3/1/2019 Sam, The owner's manual for that amp recommends using 4-gauge power and ground wires.

Caelin Lee Santee-Buenger from Eau Claire

I will be buying the Rockford fosgate p3d4-12 and running it at about 500-600 Watts RMS in a sealed box. What gauge wire should I buy?

Buck Pomerantz from Crutchfield on 2/18/2019 Caelin, We recommend using 16-, 14-, or 12-gauge wires for subwoofers.

Dan

Any particular reason Crutchfield recommends 12 gauge speaker wire for JL Audio subwoofers?

Buck Pomerantz from Crutchfield on 2/9/2019 Dan, We recommend using 16-, 14-, or 12-gauge wires for subwoofers to ensure good current flow for efficient power production without loss due to high resistance in the wire.

Jason Heinrichs from Caldwell

I'm running a RF 75x4 and a 10 yr old RF prime 500.1 @ 1ohm on 2 RF D4 P2's. I don't know what power rating is on the sub amp at 1ohm. How do I find this info, and what gauge power/ground cable should I be running? Currently it's 4g run front to back to distro block and 8g short cables to amps.

Buck Pomerantz from Crutchfield on 2/9/2019 Jason, If you're referring to a Rockford Fosgate Prime R500-1 amplifier, it won't work well with a 1-ohm load, and will probably go into protect mode before overheating. The 4-gauge power lead will work fine with your setup.

Scott best from Newburgh

I have alpine 6 1/2 components from and rear, ss65c. I was thinking about the alpine mrv f300. Will that be ok size wise? I'm going to match up with a jvc double din and possibly a kicker 8 inch powered sub for a little base. Car is small it's a Suzuki sx4.

Buck Pomerantz from Crutchfield on 1/29/2019 Scott, Sounds like a good plan to me.

Steve from Peoria

With all things equal except amplifiers, what's better for 4 door speakers and a single sub, a single 5 channel amp or a 4 channel + a 1 channel? I'm comparing the Kenwood X801 or a pair of Alpine MRVs 500 single and the 300 4 channel. This is for a front set of 6.5" Focal ISS components, rear 6.5" Focal ISC 2-ways and a single RF P3D4-10 wired at 2 ohms.

Buck Pomerantz from Crutchfield on 1/25/2019 Steve, Either of the amp configurations you mention would make an excellent system. Personally, I'd go with the 5-channel amp because there'd be less wiring involved and less space taken up.

Steven from SAN BENITO

I just recently purchase an Alpine Mrv-m500 to power my rockford fosgate P2D4 8" Punch P2 500 Watt 4 Ohm DVC. It does sound good but at high volumes the subwoofer goes out and amp stays on. I do have a factory head unit on it. What could cause this?

Buck Pomerantz from Crutchfield on 1/10/2019 Steven, It sounds to me that your amp is going into protect mode, protecting itself from the high input you're pushing at it. Lowering the amp gain will probably fix this. If that's not loud for enough you, consider getting a higher-powered amp and sub.

Bryan from Bentonville

I currently have a 1500 watt vm1500.1 mono amp. I have 2 alpine 12inch sws12d4's. It is currently wired at 4 ohms and I'm trying to wire it at 1 ohm. I have 14 gauge wire coming from the amp. Is it bad if I mix gauge wire as I'm currently out of 14 gauge?

Buck Pomerantz from Crutchfield on 12/31/2018 Brian, For subwoofers, we recommend using 12- to 16-gauge speaker wires, so as long as you use those sizes, you can mix speaker wire of different sizes together in your wiring.

Rob from San Jose

Hi Buck, impressed with all the knowledge sharing here! Here's a good one for you: Alpine PDX-F6 (150 x 4 RMS = 600W) powering: - Rear hatch: 2 x Hertz 165 XL (100-300W RMS each) - Rear doors: 2 x Alpine Type R 6.5" (100-300W RMS) (Amp (600W) v Speakers (400-1200W)) Alpine PDX-F6 (150x4 RMS) powering: - Rear hatch: 2 x Hertz 165 XL (100-300W RMS each) (Amp (600W) v Speakers (200-600W)) Alpine PDX-F6 (1x600 RMS) powering: - JL Audiob12W6v3-D4 (400-900 RMS) (Amp (600W) v Speakers (400-900W)) Total: 1800W RMS Other niceties: Head unit: Pioneer AVIC8200-NEX Capacitor: 1.5 farads Northstar 31M AMG battery ARB Element fridge ARB Twin Compressor Radar detector Dashcam QUESTIONS: 1) I'd like to the "Big 3" upgrade. Should I use 4/0 gauge? 2) What gauge wires from the battery to a 3-way power distribution block? (I'm thinking 4/0 gauge) 3) What size inline fuse from the battery to the 3-way power distribution block? 400? 4) What gauge wires from the power distribution block to each of the amps? 4 gauge? 5) What gauge speaker wires? Thinking 12 or 14 gauge?

Buck Pomerantz from Crutchfield on 12/15/2018 Rob, Big Three upgrades are usually done using 1/0- or 4-gauge wire. If I understand correctly, you have three amps with a total power rating of 1800 watts RMS. A 1/0-gauge power wire from battery to distribution block will work. Don't forget the fuse near the battery - a 250 to 300-Amp fuse will make it all safe. Then you can run 4-gauge to each amp from the distribution block. And each amp gets a 4-gauge ground. 14- or 16-gauge wire works well for speakers, but if you can fit it in, 12-gauge speaker wire works too.

Don from Parma

I'm asking just to be on the safe side. I have a pioneer class D, 1 channel amp, 800 watts rms at 1 0hm, I have one 12, 2 ohm dvc wired in parallel so it's 1 ohm. I did the math mentioned above, my result at about 16 feet was 115, so I'm good with a 4 gauge wire, right? Thanks in advance!

Buck Pomerantz from Crutchfield on 12/12/2018 Don, If you're referring to a Pioneer GM-D8601, then yes, it does call for 4-gauge power and ground wires.

Anthony whitsey from Vallejo ca

Hey buck , I'm running a 2400 watt amplifier for my two 1000 watt subs.... what's the correct amplifier wiring kit I need to run it ?

Buck Pomerantz from Crutchfield on 12/3/2018 Anthony, That depends on precisely what amp you have. A Class AB amp capable of that amount of RMS output probably needs 2/0-gauge power and ground leads. A Class D amp could probably get away with 1/0. If you're quoting peak ratings, forget all that, and go with what the manufacturer recommends.

Vincent from East Northport

I have 2 amps 4k for subs 800 for mids/highs so as far as I understand now my single run 18feet of 1/0 is not delivering enough power to run the amp at 4000 W .?

Buck Pomerantz from Crutchfield on 10/12/2018 Vincent, If your amplifiers can put out a total of 4,800 watts RMS of power, then one 1/0-gauge power and ground wires will not be enough to support them. Can't say anything about it if those ratings you mentioned are actually peak specs.

Joe

1800 watt amp on 0 gauge wire... what size fuse do I need on 0 gauge

Buck Pomerantz from Crutchfield on 10/9/2018 Joe, A fuse rated for 200A to 300A will safely protect your 1/0-gauge power wire.

Joshua Roy C Sanchez from Manila, Philippines

Sir, I just want to inquire from you. Is JL Audio 10W3V3-4 subwoofer a good match for Alpine PDX-V9 Amplifier? thanks..

Buck Pomerantz from Crutchfield on 9/21/2018 Joshua, That 500 watts RMS rated sub will work great with that amp's 500 watts RMS subwoofer output.

Jose from Monterey

Speakers keep blowing up... 4gauge wiring but I bought the amp kit with 100Amp fuse Installed an alpine mdr M1000 500@4ohm 1000@2ohm Had a 4 ohm dual voice coil 12 sub + to + and - to - =(2ohm?) Also tapped in to the rear sub on my 207 Lexus is250 for the channel going to amp oh, and along with the rca converter Lexus sub->converter->amp It's the amp to strong to handle speakers? Sub was a Audiobahn 12'' 450watt Also had another sub GS Audio 1000 watt max 12'' sub And a JBL 12'' 1000 watt max sub Which all blew up after a couple minutes of music. Started smelling burnt. Manual did say use an 80amp fuse, read your post saying it's ok to go a bit over (remember amp kit I bought came with 100amp fuse). Should I switch to 80amp? How do I wire a 4ohm dvc to 4ohm?,..should I just use one VC (4ohm) so that I don't draw 2ohm from amp? Or just get a 4ohm SVC? Don't knw what's happening? Guess I'll check the RCA converter to make sure wiring is ok? Any suggestions will be greatly appreciated!!!

Buck Pomerantz from Crutchfield on 9/13/2018 Jose, Sending 1000 watts RMS to a subwoofer rated for half that amount will blow the sub, as you've experienced. If you want to use that amplifier, get a subwoofer rated for 750 to 1500 watts RMS and can get wired as a 2-ohm load. Use RMS ratings, never use peak ratings.

Jamie from Dirty Myrtle

Hi. I'm hooking up an RF 400-4d to 2 sets of RF T1675 components. I'm planning on using 18ga. 9 (8+remote) conductor wire to get back to the front speakers. The amp came in at 601w @ 2 ohms. I figure it's roughly 400w @ 4 ohms. Is 18ga. enough for 100wpc or should I double and run the 9 conductor as if it were a 5 conductor (4+remote)? I'm planning on using crossovers closer to speakers rather than the amp but in the case that I need to keep crossovers in the back, will the wire be suitable for any and all conceivable configurations of this equipment? Chrysler 300...

Buck Pomerantz from Crutchfield on 7/31/2018 Jamie, For an amplifier, like yours, that will put out up to 75 watts RMS per channel, 18-gauge speaker wire will work just fine.

David from Delray

Currently have Pioneer GM-D8601 800W powering a Rockford Fosgate Punch P3D2-12 12" Dual 2-ohm and running 4 gauge from battery to the amp. Looking to BUY a Pioneer GM-D8604 to power my already installed Kicker 40CS674 6-3/4" 2-way Speakers (front doors - but want to replace with some components soon) and Polk Audio DXi691 6" x 9" 3-way Speakers (rear deck). Now my questions are: I get back a amperes rate of 174 (rounded up) and drive a Chevy Impala. Would the already ran 4 gauge cover my power draw or jumping to 2 gauge for sure? 2nd Question: I would then take the already ran 4 gauge and use a T-Spec DB-1424 to handle the ground distro and power distro (as its not a fused disto)?? 3rd: If above I have wrong - options? 4th: Can 4 gauge be used for a 2 battery set up or going to a HO Alt seem more feasible?

Buck Pomerantz from Crutchfield on 7/11/2018 David, This wire chart uses a formula that's conservative and results in safe applications for every kind of amplifier. Your amplifiers use Class D technology which is more efficient and would draw more like 109-A at full-tilt. That means you can use 4-gauge wire throughout your installation.

Gabriel from Abingdon

Hi, english is not my first language so I'm strugling a little bit to figure which wiring kit I should look for, could you give me a hand? I've got a "Edge twin Subwoofer" it is two 12" speakers with 900w each, it has and built in amp which is an "ED7300". The power is 600w RMS and the peak is 1800w. Thank you in advance Buck. Gabriel.

Buck Pomerantz from Crutchfield on 6/5/2018 Gabriel, That powered subwoofer will need a 4-gauge (AWG) power and ground wiring kit.

Jose from LAWRENCE

Hi my is Jose I want to know what gauge should I use for my system cause I keep blowing my power line fuse I have a 2500 watt amp for my subs and a 1000 watt for my mids

Nate from Grand Rapids

Alright so i have 2 alpine swr-1242d subs that are hooked up at 1 ohm in a Belva BBX212BK box and the amp i have is Rockford Fosgate R1200-1D. Im running 0 gauge ground and power wire with a 150 watt fuse to my amp and i think 12 or 16 gauge speaker from my amp to my subs but for some reason only my negative speaker wire that goes from my amp to subs keeps burning and i dont know why. Should i just get bigger speaker wires or is there something more that im missing?

Christopher Lee Hane from St paul

Why is it that all your recommendations exceed what is considered safe in 310.15 b 16. I don't know much about sizing wiring for adio and am interested in reading more about it. Could you link me some good information. If not no worries thanks. I'm probably asking a lot

Cliff from San Diego

Are the recommendations on the amp pages based off the longest length wire runs in the chart? For instance, the amps I am looking at say 4 gauge recommended, but I'm doing the math here and finding 8 gauge to work. For instance, a 4x100 rms amp gets me just under 60 amperes, which at a ten foot or under power wire length should be okay per the chart. Am I doing the math right?

Rich from Plymouth

I have four speakers all Kickers that have 60 watts rms. I'm putting in a Pioneer amp that will put out 100 watts to each one. Question is will 18 gauge speaker wire be ok for this setup? I don't think I'll be cranking it up to high so I'm hoping I can get by with it. Thanks!

Sheri from Duluth

Im having an issue with my fuse blowing in the wiring kit for the positive cable... i have 1600W wiring kit a 2400w kicker and 2 2000w Orion comps subs. What do i need to wire these correctly

logan from spring hill Kansas

I have a 300-watt amp now and want to get a 600-watt amp. will I need a new power and ground wire for the 600-watt amp to work

John from Portland

Buck, I'm trying to verify my installation configuration. I will have three amps. KAC-X542 rated at 4 x 60 Watts RMS @ 4 ohms & 14.4 volts. 4 speakers are rated at 60 Watts @ 4 ohm KAC-522 rated at 2 x 125 Watts RMS @ 4 ohms & 14.4 volts. 2 speakers are rated at 100 watts @ 4 ohms R750-1D rated at 1 x 750 Watts RMS @ 1 ohm & 14.4 volts. 1 sub (p3d2-12) rated at 600 watts DVC @ 2 ohms I have a 2 guage wire from the battery with a 200 amp breaker. I plan to have a distribution block with 60 amp fuses going to each amp. I plan to use 8 gauge wire from the block to the amp. Have I sized everything appropriately? Thanks!

Philip seitz from Oklahoma city

Hey, so I've been researching my wire, and it turns out it is oxygen free copper(OFC) so would you be able to shoot over the calculations again if I was running 4x40 watt RMS in a 8 gauge OFC at 17ft To see how big of a powered sub I could add to this power wire

Philip seitz from Oklahoma city

Thank you

Philip seitz from Oklahoma city

Hello, i was wanting to make sure my math was correct, I have an old system I installed , a Rockford fosgate 4-channel rated at 40-watts RMS at 4ohms and the power is a 17ft 8 gauge in (what I believe to be) aluminum wire... I am running on this amp 2x50 watt RMS kicker door speakers, and 2x 50 watt RMS tactile bass transducers.. My question is: is If was to add a powered subwoofer to my system what would be the RMS I would need to keep it at to safely keep the 8 gauge as my power wire and just put a distribution block on it? These are the potential powered subs I am looking at that (according to may math) will work with 8 gauge and my other amp.. Basspro JBL SW (125 RMS) Pioneer TS WX120A (50 Watts rms) Kenwood KSC SW11 (75 RMS) If I could go bigger and still "play it safe" Then I will definitely like to do more watts

Mark from Rio Rancho

I am currently running two amps. I have I Rockford p300x2 running my components up front and an Alpine mrp m350 running my subs. I currently run a 4 gauge cable about 17 ft. to a distribution block and then run 8 gauge power wires to each amp. I'm thinking about getting a new amp for my subs, the JL Audio JX500/1, but it shows to need a dedicated 4gauge power wire. Can I run a 4 gauge wire from the distribution block to the amp without changing any of the other cables or do I need to now run a 2 gauge from the battery to the distribution block?

Maciazka from EYOTA

Sorry, I didn't read through all of the comments. But I'm a little confused on the total RMS thing. I know what RMS is vs peak and blah blah blah. My confusion is in understanding the ohm you should look at for this RMS rating. For instance a JL JX500 is rated 300w @ 4ohms but 500 @ 2ohms. Am I looking at the highest it can do no matter what the ohm rating is? For instance if it's a 1ohm stable amp, then that is the wattage I want to use? Sorry for the long-winded question. I guess for a monoblock amp, the question should be as follows: Do I want to use the highest RMS rating that I find (determined by whether the amp is 4ohm stable, 2ohm stable, or 1ohm stable)? Thanks.

Rob from Indianapolis, IN

I have a Pioneer GM-A5602 amplifier. This things has a max power of 900 watts at 4 ohms bridged, 300 watts at 4 ohms and 450 watts at 2 ohms. I am running 4 ohm subs. It is a 2 channel amp. My battery is in my trunk, so I only need to run the cable like 4 feet. So I should go with 4 gauge cable? Thanks for your help.

Austin

i plan on running a 2000w rms sundown audio amp to power 2 sa-12 subwoofers, with each sub getting 1000w each what gauge speaker wire should i use for this set up? Thanks

Radha from Sydney

Hi there, I have a Hertz HCP4 amp and I am planning to run to run 3 Ch: 65 W x 2 (4 O) front speakers + 190 W x 1 (4 O) for subwoofer at approx 10 to 13 ft of cabling for my Toyota Landcruiser 200 series. What AWG would i need for this setup. Thanking you from Australia

Ari from SUNDERLAND

Okay so Im planning on getting a "Pair of SA-12 Sundown Audio 12" 750W Dual 4-Ohm SA Series" and I'm wondering if a "SUNDOWN AUDIO SAE-1500D 1500W RMS MONOBLOCK CLASS D" Amplifier will work with this set up. *Further, would I need to get an extra battery to power this set up?

joshua from Danville

Okay. I searched high and low for an equation that made sense and I think with your formula I've figured it out. I have a Soundstream Rubicon Nano 3000 watt D rated single channel. It's RMS reading for the application in which I'd like to use it is listed as 600w RMS x1 channel at 4 ohms which matches exactly the reading on my subwoofer setup. The subs are Dual Electronics Illuminite (2) 12" and are listed as 600w RMS x1 channel at 4 ohms. According to your formula I take the 600 watts of RMS and because it's a single channel I simply double that number. After doubling the 600 watts of RMS power and getting 1200w RMS I then divide that by 13.8 to achieve my total of 86.95 amperes. Assuming I've used the correct RMS numbers, my amp has several ratings but this matched my subs numbers, I'd be safe using 4 gauge power and grounding wires. Straight line from my battery to the sub enclosure in the trunk is about 9 feet but I've yet to run it through a firewall and under the carpet so I'll be using closer to 13-15 feet. My amp also had an RMS output of 1200w x 1channel at 4ohms but states bridged. Am I correct in assuming that the formula I used in the top is correct because it matches the power of my subs or is it considered bridged because there are two subs in the enclosure?

Raimondas from Rotherham

Hey, I have alpine SWR 12d2 3000w peak, thats 1000rms with pioneer GM -D9601 amp is 2400w. Bought 2 gauge wires for amp. They will be ok? Now not sure about power capacitor wich one I have to buy, 3 farad will be enought? And not sure about amp power fuse how big need? I Will be verry thankful if someon help me. Thank you

Lucas from Lynnwood

Ok so i have 2x hi fonics titan 1000.1 amps (hi fonics txi 1008d) which being class D and hi fonics i assume the 1,000 watt rating is fairly accurate. These two 1,000 watt amps will be powering 2 12" first gen kicker solo baric L7's in a ported kicker made box, and just paired with the factory sound system. These will be going in a 07 acura TL type s. With that set up im wondering if ill need a power cap (would rather not), or upgraded battery/alternator, etc. If i can get away with out anything other then good gauge wire. I would rather save my money, but not sure what would be necessary for this set up.

Davey Breedlove from Frederick

I have a Rockford Fosgate T500/1bd amp and will be running it in parallel to power 2 JL subs. Would I need a 4 or 8 gauge wire kit?

Kevin from Thornton,co

Dual amp set up. I have a Kicker CX300.1 and KX400.4. If it maters CX300.1 with 2subs Kicker DC12, KX400.4 with 2 KSS650 and 2KSC650. What size amp fuse do I want to use? What size power and ground wire should I use? Distribution blocks on negative and positive or just positive or non? If distribution block what wire size before and after blocks. Do I need a capacitor?

will from phoenix

hi there buck, its will with the scv7500. i currently have 300 amp fuses in it that keep blowing (even though connections are good). my math was saying around 225 amp fuses as well but id blow them almost instantly upon any clipping indication. im wired at 0.5 ohm load currently and the amp handles fine at that ohm load. so do you suggest 225 amp fuses on 6 runs? or 3 runs?

will from phoenix

hi there buck, im running a scv 7500 (clamping 9.5k rms at 13.8v) with 6 1/0 inputs (3 of each), and i was curious as to if i should be using 370 amp fuses or run duel inputs into each one being a total of 12 inputs (6 each) and have them run 300 amp fuses each. im not exactly sure how to go about that but if you could help please :) thanks so much!

Matt from St. Peter's

Mr. Pomerantz, I just ordered speakers that are 100w continuous rms/200w peak and will be running an amp at 4ohm 125w per channel (4 chanels). If my battery is about 4 foot away from the amp, will 8 gauge be efficient? Also will I need to replace the factory speaker wire for these more powerful speakers or will I be able to re-use them and just purchase an amp wire kit to install my new amp? I bought all the equipment, just need to figure out all the wiring I need to buy. Thanks!

Jacub from Missouri

So if it's a monoblock power acoustik RZ1-2300D amp I'm unsure the size wire I have run it's rated at 1600w but I also bought a different wire gauge that's 4g but it's 2800w but it's smaller than the wire I have now would you recommend using the thicker wire and saving the 4g for future use I'm pushing 1400w at 2-ohms ATM to one speaker but I'm about to add another speaker so would you reccomend recalculating my amperes even though it's a 1-channel amp or keep it the same calculations since I'm gonna be running 2 speakers at 4-ohms. The amp runs 900w rms at 4-ohms not sure if I should double that showing there is 2 speakers would they be pulling 900w each or together?

doug from phoenix AZ

Mr. Pomerantz, your articles are pure gold. That is all I wanted to say. Thank you for such clear and excellent writing.

Shawn from Providence

What gauge speaker wire would you run from a 2500 watt amp?

Justin from Irvine, CA

THIS is a proper write up for wiring car audio. I did my homework in high school so I wouldn't catch someones car on fire. But this was an amazing refresher! Thanks Buck!!

Steve from Joliet

Can I use a 8 gauge wiring kit for for the kicker zx550.3? Will be running Rockford fosgate prime 5.25 in doors, one JBL GT5-15 in trunk. Run from battery to amp less than 4 feet away, battery is under back seat of a 2000 Buick lesabre.

Luis Guzman from New Britain

Quick question just to male sure my math is correct. I'm planning on running 2 rockford fosgate power 1000a2 @2ohms bridged (1100rms×1 per), Rockford Fosgate power 800a2 @2ohms stereo (400rms×2) & another rockford fosgate power 800a2 @4ohms stereo (200×2rms) in an excursion (20ft long bumper to bumper). Using your equation 1100+1100+800+400=3400×2=6800÷13.8=492.75 1st; is this correct? 2nd; there's nothing higher than 300 so?

Kelcey from Fort Leonard Wood

By my calculations I need 1/0 gauge wire because my number was 289. Could I run 4 gauge from my alternator to my second battery then 0 to my capacitor and amp from the battery ?

Zach from Ocean springs

I am running two 12's rms 700 watts each and 1200 peak. I am running off a mono block amp into one input inside my box then it runs from one speaker to the next. What gauge speaker wire should I use for this setup?

katlego from sasolburg

Good day I just bought a 7000w Targa sub and 10000w amp,so need to make a good sound what cables,fuses and capacitors should I buy in order to get the best sound and good power so my sound can be clear and good

cody from Plymouth

So I am looking at an Ascendant Audio Havoc 15 inch 1500W, dual 2 ohm, will wire in parallel to produce 1 ohm, planning on using AMPERE AUDIO AA-2000.1D amp; single channel, 1-ohm stable @ 2 KW. Firstly is this a good match up? Secondly, what are your recommendations in regards to vehicular upgrades, if necessary? All is stock as of now. (Vehicle is 2005 Toyota Rav4)...one more thing, I planned on a ported box tuned to 32 hz, again, any recommendations...I love SQ, but I do like volume as well. Input from someone as knowledgeable as yourself would be a blessing, thank you!

Leon from Duluth

I have 2amps I'm installing sub amp is R500X1D prime and my doors is is planet audio RC800.4 I ruining 4 gauge from battery to distribution block would it be ok to run 8gauge from block to amps runs from block to amps is less than 2'' also do I need to fuse each amp from distribution block to amp on my 4 gauge to battery is 100 is this sufficient or do I need go larger

Chris from Texarkana

Buck, I recently purchased 2 of the Rockford TOd412 subs, I will wire them for 1 ohm impedance to the amp, according to the Rockford power cube test the Power series t1000 at 1ohm will provide 1390 watts of power and the t1500 power series amp would do 1712 watts of power. The RF T0d412 is rated at 700rms/1400 peak, my question is which amp would be more sufficient to power this pair of subs? I'm afraid if I get the t1000 running those subs at 1ohm would overburden the amp, on the other hand the t1500 would be 125 watts over their rims.thanks for your help

Nathan Johnson from Clewiston

If I'm running a 12 inch sub that produces 400 watt RMS and 1500 watts Peak with a 450 watt amp. Will 8 gauge wire be ok?

Gavin from Mountain ranch

I have a 2400 watt 2 channel amp for 15"s .what gauge power wire should I use.I currently have a 6awg wire installed.is that enough

Shawn from Orange

I am running an Alpine PDR F50 to my JL components and a PDR M65 @ 2 ohms + JL line driver to a SWR 12D4. I have some 1/0 power wire that is CCA instead of OFC. Am I ok using the cheaper wire in a larger size such as this? Is the chart you provide for OFC or CCA wire? Will be running about 10-12' of the CCA wire to a dist. block and then 4 ga OFC wire to the amps.

Pankaj

How can I know the power and speaker cable size (awg) of my stock car wiring to its connector? Is a Ford Aspire 2016 (Indian Model) Is there commonly used stock wire sizes in cars? I plan to use a 110W RMS amp (without any head unit) and I doubt I need additional power wiring. But want to be sure instead of planning to fry my car wiring.

Chris from Boise

I am getting ready to install 3 amps in my 97 Ford Explorer. I am going to be running an Orion Cobalt 8001 to drive a pair of 10" 4 ohm subs. An Orion Cobalt 3002 to drive a pair of 4 ohm components in the rear doors and a Rockford Fosgate P200-2 to drive a pair of 4 ohm components in the front doors. According to my calculations, 300+120+148=568x2=1136 divided by 13.8=82.32 total amp draw. At a distance of 12 ft. it shows I should run 6g or 4g. Since I already have 4g on hand, I'm going to run the 4g. My question is, should I run 4g off the distribution block to each of the amps as well as from the battery to the distribution block?

Brandon from Dallas

What kind of wires do I need for 2 sundown Zv5 15s 2000w rms rated, and and an Ns-1 6500 watt rms amplifier? I'm going to get an XS battery but I'm still deciding which I should get

George from Concord

Hey Buck, hoping you can help clarify something for me. I'm installing an Alpine MRV-M500 that will be driving 2 JL Audio 10's wired in parallel to present 2 ohms to the amp, so 500 Watts RMS. I'll also be running an Alpine MRV-F300 for my front and rear channels, which will be 50 Watts RMS x4 channels so 200 Watts RMS. Based on the formula above, I'm looking at total current draw of 101.4 amps which means that for up to a 16' foot run, I should be fine with 4 gauge from the battery to the distribution block. My issue is, Alpine is recommending 2 or 1/0 AWG for any run over 3 feet for the MRV-M500 and 4 or 2 AWG for longer than 3 foot runs feeding the MRV-F300. Based on the chart and formula above, I would think I should be able to run 4 AWG to the distribution block, then feed 4 AWG to the MRV-M500 and 8 AWG to the MRV-F300 but that contradicts what Alpine has in their manual. Which one is correct in this scenario?

Derek from San Jose

I am trying to figure out the correct gauge wire to connect a single 4 ohm 400rms subwoofer to a crunch gpv1100.2 amplifer that has these specs 2 x 250 W at 4 Ohms, 2 x 500 W at 2 Ohms, 1 x 1000 W at 4 Ohms Maxx Power. I am not sure how to wire the speaker to set the correct ohms to make sure it will run properly with the amplifier I have, and I am not sure what gauge i need .

Ahmed from Sydney

Hi There, I have 12 AWG speaker wire, is it safe to connect these to my sound system: AMP: JL Audio XD700/5 v2 Components: Jl Audio ZR650CSI Components Sub: JL Audio 10W3V3-2 Just wondering if this will cause any harm to my sound system

SHAUN

Hello Buck, I have POLK PA D4000(125RMS @4OHM) and JVC KS-AX3101D (400RMS @2OHM). So, as per the calculation 900RMSx2=1800/13.8=130. As per the chart, I may need to go ahead with 4 gauge considering the length of wire. But the recommended gauge for the POLK amp seems to be 0 gauge. Can you please help me with which one should I go ahead with? Thanks so much!

Jerry from Poteau

Thanks for your reply buck. I guess I need to rewire the subs to maybe 4 or 8 ohms then. Ill get right on that as I have not pushed it in the slightest yet. And thanks for your help. I used to be good at this stuff when I was 16 but now? geeze.

JD from Poteau

Hello Buck. I will just try to describe how I hooked up my little old school set up and see if you see any issues. As I am kinda new at this at the ripe age of 54. 4 gauge from battery to fuse block @12" to Rockford Fosgate 400 A4 and a 4 gauge ground to body. I had to reduce this down with a block at the amp because the amp only takes 8 ga wire in the terminals Amp is rated at rms50watts @ 4 ohms or 100 @ 2ohm and thats hooked up to 4 channels of 1ch each l &right to rms100watt 4 ohms mids and 2 tweets in front and 2 100amp 4x7 4 ohms in rear doors on the other 2 remaining channels I then used passed through to a second Rockford Fosgate 250a2 amp in back (about 4 ft) with 8 gauge power wire. I bridged both channels into one and use 4 -8inch 8ohm subs wired parrallel to I think 2 ohms(might be 4ohm). I used all 12guage speaker wire throughout. Did I get it right or need to change a wire size? I think with both amps I am about 625watts total and they are about 57% & 59% efficient. This gets confusing to me sometimes. Stock battery, no capacitor and a 105amp stock generator.

Jimmy from Glendale

I bought the RF Prime 300x4 amp and the Kicker 8AWG kit (OFC wire) and when I received the amp, it had a sheet from RF inside saying it actually tested at 403 watts. Now I am concerned I need the 4AWG kit rather than the 8AWG. I am running the power wire approximately 7 feet.

james from Romance

I have a 4000 watt rms massive audio amp and a 800watt pb 4 channel for mid and highs 300 amp alternator and 1 100ahr battery what Guage do I need to use battery is in trunk next to big amp 0 Guage running from alt to battery 17 ft mid amp is running of starter batt 4 Guage wire

Mike Greenwood from Bryant

My receiver block has like 18 gauge wire. Can I use 14 or 12 gauge wire to take it to the fuse box or should I just by some 18 gauge wire and keep it the same? I'm just hooking up a basic system with 6 x 9 speakers for now.

George from Gallatin

How does the calculation change with D class amps, for example, If I run a Pioneer GM-D860, what is the calculation change then? Do you just go one step down or is there a conventional position for the conversion number? (ie. instead of 100%, 50% for the addition.)

Jone Yohannes from Beltsville

Hello, I have infinity primus 6.5 and 6x9 as well as a infinity 1260 subwoofer. I think my math might be off but I arrived at 460 amps which isn't listed. Could you please advise? Thanks.

Colin Neighbers from St Augustine

So I have a 400 watt two channel amp for my mids, 300 watt two channel for my highs, and I will be getting a 2400 watt mono for my subs. I plan on getting a new alternator, around the 220-270 amperage range, and maybe even a second 12 volt battery. I know that I also need to do the big 3 upgrade and I'd like to use 1/0 for that. What do I need to do? Still sort of just getting into car audio. I want to be able to push my subs to their full 2400 watt capacity without causing damage to my alt or battery(ies). Any help and suggestions would be very much appreciated. Thanks.

Chris from Texarkana

I am pushing a Rockford T0 4ohm with a Rockford punch 500 mono, the speaker is rated 600 rms, the speaker is wired to 2ohms so I think the speaker is getting 250-300 watts.Should I go with a bigger amp? And if I did would I really notice the difference? Thanks

Christopher Ramirez from La puente

Please i need a response to this question. For my amp i am using 2 gauge power wire and 0 gauge ground because i had it laying around. Will this affect anything?

DJ from Newport News

Buck, my apologies. Front the battery to the seats I'm guessing 3 to 5ft but no more than 5ft. And from amp to amp no more than 2ft. I don't have exact measurments.

Clay from Gallatin

Is there a Diffrence in sound quality between using thhn 8awg vs fine stranded car audio 8awg wire? Other than being flexible,Are there any other advantages of using fine stranded cable? Thank you!

DJ from Newport News

I'm running two apms. One under the passenger front seat & the other under the driver seat. One amp is a Power Acoustic GT4-900. That's a 900w 4ch amp. 4 x 75w @ 4 ohm 4 x 95w @ 2 ohm 2 x 190w @ 4 ohm bridged I'll be running (4) 6.5" Power Acoustik mid Bass drivers that are 4 ohm 300w peak each & 100w RMS. The second amp is a Memphis Audio 16-MC1000D mono block RMS Power (4 ohms) 300 watts x 1 channel RMS Power (2 ohms) 600 watts x 1 channel RMS Power (1 ohm) 1100 watts x 1 channel Peak Power Output 2200 watts I'll be running 2 shallow mount 12" SD-2 Sundown Audio 2ohm rated @ 500w RMS. Also, will be running a distribution block. Any help on what gauge wire to run from battery to block & block to amps??

Jose from Va Beach

Im planning on running a dual amp system an Alpine MRV-F300 (4x50rms @4ohm) and a Rockford Fosqate 1,200 watt amp (1200rms @1ohm). My question is will a 4 gauge power wire at 6 feet hooked up to a distribution box and splitting with 8 gauge going to the 1200 watt amp at 2 feet and 8 gauge 5 feet going to the Alpine MRV-F300 amp will be sufficient? if not, what do I need to change?

Brett

I have a Kenwood KAC-8104D Mono subwoofer amplifier rated at 300 watts RMS x 1 at 4 ohms (500 watts x 1 at 2 ohms). It recommends 8-gauge power and ground leads but if I did the calculation right I need 4-gauge because I will be wiring it for 2 ohms. Im using this amp to power a JL Audio 12W6v2-D4. Should I use 8-gauge like it recommends or bump up to 4? -Thanks

Greg from Clarion

Greg again!! I also forgot to ask about the REM wire from my head unit and the RCA cables!!! Someone said I can't run a memory wire from my head unit and split it to both amps cause I'll burn out my turn on circuit in my head unit? True? If so what else can you do? Also the RCA cables from the head unit the amps do have input and out (slave and master) so I can run the RCA from my head unit to the input (master) to one amp then with a second set of RCA cables run from output to the input (slave) on the second amp? Correct?? I believe that is it! If anyone could answer these it would be so greatly appreciated!!! Thanks!!

Greg from Clarion

Someone please help me!!!!!!!!! Okay listen I have 2 RE subs running at 2400 rms together! I can't find a single amp to run them unless I pay $1,400 which I refuse to do for an amp! So here is the deal guys I haven't found one good solid source of people for help!! Cruthfield has amazing diagrams I follow for everything so I'm praying there is help! I will be running 2 amps! I found an amp that is 6000 Watts (means absolutely nothing) 3000 rms but CEA rating at 1000 rms wired to 2 ohm which I am the subs are 2 ohm! So I need 2 amps I'm gonna run together so I get true 1000 rms cea rating for each sub! Question! What size power wire kit do I need?? With this chart I get confused on what rms power to go by the 3000 or 1000???? Which makes a huge difference! Would I go with a 0 gauge kit or 2-4??? Ill be running a fuse from the battery to a fused distrubtion block to run the amps so I need to know what size wire and also what would be the best fuse size??? Sorry so long just wanna be detailed in case someone can give me a straight answer which I've had absolutely no luck on!!!! If you can please give me any of this information it would be truely amazing!!! Thanks!!!!!!

Mike from Salem , nh

Hi , I am installing a Alpine CDE - HD149BT Receiver Alpine PDX - V9 5 Channel Pre Amp ------- 100 watts x4 + 500 watts rms for sub (2) Kicker 500 watts rms each subwoofers @4ohms (4) Kicker 6x9 150 rms each 3 way speakers @4ohms It's being installed in a new 2015 Silverado , so I am isolating this new system from the factory installed system. I have 2 questions for you Hector. I added up the watts for what gauge of wire for the battery and for the block . I came up with 4 gauge wire. I know you said going thicker is better. The amp is 6 feet from the battery. My second question for you would be , the two 12'' subs I bought are higher in watts rms vs my Alpine 5 channel amp , is that a problem , because I was thinking if I have to add a sub amp later , it could handle the rms . Thank you

Juan from Orange County

Hello so if I'm planning on installing a jl audio hd 600/4 and a jl audio 250/1 slash and both combined are 850 rms and according to the equation above I'm pulling about 123 amps. So would i be OK if I run 4 gauge fused main wire from the battery to a distribution block with another set of wires from the distribution block to the amplifiers? And if so what size fuse at the main wire? should I get fused or unfused distribution block? And last should I use 4 or 8 gauge wire from the distribution block to amps? Thanks

Chris from San Gabriel Valley

Heyy I am running 2 kicker cs 4 ohm 100 rms each and hifonics be500.4 what kind of speaker wire should i use and going to use kicker Ks 6x9 in the rear deck i think they will be 150 rms but will wire them to 2 ohms to get more power or bridge ...soo what gauge speaker wire should i use?? Im planning to re wire everything!

Jeff from Gonzales, LA

The MTX TE504amp has (2) 25A fuses, the JBL GTX500 amp has (2) 25A fuses. The LCQ-1 says to use 2A fuse because it only draws 350mA. I have decided to not hardwire the power inverter. I will just get a different one that plugs into cigarette lighter. So now i should only need 4AWG lead wire with a 125A fuse at battery according to chart. Correct? Im calculating 360W+425W = 785W (x2) = 1570W / 13.8V = 113.76A. The MTX amp is AB class and JBL is D class. Also i want to hookup a remote bass volume knob. Should i hook one up to JBL GTX500 amp or hook one up to the audio control LCQ-1? Thanks for your input Buck.

Jeff from Gonzales, LA

I have JBL 6X9's in front doors and JBL 6.5's in rear doors. These speakers are 2.3 ohm. They will be powered by MTX TE404 rated 65Wx4 at 4ohm stereo or 100Wx4 at 2 ohm stereo. So im guessing the door speakers will see about 90W each. So lets say 360W. Then i will have JBL GTX500 which is 350Wx1 at 4 ohms or 500Wx1 at 2 ohms. This will be pushing JL Audio 8w7 ported stealthbox which is 3 ohm. So lets say i split the difference and sub will see 425W. Each amp has 50A total on fuses. So 100A total. I also will have audio control LCQ1 to hook up and i want to hard wire a 400W power inverter. Question 1: What size cable should i use from battery to distribution block? Then from distribution block to amps, inverter and LCQ1. Question 2: What size fuse should I use at battery? Should i also have fuses at distribution block? Question 3: Should I consider usage of an external capacitor for the mono amp or is it unnecessary? If yes what size. Thanks for taking my questions.

DeAndre Wilson from Buffalo

In my Lincoln mkz I'm running a aux to rca cable from my fiio m3 high resolution mp3 player to a distribution block in the trunk its 4 ga wire with a 150 amp fuse. From the block I have 4 ga going to an audiopipe apsm 1500 at 1 ohm doing about 1400 watts rms and from the block 8 ga going to an autotek 1000.4 with 4, 4 ohm door speakers. Sub amp has no external fusing and 4 channel has 30 amp fuse. I have fried my 2nd amplifier on my kicker l7 15 inch (powerbass asa 1000.1 first). I pulled over yesterday and both amps where scorching hot to the touch and now the sub amp is stuck in protect......any thoughts?

Matt

All power/ground connections are clean and tight. The amp is grounded to the back of the cab.-amp is mounted to the cab behind the rear seat- Just to add, with the truck running the lights will dim. If i turn the engine off and have the key to the acc. position the light do not dim. Not sure why that would be? I hate to admit this but, the 6 gauge amp wiring is Scosche brand from Wal-Mart. Thanks

Matt

I have a 2006 Silverado it has a 145 amp alternator. I have a Kenwood KDC-X399 headunit- one Kicker 40TCWRT104 subwoofer hooked to a Planet Audio P300.3 Amp (specs, bridged power 4 ohms 600 watts/outout power 2 ohms 302 watts). The subwoofer is bridged-subwoofer is hooked to left channel negative-right channel positive. I have 6 gauge power and ground wire, the length of the power wire run is around 10-11 feet . My headlighs and dash light dim when the bass hits. I have tried to "tune" the headlight dim out using 0 for bass setting and the gain on the amp turned to 50% and subwoofer setting 0-5. Seems no matter what setting, if the bass hits to where the music sounds good the lights dim. While the lights dim I hooked a multimeter to the battery, and the voltage bounces from 14v to 14.8 volts. I installed a 160 amp alternator and still have the dimming lights. The battery is a ACDelco 600CCA, and currently the truck starts without any problems at 0 to -5 degrees so I think the battery is good. Any suggestions?

Jesus

I have a 1,200W AP09512 SDX amplifier with 5 channels. I want to install it but i don't know what gauge to get.

Grant Cobbs from Raleigh, NC

Hello, im running 2 860 watt subs on my 600 watt amp, my friend has the same setup and its working fine, i dont know if its my wiring or what but my amp goes into power protect mode. (Im pretty new to subs, so, bear with me)

Cedrick d spearman from Memphis tn

I've sound ordnance b24 and I want to hook it up to a boss riot 1100 class a/b mono block,what gauge of wiring I need?

Benn from Toowoomba

What gauge wire would I need from an amp to a 1600w speaker?

Tanner Christensen from Casper Wyoming

This makes no sence to me, I have a Boss R3002 600 watt amp 2 channel what is the RMS and how do I find it

Jim Davis from El Centro

I' m wiring a 1970 Dodge Challenger for two smaller amps (320W RMS & 250W RMS) using 4ga cable according to the chart on this site. For added peace of mind I want to run a 4ga ground cable from the battery to the amps in the trunk. Are there any concerns with wiring things this way, or is it just good overkill?

Louis from Montreal

Hi M. Pomerantz . I just bought a used amp in mint condition, it's an Alpine MRV- F450 . On Crutchfield website they recommends 8 size for this amplifier. Knowing that I do not intend to add another amplifier in the future and that all the speakers (4 x 6in + 12in sub) are at 4ohm , is size 8 will be sufficient for the amplifier . Also, what fuse resistance should i use near the battery pole. Thank you!

Maxwell

What if I have 2 amps and they are both connected to the battery through separate power cables? Would I calculate each one and see what gauge wire I need for each power cable for each amp?

Wayne from Convent

I have a 500watt Sony Xplod 4/3 channel (high/low) XM-504Z amp! I need to know the wiring size to connect one 10in Sony explode speaker 1100watts

Innes from Kathu

Good morning guys I have a question I just recently installed a system in my 2015 Vw Polo 1.2tsi hatchback I'm using the standard head unit so I used 2 audiobank high to low converters for the 2 amplifiers I am using. I'm using a 4 gauge wiring kit from Starsound audio the car is roughly 11ft long the first amplifier for my subwoofer is a TG-10000d1 Targa monoblock amplifier rated to 2500 watts RMS at 1ohm stable the subwoofer is a Targa TG-VM7000 dual 2ohm voice coils rated to 2500watts RMS 10inch the second amplifier is a XTC audio da brat series 3000 watt 4 channel amplifier which I'm using to run the standard door speakers and works perfectly but my problem is the mono amplifier if I plug in both RCA leads into the amplifier it totally stops playing the woofer the woofer is wired to 1ohm so that it can run if I remove 1 of the RCA leads it starts playing again is my 4gauge wiring enough or should I go to 0gauge because I veel it should be playing louder and stronger could you please give me advice as what to do

Ryan from norco

Hey Buck, I just recently installed my system in my extra cab Toyota pickup. I have two 12 inch kicker comp subs. I purchased a kicker dx 250.1 amplifier to run my subs with. I also have a a 350 watt ken wood amplifier running to two 6x9 speakers in the truck. I have about 7 feet of wire from the batter to the amplifiers. I have a friend with the Same system as mine and the only difference is wire size. Tried doing the math but got really lost in the mumbl jumbo any well you could help determine wire size for me? Also with two twelve inch kicker comps would you recommend a large or small box? Sealed or ported? The subs sound crisp but I'm looking for more low end hard bass.

Randy from Missouri City

Hey Buck, Just wanted to verify my setup is correct. I am running two amps; Pioneer GM-D8604 and a GM-D9601. I am running Arc Audio xRi Components rated at 120w rms @ 4ohms and coaxials at 40w RMS @ 4ohms as well as an Alpine Type R 10" (4 ohm wired into 2ohm) with a rate of 800w RMS @ 2ohm. Now this may be overkill but I went ahead and redid all my wiring as I did not know much about the different types of wires 3 years ago when I installed all this. New setup is 1/0 (1') battery wire with a 200 amp ANL fuse running into a distribution block then to both a 4 gauge w/ 150 amp ANL fuse to the D9601 and an 8 gauge w/ 60 amp inline fuse to the D8604 as per manufacturer specs. On top of that the amps also have 3 (40 amp) fuses and 2 (30 amp) fuses plugged into them. Now my car was made with the battery located in the rear of the car. So my runs are not longer than 8' being the longest which is the 4 gauge for the sub amp. Thank you for your time.

Valente Villicana from Vista

I should have made myself clear. The fuse did pop and its been popping ever since. Im running a cheap 4 gauge wire to the trunk. Its not real awg wire thats why I figured I should go bigger with a 2 gauge to the distribution block and from there keep the 4 gauge to both amps. I have the 500/1 Jl Audio Slash series amp and the alpine MRP F 300. Can I run a circuit breaker instead of fuse?

Valente Villicana from Vista

Thanks for responding. I have a 500/1 Jl Audio Monoblock with a Jl Audio 10inch W7. And an alpine 300watts.4 channel..i was thinking of running 2 or 0 gauge from the battery to the distribution block in the trunk and from there keeping my true 4 gauge wires to the amp. As far as fuse I was thinking of replacing it with an 100 amp circuit breaker. What do u think? I feel like my 4 gauge power wire running out the battery is too small for all the current im drawing from both amps thats why it melted.

Valente Villicana from Vista

I have a 2001 toyota corolla. I installed a no name brand 4 gauge power wire from the battery to my stinger non fused distribution block in the trunk. From there I have two 4 gauge wires my amps. I have an alpine 300.4ch and a 500.1 jl audio powering a 10inch w7. I also have AudioControl Epicenter hooked up. I recently melted my power wire right at the inline AGU fuse connector. So now Im debating whether using 2 gauge or 0 gauge from th battery to the trunk and using a 100 amp circuit breaker or clip style 100 amp fuse block. What do you suggest I do as far as install and gauge size? My downfall to my install is when I blow a fuse I lose all sound since Im only using one power wire with a distribution block for both amps. Thanks in advance

Mark Ford II from Montezuma

I'm running a 3400 watt amp with three 4 ohm 12's. The manufacturer claims 2550 x 1 rms @ 1 ohm, 1275 ×1 @ 2 ohms, and 638 x 1 @ 4 ohms. It's a 2014 impreza hatchback (on the small side), so just with an estimated wire distance, can you help me out here?

Brandon from seattle

Thanks for the information, Buck. Unfortunately, you guys have some conflicting information right here on your website. Here is a quote from your amp article where the question is asked "what size fuse do I need for my amp"? [Link to Car amplifier FAQ] Q: How big should the fuse be? A: If you're installing just one amplifier, the fuse at the battery should simply match or slightly exceed the fuse rating of the amplifier itself. Some amps don't come with onboard fuses - you have to find their fuse ratings in their owner's manuals. If you're installing two or more amplifiers, just add their fuse ratings together and install a fuse rated roughly equal to this sum. Generally, it's better to go slightly higher than lower, but a margin of five amperes is acceptable. Say you have three amplifiers, two with fuse ratings of 20 amps each and one with a fuse rating of 25 amps. In this case, you can safely go with either a 60 or 70 amp fuse. Of course, if your system is powerful enough to demand that you install a heavy duty fuse, it's important that your power and ground wire be of an appropriately heavy gauge as well."

Brandon from Seattle

Great article. I think I have this all correct in my head, but i'm not sure. I am now getting conflicting information out there on the WWW in car audio forums. Maybe you can clarify? I am running 2 amps, and driving all 4ohm speakers. One amp is 100x2 rms, and the other is 300x2 rms. The smaller amps says it has a fuse rating of 50a. The larger says it has a fuse rating of 140a. The primary power wire I have run, is a 0 gauge, and I Just need to figure out what size ANL fuse to put in the fuse box. From what I have read here on crutchfield, I simply add the fuse ratings together to arrive at my total, for the power wire up at the battery... which is 190amps. I can't buy a 190a ANL, so a 200 is what I am planning on putting in. Then between the distribution block and each amp, I have planned a 40amp ANL for the smaller, and a 150 ANL for the larger. Correct?

Andrew from muncie

my amp is a mon block capable of 2000watts rms but the power input on the amp only takes 4 guage. makes no sense to me

Walker J from Kelowna

Hey Crutchfield, thank you for all the awesome information. I am installing a Hertz HDP4 amp, it is a full 17 Ft cord length right now. I have 4 gauge Stinger True-Spec, so I think I'm good there. However if I adder another 600 rms Hertz subwoofer, would I still be okay? I'll distribute the 4 gauge at 17 ft, then run 8 gauge to the seperate amps. We can assume my new amp at 600w rms will be Class A/B. My other question for you guys is this, what gauge wire do I need for my Hertz 165XL door speakers? They run 150 rms. Thanks so much for your guys' time and efforts.

James Shanley from Ballwin

Ok I will list components and see what you think. I currently have a run of 2 gauge welding cable ran to the rear kinetik 2000 blue series. From that battery I have the same 2 gauge wire to the amps is this good enough? Second I just bought another t1000.1 and was wondering if the kinetic 2000 is enough and is the 2 gauge from the front battery good enough? I have a stock 130 amp alternator by the way

Haden wilson from Eatonton

I have 2 alpine type r 10's that are dual 2 ohm voice cool subwoofers run off a pioneer 2400 watt amp. Would 4 gauge be efficient enough to power the amp? Secondly I am thinking about swapping the 2400 to the planet audio 5000.1 to run at 2 ohms to send roughly 1250 watts to each sub, will I have to swap the wiring out to a larger/thicker wire?

greg street from oronogo mo.

i have an older 600 watt alpine mono amp. and i was wondering what size fuse should i use on the power wire. im just running a type r 12 in. comp sub. alpine also i am using the biggest power wire the stereo shop had which is big but not sure what gauge it was. its clear coating on wire

Ryan Reeves from Galveston, TX

Mr. Pomerantz, I have installed a Rockford Fosgate R1200-1D pushing two Rockford Fosgate P3D4-12's wired at 1 ohm. I recently "melted" the power wire where it connects at the fuse holder. Not between the battery and fuse holder. But after the fuse holder leading out towards the amp. The fuse holder showed signs of heat and the wire in the clamping part/set screw of the holder was brittle and broken. The wire is true AWG A spec size 4 gauge for power and ground (Lightining Audio LA-4i Amp Kit). Could you please point me in the direction of potential causes? I'm positive that I have a good "solid" ground with all paint removed. Do I need to drop down to a -0- gauge kit, or larger if necessary? Thanks in advance for your wisdom.

Josh Holohan from Isle of Man

hi there i have a set of vibe qb69 at 200w rms each and a sony explode 12 inch sub at 350 watts rms and was going to buy an amp which is 1000watts rms (Lanzar HTG447) would a 8 guage wiring kit fitted with a 60A fuse be okay to power it the amp is fitted with 2 25A fuses Many thanks Josh

Ryan from edmond

Hello, I am purchasing a new setup and I am interested in setting them up myself. see if my research is in balance. I purchased 2 Pioneer TS-W3003D4 Champion PRO 2000 Watt MAX 12" Dual 4 Ohm subwoofer + Pioneer GM Digital Series GM-D9601 2400 Watt Monoblock Class D Car Amplifier. Based on the chart I stand within the 4 gauge or 2 gauge wiring for my subaru wrx.

frank from Riverside

Question: I'm going to atemp to rewire my old car and go from 6volt to 12volt what gauge wire do I use or can I use the 14 gauge wire from when it was wired before?and just change the bulbs,coil,battery and to alternator.

cameron from richmond

I have a question I have two 12 pioneer pro champion series subs there rated at 2500 watt peak an 1000rms I also have a 5500 watt power acustic amp not sure what it's rms is was woundering what wire I should use to wire it in correctly

Ragnar from Tórshavn

I will be running a JBL GTO-5EZ with my factory head unit using a low line converter. On JBL's website it says that the peak power is 1935 watts. This means I will be running 280 amps, and would 2 gauge wire be enough?

Shawn from Columbus

After reading this I thought about getting new thicker cable. But after doing some digging and getting specs on my amp fuse and fuse in the holder, my issue became no concerned. After some thought it wouldn't be ideal to run 0 Gauge wire. According to the steps to figure your amperage there is no way that calculation is correct. The calculation states in pulling 159 amps, if that is so, then my 100 anl fuse in my power cable would have 'popped', and or my amp fuse of 80 amps would've as well. This calculation is just a calculation, to accurately find your amperage being 'pulled' a multimeter is your best bet to find the truth. I am running a Hifonics bxr.1116.1d on 4 gauge wire, wired in a 1 ohm load powering two NVX VCW124's. I have two power capacitors an 8 farad Soundstream and a 1 farad NVX, but the capacitors won't affect amperage being pulled. Plus before I installed the Caps no fuse blowing was occurring. My wire is not cut down due to having the Caps and I actually added an extra 5 feet or power and ground to accomodate both caps for placement. So realistically I have approximately 23 feet or power wire.

Joshua from Los Angeles

I have two 4 Ohm Alpine Type R's, wired down to 1 Ohm with a 1900.1 Brutus Amp, with 4 gauge lead and ground wire , with a 300 amp circuit breaker , my amp only has two 60 amp fuses in it , should this give me any problems ? Or would it be fine as long as the amp isn't using the full 300 amps

Jason from Idaho Falls

Thanks, that was a far faster response than I had expected. I'm just adding a bit of punch to the already existing stock sound setup. I likely will sell the car with the amp in it. There were a lot of factors that went into picking something that would sound nice and not overpower the stock speakers. I will likely be using this amp at no more than 35% volume tuned in relation to the factory setup.I was thinking that Boss was being a bit generous with their spec but a second opinion doesn't hurt.

Jason from Idaho Falls

Just checking my math and making sure I'm not going to melt anything in my pretty black 2009 Impala LT. I have an AR1500M Boss amp rated at 1500w peak and 700w RMS running at 2ohms on an Infinity 12" sub with 2 voice coils at 4 ohms at 2500w peak. I'm not sure what the RMS is but I' was thinking it would be underpowered. I have a BOSS Audio KIT2 8 Gauge (sold bundled with the amp) run through the car and I didn't trim any yet but there is a good 6Ft of cable left in the trunk. Haven't hooked anything up yet... My question is this... Will that cable safely handle the power output of the Amp/sub combo Or am I looking at getting something a bit more substantial? Let me know if I missed any details.

Ryan from Louisiana

I have an amp and aftermarket door speakers that were already installed in my truck when i got it. No idea what brand, wattage, or impedance the speakers are. Amp is an outdated Alpine 4 channel that puts out 70rms/channel at 4 ohms and 100rms/channel at 2 ohms. I just ordered 2 P1 subs with 250rms and a 500rms amp that should push full power when wired at 2 ohms. My question is how do i tackle wiring these systems when I don't know what one really is but know exactly what I need for the other? And would it matter if the old amp is set at 4 ohms and the new one is 2? I know speakers of different impedance cant be hooked to the same amp but not sure if it matters that two amps are set differently

allen from lansing

Okay I have two amplifiers in my car. I have one 2000.2 autotek amp. 1000 watts per channel or bridged 2000 watts at 2 ohm steady. I went through a lot of problems thinking I had smaller wire because my protect was going off. Now I have 2 gauge lead power with 4 gauge ground. ( turned out a speaker was blown. Second I have a old black lanzar 2100 optidrive competition and with a 45db boost. It is running bridged mono. That runs on same ground but a 6 gauge lead wire. I want to get rid of wires. Can I run both the amplifiers on the same 2 gauge wire running to there full capacity even if I have to But a capacitor and if so what fared? I have been told by a friend if I run both on the same 2 gauge the wire will not handle both amps. I want to split the wire into a snake tongue to each amp. I own a 2000 dodge neon manual 2.0l. The 2 gauge is 18 ft long.

neville from harare ( zim )

Good day I got a 8000 watt amp and two 2000 watt sub's my distance from batt is about 3 meters can I use a 0 gauge cable with a 3.2 farad capasitor.

David B from Phoenix

I find it hard to believe the typo in the formula on the page. You might want to change the plus sign to a division sign ;)

Dylan

Just to let you guys know... you have "+ 13.8" not "/ 13.8" written for your formula

Ryan from missouri

Should you rate the wires from the distribution block to the amp separately? For example, If you have a two amplifier system pulling 91 amps with 12ft of cable you need 4-ga from the battery all the way up to the distribution block. Once you branch off, the amps are pulling 43 and 48 independently. At 4 feet does this mean it only requires two 10-ga wires?

Joey from US

I made the mistake of buying a cheap walmart brand wire, I originally ran my 1600 watt amp with a 1200 watt power wire, but i sold the wire along with that jeep, So i put my 15" L7 and 1600 watt amp in my truck and thought i could skirt by on that, I just blew 3 fuses in the last 5 minutes, 2 80 amp 1 100 amp. I figure it to be the wire cause the amp works just fine... So what gauge wire should I be using?

mike johnson from champlin, MN.

I have installed a 500 watt amp that is 25 feet away from the CAP, it is driving two 12 inch subs and seems that i have installed the wrong power supply wire to the AMP can you help me? and do you have the wire size in stock? will need 30 feet

Blake from Colorado

Great information here, but I am still not sure which gauge to use. I have an AudioBahn A4002T amp that will be going into a 97' Subaru Impreza Outback Sport. Its also about 14' long bumper to bumper so my length would prolly be much shorter than that. The Amp's manual says this: 800 watts ACH Power 100 watts x2 @ 4 Ohms RMS Power 200 watts x2 @ 2 Ohms RMS Power Also tho this website: [Link removed] said that it has an "Output Power / Total: 400 Watt" hence the confusion. Could you clarify on what gauge I would most likely need? Thanks, Blake

gregory from jamaica

hey good day guys i just check my system using the calculator and from what i am seeing is i will be drawing about 400+ amps. i had run 2 gauge wire from my battery to my distribution block and on the chat its saying i should have 0 gauge wire,, could i run another 2 gauge wire from the battery to the distribution block or do i have to change it out and get the 0 gauge

Hector Perez from United States

how far I have to install my fuse to my amp?