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Crossover/equalizer installation guide

Tips for a successful install

AudioControl EQL

AudioControl EQL 13-band equalizer

This installation guide offers examples of crossover and equalizer (EQ) installation types and suggested system layouts. The installation of your crossover or EQ will depend on the make and body style of your vehicle as well as the equipment purchased.


Tools needed, depending on vehicle

A note about wiring: In addition to the tools listed above, your equalizer or active crossover installation will require power and ground wiring, plus RCA cables, terminals, and a remote turn-on lead. The easiest way to get all of these items is in an amplifier wiring kit, available at Crutchfield.

You can also download a pdf of the Crossover/EQ Installation Guide. Note: To view this file, you will need the Adobe Acrobat PDF reader (free download).

Passive crossover

The passive crossover from a set of component speakers


Passive crossovers:

A passive crossover steps into the signal path after the amplification. It's a capacitor or coil usually installed right on your speaker lead. A passive crossover comes with every pair of drivers in a set of components, sometimes mounted on the speaker's frame.

Crutchfield also carries passive high-pass crossovers, called Bass Blockers, that clean up the sound of midrange speakers and tweeters by removing the low frequencies. They get installed by the speakers and use the factory wiring with standard quick-slide connectors.

AudioControl EQX

AudioControl EQX active EQ and 2-way crossover

Active crossovers:

Installing an active crossover requires a little more work. You have to connect 12-volt power, ground, and a turn-on lead. The active crossover gets installed between your receiver and your amplifier. (Many active crossovers have both speaker-level and preamp inputs, so they can usually accommodate either type of connection.)


Like a crossover, the equalizer gets installed between your receiver and your amplifier. And like a crossover, an equalizer needs power, ground, and turn-on wires. You'll find equalizers that are designed to be installed in the dash, above or below your receiver. These might require custom installation work. Other equalizers are designed to be mounted in a remote location, like the trunk. Either way, the wiring connections required will be the same. To install:

1. Installing (active crossover or equalizer):

A remote-mount equalizer or crossover can be securely mounted with just a few screws. Anywhere between the receiver and the amp is fine. Most people mount the device in the trunk near their amp, especially if you have more than one amp. This also makes it easier to add additional amps later. You should mount it where it will be easy to get to so that you can make adjustments without too much trouble. Don't mount your equalizer or crossover directly on steel — you will invite noise problems. Instead, install it on a non-conductive board and attach the board to the car body (or use rubber grommets under the screws to isolate the chassis).

Locate the remote turn-on lead

Locate the remote turn-on lead behind your radio (usually a blue wire).

Connect the turn-on lead from your amplifier wiring kit

Connect the turn-on lead from your amplifier wiring kit to the blue wire. You can wrap the bare wire ends together and cover with electrical tape, or use solder.

2. Making the power connections:

  • To obtain 12-volt power: Cut a length of small-gauge cable (16 gauge is typically sufficient) long enough to reach from the EQ or crossover location to your vehicle's fuse panel. Strip one end of the wire, and attach it to the device's power input. This may require a crimp-on connector, or bare wire might be sufficient, depending on the equipment you're installing. Route the wire from the device's location to your car's fuse panel. Using a fuse tap, connect the wire to a source of switched 12V power.
  • To ground the equalizer or crossover: Remove a bolt near the mounting location. Crimp a ring terminal to one end of a length of small-gauge wire, and then bolt the terminal tightly to the vehicle's metal chassis. Scrape away any paint and clean the bolt location thoroughly. If you can't find a convenient ground screw or bolt, drill a hole for one — be careful not to drill into the gas tank or a gas or brake line.
  • Making the turn-on connection: In most cases, you can tap into your in-dash receiver's amp turn-on lead to get a turn-on signal for your device. Remove the receiver from the dash to access the turn-on wire (usually a blue wire). For step-by-step instructions on removing your vehicle's radio, see your vehicle-specific Crutchfield MasterSheet™, or read our In-Dash Receiver Installation Guide. Strip the insulation off a small section of this wire coming from the radio. Strip the insulation off another small-gauge cable that's long enough to reach from the in-dash receiver to the EQ or crossover, then connect the two with crimp caps or solder. Wrap the solder or crimp connection with electrical tape to guard against a short. Using wire ties to secure the wire, route the turn-on lead behind your dash all the way to the mounting location.

3. Making the signal connections:

In most cases, you'll be routing RCA cables from your in-dash receiver's preamp outputs to the inputs of your EQ or crossover. While your receiver is out of the dash to access the turn on lead, connect a set of RCA patch cables (long enough to reach your crossover in its mounting location) to these outputs, taping them together so they won't come apart. Route the patch cables (again using wire ties) behind the dash, and to the crossover mounting location.

The best of both worlds

If you plan on using both an equalizer and a crossover together, the order of connection should be:

  • The receiver's  outputs go to the equalizer's inputs
  • The equalizer's outputs go to the crossover's inputs
  • The crossover's outputs go to your amplifier's inputs
    AudioControl EQL

    AudioControl EQL dual 13-band equalizer

  • John Wood from RENTON

    Posted on 6/29/2021

    Can I use the decks sub rca output and/or rear output on deck to connect more amps while having the decks front rca output go to equalizer? Will it work or no? I understand that the equalizer will not be working on them if so. Thanks John

    Commenter image

    Buck Pomerantz from Crutchfield

    on 6/29/2021

    John, If I understand you correctly, that hookup should work.
  • Michael bass from Gig Harbor

    Posted on 6/24/2021

    I'm having issues getting sound to my d.s. component set. Headunit is a pioneer avh521ex. I have rca from front to the input on a skar ska7eq, then three sets of rca 1 going to my master amp ppi 2600.1 which is strapped to same and then 2 sets going to my midrange amp ppi 1000.4 ( front l,r and rear l,r) I have sound from everything but the drivers side front. All connections are proper and shielded, heat shrinked,ect...

    Commenter image

    Buck Pomerantz from Crutchfield

    on 6/24/2021

    Michael, If you switch the left and right RCA cables and the problem switches channels, the cable is bad. If the problem stays the same, it's probably the fault of the device just upstream of the cable.
  • Mike T from San Jose. Ca

    Posted on 3/19/2021

    Hey there, I just installed a Clarion EQS755 7band in my car, all is well except for my subwoofer output on the EQ,, I'm not getting any signal from it. I've got the main rca's plugged in from my FRONTS behind my headunit to main input on EQ,, 4channel rca going to 4channel amp for my doors .. but just having a hard time with subwoofer outs??.. can someone please help !!

    Commenter image

    Buck Pomerantz from Crutchfield

    on 3/30/2021

    Mike, You say you have a 4-channel amp for your door speakers, but nothing about a subwoofer amplifier. The EQ can't drive a sub by itself, an amp is required.
  • Moses from Portland

    Posted on 3/15/2021

    How to i hook up my eq to my amp that has only one output and one input

    Commenter image

    Buck Pomerantz from Crutchfield

    on 3/31/2021

    Moses, I can tell you that the EQ connects between the receiver and amp. Without knowing precisely what EQ, receiver, and amp you're referring to, we can't 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.
  • Dana from Scarborough

    Posted on 11/14/2020

    Good day. I just installed an LC2i and would like to add my equalizer, a Planet Audio PEQ-10. According to the equalizer specs, its max input is .5 volts, output is 7 volts maximum. It will be feeding an MTX 4 channel amplifier, and a Kenwood mono amplifier. Will the equalizer's low input voltage be a problem or a hindrance given the high output capabilities of the LC2i?

    Commenter image

    Buck Pomerantz from Crutchfield

    on 11/15/2020

    Dana, Just turn down the output level of the LC2i and you'll be fine.
  • Tusiata from Sydney

    Posted on 3/26/2020

    Hi I got a pioneer eq it has 2 blue wires 1 red and 1 black which of these blue wire is connect to the remote wire of my car radio and what about the other blue wire, do I still use it or not to power my eq..

    Commenter image

    Buck Pomerantz from Crutchfield

    on 3/26/2020

    Tusiata, You might try reaching out to Pioneer to get the owner's manual for your device.
  • Tony from Bsl

    Posted on 2/21/2020

    Why is 2nd battery not charging enough to power kicker 4 ch 300.with kicker cs Have also connected a 4000 autotex with kicker 15 cvr. With eq and ssl xover. Isolater on bteween jeep battery. Should i connect it to the main battery instead of second battery.

  • Tommy pritchett from Lytle texas

    Posted on 2/20/2020

    Where should a epicenter go when using a deck with time alignment and xovers built and front rear and sub outputs then to 4 mono amps a 300 ref soundstream on each door and ref 500 on each sub and a 200 running sterero on rear doors which ill will probably omit thank you

    Commenter image

    Buck Pomerantz from Crutchfield

    on 2/20/2020

    Tommy, The Epicenter's inputs connect to the receiver's sub outputs. The Epicenter's outputs go to the sub amp's inputs.
  • lou from Buena

    Posted on 2/17/2020

    Hello, i have a kenwood kvt819dvd that i am connecting to an audio control eqq, 4xs and 2xs. i believe they would be connected in that order, but im confused about where the sub out rca gets plugged into. I am currently using the rca Front and Rear outs of the kenwood unit to the input of the EQQ , then to the 4XS and finally to the 2xs. I have sub outs on the 4xs and 2xs but no inputs for sub. thanks in advance.

    Commenter image

    Buck Pomerantz from Crutchfield

    on 2/18/2020

    Lou, You don't explain why you want two crossovers in your system, nor what speakers and amps you plan to use. The 4XS crossover has a subwoofer output that would connect to the subwoofer amp's input.
  • Julio from Miami

    Posted on 2/4/2020

    I have a 2 amps mids and sub i also have a crossover what would be the perfect setup so.i get the best out of the system 1 4 chan amp mids/highs 1 chan amp for subs 1. crrosssover 1 stock head unit using rca converter

    Commenter image

    Buck Pomerantz from Crutchfield

    on 2/5/2020

    Julio, Without knowing precisely what equipment you're referring to, we can't 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 correct information to you.