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How to install a powered subwoofer

Learn how to install a powered sub and boost your bass


Robert Ferency-Viars

Robert Ferency-Viars is the managing editor for the Crutchfield car A/V learning content, and has been with the company since 1999. A Virginia native from the heart of the Blue Ridge Mountains, he loves spending time with his wonderful wife and sons, listening to music, writing, and playing games with friends. Robert's love for car audio began at 16 when he installed his first car stereo.

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Powered subwoofers include all the elements of a subwoofer system — subwoofer, amplifier, and enclosure — in one convenient package. Here's a look at how you install a typical powered subwoofer.

Please note: As with any amplifier installation, you'll also need an amplifier wiring kit. The proper size of kit will be listed in the accessories for each powered subwoofer.

How to install a powered subwoofer | Video Transcript

No matter what kind of music you love, adding bass makes it sound better. Let's take a look at what it takes to install a powered subwoofer in your vehicle with the help of one of our guys from tech support.

Find a place to mount your sub
Before you get started, find a suitable place in your vehicle to mount your sub. The sub’s built-in amplifier generates heat, so adequate ventilation is important. And you'll want to place it somewhere that's not too difficult to access.

Wiring kit and speaker wire
Your powered sub does not come with the necessary wiring, so be sure to purchase an amp wiring kit that includes the wiring and fuses you'll need.

Disconnect the battery
First, disconnect the negative battery terminal to protect you and your gear during installation.

Step #1: Running power wire

Next, run the power cable from the battery to the powered sub. Some kits have the fuse assembly already put together. But if not, cut a short piece of the power cable, enough to cover the distance from the battery to the fuse holder location, and strip the insulation off both ends. Crimp the terminal ring from your wiring kit to one end, and attach the fuse holder to the other end. Strip the insulation from the end of the wire that leads to your amp and attach it to the other end of your fuse holder. It’s important to keep the fuse close to the battery since the lead between the terminal and the fuse is unprotected.

In most vehicles, you can pass the power cable through the firewall that separates the engine compartment from the main cabin using an existing entry point. Once you're inside the cabin, tuck the power cable under trim panels or your carpet along one side of your vehicle until you reach your powered sub location.

Step #2: Running turn-on wire and signal cables

After running the power wire, the next thing to do is run the turn-on wire and signal cables. Both the turn-on wire and RCA signal cables need to be connected to your stereo. Run these cables behind the dash to your stereo. The turn-on wire connects to a remote turn-on wire in your stereo's wiring harness. It's usually blue, but confirm this with your owner's manual. Plug the RCA cables into the appropriate RCA outputs on your stereo.

Run these wires, the turn-on wire, and the RCA cable, down the opposite side of the car from the power wire. This will prevent electrical noise from entering your system and spoiling your music.

All of this assumes you have an aftermarket stereo with preamp outputs. If you have a factory stereo then you'll get the signal to your powered sub a different way. You’ll want to make sure your amp has speaker-level inputs and "signal sensing" turn-on capability. In this case, you can just tap into the speaker wires behind your stereo, or possibly the rear deck speakers. Either way, this will get signal to the powered sub’s built-in amp.

Step #3: Connect the ground wire

The third primary connection is the ground wire. This wire should be connected to the vehicle's chassis. Look for a nearby bolt that you can fasten the ground cable to. The ground wire terminal should be in contact with the vehicle's bare metal. Sand away any paint at the contact point for the best connection.

Step#4: Make your connections

Now, mount your powered sub and make your connections. Try to use gentle curves with your wires and cables when possible to prevent unnecessary wear and tear.

Before you fire it up to test, turn the built-in amp's gains all the way down. And reconnect your vehicle's negative battery terminal. Verify that the sub turns on when you start the car. Then you can play some music and set your gains.

If you have any questions about powered subs, please give Crutchfield a call.

  • Virgil Woods

    Posted on 8/9/2015 7:00:11 PM

    Thank you for your time and expertise. I have a PPI 900.4 amp. running 2-Infinity PR6502is and 2-Infinity PR9603is. I just purchased the Rockville RW10CW 10" slim subwoofer. My question is, can I running my powered sub from my amp or do I need to running its own power to he battery? I know it should not be a problem, but I am looking for your professional opinion. Thanks again

  • Alexander Hrabe from Crutchfield

    Posted on 8/10/2015 9:19:48 AM

    Virgil, a powered sub by design has its own amplifier built into the box. You don't need to connect it to your other amplifier. You simply need to run power from the battery. Enjoy!

  • Les Price from Murray

    Posted on 8/22/2015 11:53:38 PM

    Why is it showing connecting to the battery with out a fuse inline?

  • Robert Ferency-Viars from Crutchfield

    Posted on 8/24/2015 10:54:18 AM

    Les, there's definitely a fuse holder on that power line. It came pre-installed on the power cable. It's just a little further down the line and out of the camera shot. The kit I used was an older version of this 10-gauge kit from EFX.

  • David

    Posted on 3/21/2016 10:38:27 AM

    I've got a 1999 BMW E36 328ic Convertible & am thinking of adding a powered subwoofer in the trunk. If I know the "pin-outs" on the connector going into the Stock Amp coming from the stock head unit, can I "splice" into those wires for the "Turn-On Signal" & Sub-Signal Inputs Left/Right?

  • Alexander Hrabe from Crutchfield

    Posted on 3/21/2016 2:32:51 PM

    David, that should work, but be sure to check your powered sub's manual to make sure that you actually do need to tap into the turn-on signal. Many powered subs will power on when they simply receive an audio signal. Also, keep in mind 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.

  • Scott Bausum from Circleville

    Posted on 5/24/2016 3:53:11 PM

    Can I/how can I run two powered subwoofers? I already have an 8" Dual Bandpass and am considering adding another if it is possible and will work well. Head Unit is a Kenwood Kmmbt312U. Thank you.