How To Install A Subwoofer To A Factory Stereo

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How To Install A Subwoofer To A Factory Stereo

Are you tired of listening to low-quality music on a car factory stereo? Want to add flair to it but didn’t find any means to do it?

Installing a subwoofer in a factory stereo is the best way to revolutionize your music listening experience to the premium level.

But the next question that may concern you will be, How can I install a subwoofer to a factory stereo without having any technical DIY knowledge?

Well, installing a powered subwoofer to a factory stereo is a straightforward process.

First, you’ve to disconnect the battery and attach the power cable at both ends, i.e., battery and subwoofer.

After that, connect other cables to the stereo, set up a ground wire, and make wiring connections to binge listen to subwoofer high bass sound.

Now you’ll get a rough idea of how to install a subwoofer to a factory stereo.

But that’s not enough; since it is a complicated task, you must be aware of each detail before moving toward the installation process.

And for that, we’ve given a step-by-step guide below, which will provide you with profound knowledge and help make your task a kid’s stuff.

Without further ado, let’s get straight into it. 

7 Easy Steps To Install A Subwoofer To a Factory Stereo:

Required Tools:

No matter how complex your DIY project is, tools can help make it a child’s play.

Below are the required tools you should get before following the process.

  • A toolbox
  • Subwoofer box
  • RCA cables
  • 50 amps inline fuse
  • Speaker wires
  • Amplifier
  • Wiring kit
  • Screws

1. Disconnect The Battery:

Nothing is more important than your safety and life.

First, you must disconmuste the car’s battery to ensure you find the battery under the vehicle’s hood.

All you need is to remove the black-colored wire from the battery’s negative terminal.

Once you’ve successfully separated the black cable, you’re secure. You can res complete the t of the subwoofer installation process.

3. Inspect the Car Stereo Wires:

Here comes the next step, where you have to pay attention to factory stereo cables and ports.

You will need to attach your subwoofer cables to the car factory stereo.

First, look for a red-colored power wire, which must be attached to the car battery.

This wire will provide the subwoofer with a constant flow of energy to work smoothly.

You can run the power cable from the firewall to where the subwoofer is located.

To protect the wire from any future damage, you can slip it under the car carpet, and the trim panels–only fall along one side of the rug.

The next step is to attach the fuse to the cable before connecting it with the battery’s positive terminal.

In most cases, you will get the fuse already installed with the kit, but it doesn’t.

You have to cut the cable at some point where the other end should be easily reachable to the battery. 

Now, strip the isolation of both ends, attach the fuse there and connect it to the terminal.

Mounting the fuse relatively close to the battery is considered good practice since it prevents short circuits and other hazardous occurrences.

Read More: How to Charge Car Battery Using Home Electricity

4. Check the RCA Cables and Turn-on wire:

After running the power cable to the subwoofer, you have to make the way of turn-on wire and signal cables towards the stereo.

It’s the opposite of the process you’ve done previously.

You must ensure that the turn-on wire and RCA cables don’t contact the power wire while running them to the stereo.

Otherwise, they will distort the sound entering the system and ruin your music listening experience.

Once you’ve done this, it’s time to attach the wires to their mean places.

You have to connect the RCA cables to their respective RCA outputs on the stereo and the Turn-on wire (blue line) to the stereo’s wire harness.

This step is only possible if you have an aftermarket stereo with preamp outputs.

If you have a factory stereo, the Line Output Converter (LOC) can help get the signals from the stereo to the subwoofer.

The LOC deals with high amplified signals to RCA preamp level signals.

5. Connect the ground wire:

The third primary connection is the ground wire.

You need to connect this wire to the vehicle chassis or any nearby part using the bolt, which you can fasten.

The ground wire must contact the naked metallic part of your vehicle.

If you find some paint and other stuff on the metallic plate, remove it using sandpaper to ensure the wire is grounded correctly.

Once you’ve done this, it’s time to set up the wiring connections in the subwoofer.

6. Setup the wiring connections:

Here comes the step of running the test of the newly connected powered subwoofer with the car factory stereo.

Recheck the connection of wires to ensure everything is connected correctly in its desired place.

Connect the battery’s negative terminal, i.e., reconnect the powered wire.

If everything runs smoothly, you’re all set to listen to your favorite music in clear high-bass sound.

7. Get into the groove:

Get into the groove with the new sound quality of your vehicle.

Turn on your favorite music, jump on your friends in the car, and enjoy the long drives.

Safety Measures You Should Follow Before Getting Straight Into Process :

If you’re an amateur installing the subwoofer to the car factory stereo system.

You should follow safety measures to avoid any damage or accidents.

We’ve mentioned some safety measures below; let’s look at them.

Disconnect the battery first:

While installing the subwoofer, ensure the negative wire is disconnected from the battery.

If you leave, it is turned on; this may result in causing severe damage to you.

Avoid contact with moisture:

If you’ve any liquid material around you while setting up the wires, please move it to another place away from your car.

This will help prevent short-circuiting in your vehicle.

Use safety gloves if possible:

Since you will be playing around with the wires while setting up a subwoofer, wearing gloves is a good practice to save yourself from any uncertain damage.

Keep all the volume down when doing a test run:

When doing a test run, ensure all the volume buttons are at their minimum level.

It helps prevent your subwoofer from any uncertain damage when it gets instant power.

Make use of a capacitor:

A capacitor will help prevent a voltage drop when the deep bases hit the amp.

Keep the capacitor as close as possible to the amp and use the same ground as the one used for the amp.


Installing a subwoofer to the car factory stereo may seem to be a bit daunting task, but when you get your hands dirty with the process, it is nothing more than low-hanging fruit.

Make sure to follow precautionary steps to ensure your safety is in the first place.

Once successfully installing your subwoofer, keep it in good condition by cleaning it with lint-free material.

In as easy a way as possible, we described how to install a subwoofer to a car factory stereo.

If you have difficulty following the process, don’t be ashamed to shoot a message, we’ll love to help you.

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