How to Tap into Rear Speakers for Subs: Enhance Bass Now!


Upgrading your car audio system with a subwoofer can enhance the overall listening experience in your vehicle. This article outlines the process of tapping into your car’s rear speakers to connect a subwoofer.


Understanding the Basics of Car Audio Systems

Understanding the Basics of Car Audio Systems

Before we dive into the installation process, it’s important to understand the basics of car audio systems and how subwoofers improve sound quality. Subwoofers are dedicated to reproducing low-frequency sounds, providing the bass that smaller speakers typically cannot deliver.

Tools and Materials Needed

Here is a list of the tools and materials you will require:

  • Wire stripper/cutter
  • Electrical tape or heat shrink tubing
  • Line output converter (LOC)
  • RCA cables
  • Speaker wire
  • Subwoofer and enclosure
  • Amplifier (optional if subwoofer is passive)
  • Philips and flat-head screwdrivers
  • Socket wrench set

Steps to Tap into Rear Speakers for Subs

The following steps will guide you through the process of connecting your subwoofer to your car’s rear speakers:

  1. Locate and access the rear speakers: Begin by identifying the location of your rear speakers. You may need to remove panels or covers to access them. Be careful to avoid damaging any clips or fasteners during removal.
  2. Disconnect the battery: For safety reasons, disconnect the negative terminal of your car’s battery to prevent any electrical shorts or accidents.
  3. Identify the speaker wires: Once you have access to the rear speakers, identify the positive and negative wires attached to each speaker. Consult your car’s manual if necessary.
  4. Install the Line Output Converter (LOC): Connect the LOC to the rear speaker wires. This device will convert speaker-level outputs into RCA outputs that can be connected to your subwoofer or amplifier.
  5. Connect the subwoofer: Run RCA cables from the LOC to your subwoofer or amplifier. If you’re using an amplifier, make sure to connect the positive and negative terminals from the amp to the corresponding terminals of the subwoofer.
  6. Grounding and power supply: Ensure that your subwoofer or amplifier is properly grounded to the car’s chassis. Also, run a power wire from the positive terminal of your car’s battery to the amplifier, with an in-line fuse installed within 18 inches of the battery to protect the system.
  7. Reconnect the battery and test: Once all connections are secure, reconnect the negative terminal of your car’s battery and test the system. Adjust volume and crossover settings as needed.

Additional Tips and Considerations

While installing a subwoofer by tapping into rear speakers is straightforward, here are some additional tips to ensure success:

  • Avoid cutting wires too short; leave extra length for adjustments.
  • Use high-quality cables and connectors to minimize signal loss or interference.
  • Secure all components in the vehicle to prevent damage from vibrations or movement.
  • Ensure the amplifier’s gain and crossover settings are properly tuned for the best sound output.
  • Consult a professional if you are uncomfortable with any steps in the installation process.
Pros and Cons of Tapping into Rear Speakers
Pros Cons
Cost-effective Potentially lower sound quality compared to a direct connection
No need for a new head unit with RCA outputs Increased complexity in electrical wiring
Retains OEM look of the car interior May void warranty if not installed correctly

Frequently Asked Questions On How To Tap Into Rear Speakers For Subs: Enhance Bass Now!

Can You Splice Into Rear Speakers For Subs?

Absolutely! Tapping into the rear speaker lines is a common method for connecting a subwoofer without requiring a dedicated preamp output.

Does Tapping Into Speakers Affect Sound Quality?

Minimal quality loss occurs if tapped correctly. Ensuring proper impedance matching and using high-quality connectors helps maintain sound integrity.

What Tools Are Needed For Tapping Speaker Wires?

You will need wire strippers, connectors or soldering equipment, electrical tape, and possibly a line output converter if your amp lacks speaker-level inputs.

Is An Amp Required For Adding Subs To Speakers?

Yes, subwoofers require an amplifier to deliver the necessary power and control for proper bass reproduction.


Adding a subwoofer to your car audio system by tapping into the rear speakers can transform your listening experience. Following the steps and tips outlined above, you can successfully install your own subwoofer and enjoy deep, rich bass on the go. Remember, safety is paramount, so take the necessary precautions during installation or consult a professional if in doubt.


Leave a Comment