Connect Car Subwoofer Speaker Level Output

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Connect Car Subwoofer Speaker Level Output

Connecting a subwoofer to your car’s audio system can greatly enhance the bass reproduction and overall sound quality. Many modern car audio systems come with a dedicated subwoofer output, but some older or aftermarket systems may not. In such cases, you can use the speaker level output from your car stereo to connect the subwoofer. This article will guide you through the steps of connecting a car subwoofer using speaker level output.

Step 1: Gather the necessary tools and equipment

Before you can start the installation process, make sure you have the following tools and equipment:

  • RCA cables
  • Speaker wire
  • Wire strippers
  • Wire crimpers
  • Subwoofer
  • Amplifier (if not already installed)
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Step 2: Locate the speaker outputs

The first step is to locate the speaker outputs on your car stereo. Most car stereo systems have speaker outputs labeled as “speaker out” or “rear out”. In some cases, you may need to refer to the car’s user manual to find the exact location of the speaker outputs.

Step 3: Identify the positive and negative wires

Once you have located the speaker outputs, you need to identify the positive and negative wires. The positive wire is usually red or marked with a “+” symbol, while the negative wire is usually black or marked with a “-” symbol. Use a multimeter or consult the car’s user manual to ensure correct identification of the wires.

Step 4: Cut the speaker wires

In order to connect the subwoofer using speaker level output, you need to cut the speaker wires from the car stereo. Trim the wires close to the stereo unit, leaving enough length to work with. Make sure to leave some extra length for flexibility during the installation process.

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Step 5: Strip the wire insulation

Using wire strippers, remove about half an inch of insulation from the ends of the speaker wires. This will expose the copper conductor of the wires, allowing for a proper electrical connection.

Step 6: Connect the RCA cables to the speaker wires

Take the RCA cables and cut them in half. Strip the insulation at one end of each RCA cable to expose the inner wires. Connect the positive speaker wire to the center pin of one RCA cable and the negative speaker wire to the outer ring of the same RCA cable. Repeat this process for the other speaker wire, using a separate RCA cable.

Step 7: Connect the RCA cables to the subwoofer

Connect the RCA cables from the speaker wires to the input terminals of the subwoofer. The positive RCA cable should go into the positive input terminal, and the negative RCA cable should go into the negative input terminal. Ensure a secure connection by tightening the terminals using a screwdriver or your fingers.

Step 8: Connect the subwoofer to the amplifier

If you already have an amplifier installed in your car audio system, connect the subwoofer’s output terminals to the corresponding input terminals on the amplifier. Use a separate RCA cable for each channel of the amplifier, ensuring that the positive and negative terminals are correctly matched.

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Step 9: Power on the system

Before testing the system, make sure all connections are secure and tight. Then, power on the car’s audio system and play some music with a good amount of bass. Adjust the subwoofer level and crossover settings on the amplifier, if necessary, to achieve the desired sound quality.

Step 10: Fine-tune the system

Once the system is powered on and playing music, assess the sound quality and adjust the settings as needed. Experiment with different subwoofer level, crossover frequency, and phase settings to find the optimal sound balance for your car audio system.


Connecting a car subwoofer using speaker level output can be a relatively simple and cost-effective solution. By following the steps outlined in this article, you can enjoy enhanced bass reproduction and improved overall sound quality in your car audio system. Remember to take your time during the installation process and double-check all connections to ensure a proper and secure installation.



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