Connecting a woofer to your car's audio system primarily involves three methods: using a line output converter (LOC) with a factory stereo, connecting directly to an aftermarket head unit with preamp outputs, or opting for a powered subwoofer that simplifies the process. The safest and most common approach for a stock stereo is the LOC, which taps into your rear speaker wires to create a low-level signal for an external amplifier. This amplifier then powers the woofer. For a clean installation, you'll need a wiring kit, basic tools, and about 1-2 hours.
The first step is always disconnecting the car's battery to prevent electrical shorts. Next, you'll run a power cable from the battery's positive terminal through the firewall to the trunk, ensuring it's fused within 18 inches of the battery. The location of your amplifier dictates the rest of the wiring. You'll need to run RCA cables (from the LOC or head unit) and a remote turn-on wire alongside the power cable, keeping them separated to avoid engine noise.
For the signal, locate the wires for the rear speakers. A line output converter is crucial here. It connects to these speaker wires, converting the high-level signal into a low-level RCA signal that your amplifier can use without distortion. After connecting the LOC to the amp, and the amp to the woofer, you reconnect the battery to test the system before securing all components.
| Component | Purpose | Key Consideration |
|---|
| Line Output Converter (LOC) | Converts speaker wire signal to RCA signal | Essential for factory stereos without RCA outputs |
| Amplifier Wiring Kit | Provides power, ground, and signal cables | Kit gauge (e.g., 8-gauge) must match amplifier's power requirements |
| Amplifier | Powers the subwoofer | Ensure its RMS power rating matches the woofer's for optimal performance |
| In-Line Fuse | Protects the electrical system from shorts | Must be installed near the battery connection |
| Remote Turn-On Wire | Tells the amplifier when to turn on | Typically connected to a "remote" or "amp turn-on" wire in the stereo harness |
Tuning is the final step. Set the amplifier's gain control low initially, then adjust the bass boost and low-pass filter to blend the woofer smoothly with your main speakers, avoiding overpowering bass.
