Amplifier wiring diagrams: How to add an amplifier to your Oct 27, 2017How to wire a full car audio system . This wiring diagram shows how a full-blown car audio system upgrade gets wired in a car. The system depicted includes new speakers, an aftermarket receiver, a 4-channel amp for the front and rear pairs of full-range speakers, and a mono amp for a subwoofer. The extra gear you'll need for wiring the ampsReviews: 257Author: Buck Pomerantz Speaker / Amplifier Wiring Guide - DIY Audio & Video Also, the insulation isn't of the same quality as speaker wire. These points are especially important when dealing with car audio. Still, it can be done. It would be best to solder terminals to the ends of the wire to prevent the rust problem. What size power wire should be used when wiring amps for a car?