On your front doors, the wiring harness there controls the wiring for that entire side. There is a "left front in" "left front out" "left rear in" "left rear out". The "in" is coming from the headunit and the "out" is coming from the amp. First cut the factory speaker off close to the speaker so you have some wire to work with.. Use the supplied bare wire-to-RCA adapters to connect the REF amplifier's inputs to either the front or the rear speaker outputs of your car audio system's head unit (splice crimps not included). Important: Some factory-installed audio system amplifiers include electronic filters that limit the amount of bass sent to the system's smaller
1.) Pull the driver side interior door panel off and remove the Infinity 6x9 speaker. Clip the wiring harness that goes to the speaker, taking care to leave ~4" of wire past the connector. Connect the wires as described below. I always solder my connections and finish with heat shrink tubing. Tie the Yellow, Gray, and Black wires together. Refer to the wiring diagram for your Infinity radio to determine which wires need to be connected. Match the colors of the wires on the wiring harness adapter to the corresponding colors on the Infinity radio's wiring diagram.. When it comes to upgrading your car's audio system, the first step is to remove the old radio..