I am looking into doing this install. Haven't decided on the front speakers, but the underseats will be earthquakes.
My question is, if in the future I will want to change the rear spekers as well, and posibly add another speaker in the dash, couldn't I just use the output from the current wires in the back, connect them to an amp, and then connect the new spekers to that amp? In this scenario I will use only the stereo 2/4 harness and still have amplified back speakers.
Am I missing something?