It didn't take me very long to figure out I really didn't want to be a auto stereo installer... and this was back in the mid 70's when it was still relatively straight forward... ie 4 wires to the amp ( typically with an eq in the middle between the head and amp) and a pair of wires to each speaker plus the power lines.
In fact, I'm pretty sure setting up for a gig with a 16ch snake to a 16ch mixer, a parametric eq, digital delay and reverb... then the lines to 6 speakers from 3 stereo amps, 4 monitors 1-2 guitars, bass, mikes for a drum set and a mike for each singer... was less work.