What does this reverb unit do? Is this part of a premium sound package? My car just has one crappy speaker in the seat.
As said, it tried to mimic stereo using the crappy sound from an AM radio.There is a current discussion on the 300 Club, Intl list server about radios, etc. One of the guys described the reverb feature this way:
"the Reverb function was an early attempt to add stereo without having the needed Radio signals.
What it actually did was to take what was playing on the dash radio and delay the signal and then play it on the rear speaker. So, it's an electronic trick, to fool your ears."
If you really want to learn more, here's some reading. Page 4 gets into how it works. Car reverbs, 1964-1974