Oh man, that probably sounded soooo good while it lasted! I wonder why it didn't last, though.
I can see it working like CDTs upstage/centerstage kit. The sound from that center speaker probably reflects off the dash/windshield and then reaches both driver and passenger at the same time, then creating a nice image of a stage up front! Genius! Using reflections to your benefit.
It probably adds a good bit of ambiance, too, giving the presence of sound around you, beside you, under your armpit. If it has enough excurshun, I can see it helping cool the armpit.
Was the speaker hooked up to left or the right channel? summed mono? Or was it a dedicated center channel using dolby digital playback, or bi-phantom or something?