Ok, this is making more sense now... I've known OF the Multiplex systems, but not exatcly what the system was comprised of. And never heard it refered to as an amp only as a multiplex...

In effect, I believe we are basically talking about the same concept... as the reverb was used in earlier models to in a way Fake, stereo sound
and it appears that they changed to the Multiplex for true stereo definition for the 69 model.

It almost sounds like kind of a crossover/power booster type of thing?

Steves on line service manual only went to about 15/62 or so... almost covered that section! Doh!
http://1968firebird.org/

Thanks for looking up the additionl info... like I said, I love to learn all I can about out first gens!

Brett - 67 Drop Top 455!