Yo, Atom heart,

It looks we're on the hunt for the same info.

Have you figured out the front/rear, left/right amp thing yet?

From the Audio System Circuit Diagram (ACSD), it looks to me that power amp inputs 7 and 10 are left inputs and amp inputs 8 and 9 are right inputs: question is which are front and rear? Seems that pairs 7 and 8 would be one stereo pair (front?) and 9 and 10 would be the other pair (rear?)

I never had the original factory unit so a dumb question: did the factory head have a front/rear fader? I would guess NOT based on the ASCD.

Also, are the rear speakers bi-amped? Each rear spkr has four wires which seems to indicate two stereo pairs . . . hmmm.

I sent this message to you in a PM - give that a read please.