You realize this is a 5 year old thread?

That being said I'll be doing similar things as the new to me 92 400E has an aftermarket stereo that needs help. Seems like they have the rear speakers hooked up as well as the doors but not the fronts - coupled with a giant stupid Omega aftermarket sub taking up half the trunk.

I figure I'll go with fronts and rears, and the door speakers as the subs (as I believe the factory system intended). I realize people do lots more but the factory locations sounded OK for what I am looking for.

I have not started search on any preferred methods of wiring (but it looks like lots of info is out there) - fronts and rears to head unit door subs a second amp, front and rears from the head unit but wired into the factory fader... etc.

Paul