In Reply to: PLEASE HELP WITH SPEAKER WIRING posted by Jack Pitts on October 16, 2001 at 19:13:10:
About a year ago, I put 4 Polk DB speakers in my 1991 535i. But to do this, I also had to put a new 4 channel amp in to run all of the new speakers. I completely removed the factory amp and all of the factory speakers. I was able to use the plug to the factory amp to get power, ground, plus the frt. left, frt. right, rear left and rear right speaker signals for the new amp. I also used the factory speaker wires to run the signal from the new amp to the new speakers.
If you really want to use the setup you have, you will have to install crossovers between your new amp and the factory drivers. The problem is trying to determine what the crossover point is for these speakers. I thought I had some old info stating the estimated crossover points, but I couldn't find it. If you're pretty knowledgeable with car stereo systems, you could buy a continuously variable crossover and fiddle around with it. If you're not, I'd suggest a trip to a good car stereo installation center.
Robert J. Kieffer