In Reply to: Calling Car Audio Gurus posted by tonka530i on August 01, 2001 at 13:11:40:
Here's what I did. I bought a factory CD changer to install in the trunk and kept the factory Alpine head unit. The main problem with E34 is in the amp system. The amp actually performs the crossover and amplification functions and then sends the individual high/mid/low signals to the corresponding speakers. To get the best sound, you probably need to get rid of the stock amplifier, as I did. The factory head unit supplies a low level signal to the amp. I found the correct wires and spliced them into RCA plugs, which I could then plug into an aftermarket 4 channel Sony amp with equalizer. Although it would be better to run larger gauge speaker wires to each speaker, I used the factory wires. I used Polk DB component speakers up front and Polk DB coaxials under the rear deck. I also installed a second amp and 10" JBL subwoofer which fires through the ski passthrough behind the rear seat center armrest.
The main trick to this whole thing is the wiring. One blesses soul from the E34 message board faxed me the wiring diagram. After that, it was a matter of connecting the right wire to the right thing. In the end, the sound was much improved. I have a slight alternator whine that I'm trying to eliminate now, but overall, the sound is much better than the stock system. If you have other questions, e-mail me direct.
Robert J. Kieffer