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Some help... (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by R Kieffer on October 16, 2001 at 22:28:30:

In Reply to: PLEASE HELP WITH SPEAKER WIRING posted by Jack Pitts on October 16, 2001 at 19:13:10:

The main thing you have to realize in the E34's is that the crossovers for the speakers are inside the amp. That means that the only signal getting to each speaker is what it's meant to reproduce. Because of the way the system is designed, it's pretty much impossible to mix new stuff with factory stuff. If you were running wires straight from your new amp to the factory speakers, the signal was going through no crossover to separate the signal and send the highs, mids and lows to the proper drivers. You were probably sending the mids and tweeters low frequency signals they were not meant to handle. If you turned it up very loud, there's a good chance you may have blown the tweeters doing this.

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
1991 535i

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