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Yeah, the 940 has up to an 8-speaker factory system. My dad's car is a wiring nightmare; it has speakers everywhere. That lends itself to some confusion when installing a new stereo. Some of the speaker wires come from the back of the head unit, and some go through the amp.
This is unnecessary, actually. The two dashboard speakers can be isolated with the front speakers, with a simple high pass, since they're tweeters. The dashboard speakers are powered by an amp.
FOr the 945, you should only have (up to) a 6-speaker system, unless they put speakers elsewhere behind the rear seat. My point is, the factory amps are never very powerful, and you'd be better off just isolating the speakers from the amp entirely. Essentially, you could take the amp out. But you're going to have to do a little bit of wiring that will allow you to get right to the speaker wires, which means you'll have to test for the speakers on the wiring harness coming from the amplifier. Use a AA battery to test for speakers if you're stuck. Like I said, isolate the tweeters, and wire the front and rear doors directly to the head unit. That will give you the most powerful and probably the best combination possible. So far, I haven't seen an aftermarket harness that allowed for total connection to the system. Some improvisation has been necessary.
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Chris Herbst
1992 745, 68k
And others:
93 944, 150k
90 245, 110k
88 744, 160k
87 245, 185k
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