Quote:
Originally Posted by Laird Scooby
Most likely the amp. Assuming you've had the speakers working of course. They can and do fail though, they're now 30 years old and the cones are (or were!) paper and usually disintegrate. This means the voice coil of the speakers moves without creating a sound.
If you have an output to the dash mounted tweeters, theory says if you run a bit of speaker wire from each of those to the door speakers, you'll hear something.
Usually tweeters are supplementary to the door speakers and have a passive crossover (usually just a capacitor in series with the tweeter) but it could be Volvo have done things differently. It might even be they're not even tweeters as most people understand them but simply fill-in speakers. Usually the door speakers are full range units in the doors.
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Volvo head units of that era and their associated wiring are a world away from modern logic/common sense and accepted principles!!