Electronics > Repair

Repairing old stereo crossover

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Me and a friend was repairing an old stereo he have, and the speakers have a a passive crossover inside each box. All tweeters failed, so my first guess was that the crossover was faulty and took the tweeters with then.

So I kinda R.E. the circuit, but it doesn't seems to make much sense to me why they built it that way. It is not any typical filter configuration I have seem.

The stereo is very very old, the Caps are HUGE, I also never seem that kind of color-coded looking caps, I found googling that they are of polyester type.

The stereo is a Polyvox 5000 like this one

[![xover by victornpb ca5f5437754d4c88 - Upverter]

I have no clue about the inductor value, the tweeters are 2 16ohm in parallel.
2 of the caps of of the high-pass part are cracked on the sides.

The only failure of the cross over which could damage the tweeters would be if one of the 2 condensators C17 or C18 is shorten.
Are you sure your amplifier is not oscillating at high frequency?

I agree that HF oscillation was the likely cause of the tweeter failure.

Couldn't the amp being overdriven into distortion blow the tweeters?
With it being in a rack with a mixer on top indicates it had been used in a working environment and might have been pushed too hard.

Also a possibility of course.  Passive crossovers rarely go faulty apart from physically dislodged parts and cracked joints.


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