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Tweeters???? Hi, I have a pair of KLH 1230-SB's and the tweeters don't seem to be working on either of them.....the midrange and subs seem to be working fine.....the reciever i am using to power them is an AIWA AV-X270....They don't sound as good as i expected them to....usually i can figure out what's wrong with this type of stuff, but i can't figure this one out.....PLEASE help me!!!

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Hi oddone

You may have a problem with either blown tweeters, or a faulty cross over, or both. If you have a multimeter, you can remove the tweeter, and check it DC resistance. They normally have their impedance marked on the back of the magnet. If not, you can assume they should measure 8 ohms. If they measure open circuit (high resistance), then they have failed.
A good speaker repair guy can often fix an open circuit tweeter as they often break where the very fine wires attach from the voice coil to the terminal. you can take a turn of the voice coil and reterminate to solve this problem. If the voice coils are burnt, they will need to be replaced.
If the tweeter meters ok, then you may have a problem with the crossover capacitors going dry. Generally they are 2.2uf to 6.8uf in value, the smallest cap in the crossover. If the plastic coating on them is split, or they look a different colour to the rest of the caps, replace them, if they sound "hollow" replace em, if you are not sure, replace em. other than that there is not alot more to look for with a speaker box tweeter Good luck and happy listening.

If you have any dramas, get back to me here and we can talk more about it.

regards
Graeme

Posted on Mar 16, 2008

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