Question about KLH HT-9930 System

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KLH tweeters stopped working

I have a pair of HLH 2 way speakers model AV 3000.  Both the tweeters stopped working at the same time but they are not blown. I removed them and put them in a pair of working speakers and they did not work their either.  The working pair was a different brand does that matter?  Is there a way to fix them or do I need to replace them?  Why would both tweeters go out at the same time?

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  • Durwood187 Jan 12, 2008

    I did disconnect the tweeters and checked them directly with the speaker wire and got no sound is that what you meant?  I can probably borrow a ohm meter from the physics department here so when I do were is the tweeter coil located and how do I check it?

  • Durwood187 Jan 13, 2008

    k I checked it and got no resistance from the tweeter.  

  • Durwood187 Jan 14, 2008

    k that is what I figured.  Thank You

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Hi, have u first disconnected the tweeters and then checked, as if its on a cross over, the tweeter is in series with a capacitor,if u have a ohms meter or a continuety tester check the tweeter coil if its open,secondly you can have the coil replaced, check if u can get one before buying a new,let me know

Posted on Jan 12, 2008

  • ravi chavan Jan 13, 2008

    hi, just put the probes of the meter on the two terminals of the tweeter and see if u can get a continutey, or some resistance, if it dows not than the coil is open.. . the coil as u know is in the center of the spider or the cone.u.... cannot see it.let me know

  • ravi chavan Jan 14, 2008

    hi, bad luck buddy, they r out. see if u can get it re-coned from a speaker repair shop, some tweeters can be recoiled, depends what type of coil u have??or new ones buddy..

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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

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