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Posted on Apr 26, 2009
Answered by a Fixya Expert

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Klh powered subwoofer keeps blowing fuses?

My subwoofer blew a fuse after a spike. It has not worked since. It blows a fuse as soon as you turn it on.

  • fhensal Apr 26, 2009

    Yes. I also took it to a friend who has worked fixing tvs, vcrs,etc. for 20 plus years, and he can not find a short in it. He says it keeps blowinf the fuse.

    Thanks, Gene

  • Anonymous May 11, 2010

    Hi



    did you replace the fuse with the same rating of amps?



    in other words, the one you replaced... is it the same amperage as the one you replaced?

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  • Expert 87 Answers
  • Posted on Apr 26, 2009
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Then the circuits took a hit and the fuse didn't do it's job in the 1st place. best is too get new circuit thats inside the sub woofer.

sorry to be the bearer of bad news

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Klh subwoofer keeps blowing it's fuse.

Most likely the amp in the sub has blown. It will need repair or replacement. I'd take it to an expert in repairing amps, it's not a job for you unless you're experienced in troubleshooting these things.
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KLH ASW8 Powered subwoofer keeps blowing 3A-250V fuses

The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.
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I sent an earlier question regarding a 10 inch KLH sub in that it keeps blowing a fuse. I turn it on, it humms and then the fuse blows. Is there anything I can do to diagnose this problem and fix it?

Fuses only blow like that when a semiconductor device is acting like a piece of wire causing an overload. An ohmmeter on the ohms setting will show any transistor with this condition as a short, just like you had touched the test leads together! Follow where the fuse leads to. And look out for signs of damage too. The most obvious parts to go are the ones that do the work, in the power supply or the main amp device, often an IC.
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I've got the KLH 10 inch sub and it keeps blowing fuses. Essentially, as soon as I turn it one, it will humm and then blow th fuse. Is this fixable at a reasonable price?

This can be due to either the integrated power supply system or the amplifier itself. As a tecnician I can imagine the possible faulty components and I guess that the cost isn't too big. But since I don't know your area I suggest to ask from a technician at your area to check the subwoofer.

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I saw this post. I have the same problem with my 10-100.
http://www.fixya.com/support/t2753393-klh_subwoofer_about_6_yrs_old_keeps
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IT KEEPS BLOWING THE FUSES

Bad news! They blew due to an overload, often caused by a shorted semi-conductor acting like it was a piece of wire.
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Subwoofer keeps blowing fuses.

THE AMPLIFIER "IC" MAY BE SHORTED!
IC MAY NEED REPLACED.
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Both 3 or 4 amp slow blow fuses are suitable replacements for the 3.125 amp subwoofer fuse.

It could be that the subwoofer is blowing the fuse because the one you installed was not slow blow.

But, more likely is the subwoofer has a short in the power supply which is causing the fuse to blow.
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Fuse on subwoofer keeps blowing

Subwoofers draw a tremendous amount of power. With the amount of heat generated by amperage flow and the movement of the voice coil, you may have burned out the coil. Do a resistance check across the coil. Easy check? Temporarily attach another speaker to replace that one. Use LOW VOLUME and slowly work the vol up,and, if the fuse does not blow, it's the other speaker.
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Fuse blows when powered on . KLH E-10DAW

Hi, you can get the fuse at Polk Audio. 800-377-7655. You can talk to technical, too.
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