Question about Speakers & Subwoofers

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V-1B M&K Subwoofer has a load humm

As you can imagine, I've had these speakers for over 30 years. The woofer is now making a humm and the only thing I can do is unplug it (the satellites are working fine). I don't know where to go to get it repaired, or if I can do it myself...I'm not a wirehead.
Thanks,
Mike

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  • Anonymous Dec 02, 2008

    I have the same subwoofer that was given to me by my father a few years back. it has all original insides to it. I do experience the SAME EXACT problem you have! My dad told me about it and I didn't notice anything until I really started using the subwoofer for extended periods of time (aka 2hours or more) yes, thats extended for me. lol

    Well, I haven't found anyone in Portland Oregon willing to 100% guarantee me they could fix the issue. As it is an occasional problem with my subwoofer.

    Have you had anyluck since your last post on your MK v-1b?
    also, I guess there were a few color choices. mine is the cherry wood. I have the matching Satellites with stands. All original insides in the satellites too. (father gave me them with subwoofer) I have no complaints with such an old speaker setup. As im a casual audiophile.


  • skidmoremd Dec 08, 2008


    You have been the only one to respond. I called a shop that said it would cost $180 to diagnose and then there is the cost to repair (unknown). I’ll get it fixed at some point, but for now, I’m going to hold off.

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Capacitors wear out over time, like a battery does. It's possible that the caps in the crossover are expired.

Easy fix if you're handy!

Else, try different interconnects. When an 'RCA' type interconnect fails, it often introduces noise audible as a hum.

Posted on Dec 02, 2008

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1 Answer

My subwoofer keep showing a red light when i switch it on, could it be a fuse fault?


Probably not. The red light indicate idle mode. The woofer might have an auto-sense switch. When activated the subwoofer turns on when an audio signal is sensed at the subwoofer input.
Such switches often have three positions:
Idle (Somewhat off, but not quite)
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Hello, welcome to Fixya!

Fault is either from the main system or the sub-woofer itself.

You need to test both unit in order to detect which of the two is giving the fault, so that you can concentrate on the faulty unit.

Test the woofer with a AA battery or any other battery. Put your ears close to the woofer and observe if you will hear any sound. If the woofer makes sound, then it means the woofer is working, but if it doesn't make sound, then it means the woofer is defective. Or you can disconnect one of the working speakers and connect the woofer to that part. If there is no sound, then obviously, the woofer is defective.

If the woofer seem to be working, then the unit needs to be tested also.

Connect one of the working speakers to the sub-woofer's section of the main unit. If the speaker doesn't bring out sound, check the system's menu settings, check the volume and make sure the sub-woofer volume is raised to the highest level and not on mute. ( Note that most Theater systems has separate volumes for each speakers). If the volume is raised to the highest level and there is still not sound from the woofer part, then it means the woofer channel has burnt. It could be a fuse or a defective channel. At this point, I think you need help from a repairman.

I hope the above is clear.

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1 Answer

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.

In case of a problem or clarification or further details needed, don't hesitate to post me a reply before rejecting my answer.
If you are satisfied, rate my solution with the "thumbs" or (even better) add a testimonial.

Thanks and regards
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