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KLH ASW10-120 Subwoofer - Page 3 Questions & Answers
I replaced the fuse in
Check out this thread
http://www.fixya.com/support/t2753393-klh_subwoofer_about_6_yrs_old_keeps
SPEAKER HUMS AND SMELLS OF BURNING.
I have the same problem, a few months ago I plugged it into the wall socket, turned it on, then it just hums. Never smelled any burning until I opened it up. There are Two Large Electrolytic Capacitors on the main amplifier board that have completely leaked. There are three resistors that got so hot that the center of the board is burnt black. Next to those three resistors are a bunch of smaller electrolytic capacitors that also have scorched marks surrounding them, although there appears to be no leaking.
The last time I used the subwoofer, it worked great as it has for years. I unplugged it for a week and then when I went to use it, it started humming. I am an electronic technician by trade, I don't think its worth the time and materials to replace all of the defective parts. I suspect that the isolation transformer failed that then caused the main board to poof. The fuse on the outside is on the AC side and is fine. Which indicates that the disturbance is on the other side of the transformer. I do not have a schematic but the main board fuse (if there is one) failed to prevent a full on frying. The control board looks undamaged. If I can find on ebay a junk one that is for sale, I would replace the transformer and main amplifier board. The speaker appears to be ok, but I measured the resistance and it registers 3.2 Ohms. Which is odd, considering speakers tend to be in the even numbered categories such as 2, 4, and 8.
Hope this helps, I gotta buy a new subwoofer.
Over heating
If it is overheating then it is being driven too hard. You need to either reduce the volume, decrease your crossover frequency or allow the amplifier more air; i.e.; if the amplifier is covered with something like a blanket then it needs to be removed.
I burned up some resistors
This is a pretty common problem with this sub.
Here's a solution that I posted earlier this year, including schematics for the upper and lower circuit boards. Be sure to check the circuit board revisions to make sure they match my schematics.
Fried electronics in KLH ASW10-120B subwoofer
It is a 4 ohm nominal impedance woofer. If you put a new woofer in, it will last maybe half an hour and then fry/melt. The problem is the amp, not the woofer. Throw the amp out and use the box as a passive sub. Get a 100 hz sub crossover.
KLH subwoofer Model BASSBite V. Has a bad 60Hz buzz
Before you go throwing money at this problem, try to eliminate any external influences like track lighting. I myself am trying to figure out why mine makes a buzz throughout my system when the lights are on. I already replaced the variable light control with no improvement.
Bad cable ground can let airborne electronic noise into the Sub's amp.
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