Question about Boston Acoustics PV500 Subwoofer

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Came home after a storm and smelled electric burning and heard a hum from the subwoofer. now i wonder what the problem is and is it worth getting fixed.

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I had almost the same problem. I was Playing music and my speakers kept on shorting out, i smelled burning wires and i look in back of my subwoofers and there melted. i just simply replaced the wires exept with a thicker 14 Gauge wire. But i dont know if your subwoofer is damaged or not. but i would try changing the wires.

Posted on Oct 05, 2009

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Subwoofer is hummig what is this noise


Hum is a constant low-frequency buzz, usually at about 60 Hz or 120 Hz, which results from voltage differences between true "ground" (what you'd get shoving a copper pipe into the ground) and the electrical "ground" of your receiver's chassis When this voltage differential exists, it's called a "ground loop," and the hum it produces is darned annoying. You'll hear the hum mainly from the subwoofer because it's a low-frequency noise, you will need a ground loop insulator they are about $20 at any electronic store

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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.

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1 Answer

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I have heard of (not experienced) short circuits causing localised wiring damage, and too the extreme fires,

I hope this helps

Please vote if you liked this response

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