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Old 24th November 2013, 06:48 PM   #1
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Default subwoofer explodes vibrates shakes

I searched for another thread to match my problem and just couldn't find one. About 10-12 years ago I purchased a Yamaha RX-V793 Receiver and had an Atlantic Tech speaker system attached to it. About a year ago, when powered up, the subwoofer just vibrated as loud as possible (without the Rx on) and was so loud and shaking the room you couldn't be near it. As the Rx was off, I thought it was the sub and replaced it with a Polk Audio PSW 10 a year ago. All was fine until yesterday when it did the same thing with the Polk sub. Do I just need to toss the Rx? Confused as the power was not on the Rx when I hit the main powerstrip power. The sub does not "click" or "humm" this thing is like a ship horn and as loud as it can get... Thank you for you help. This is my first post, so the format may not be right... Mike
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Old 24th November 2013, 07:04 PM   #2
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What happens with the sub disconnected from the RX ?
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Old 24th November 2013, 07:07 PM   #3
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Quote:
Originally Posted by funvacation View Post
As the Rx was off, I thought it was the sub and replaced it with a Polk Audio PSW 10 a year ago. All was fine until yesterday when it did the same thing with the Polk sub. Do I just need to toss the Rx?
Mike,

The interconnect cord between the sub and receiver may be bad, intermittent short causing a full tilt boogie amplification of line noise.

Are the sub and receiver both running off the same AC circuit?
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Old 24th November 2013, 07:22 PM   #4
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Thank you both very much for your responses; greatly appreciated. I have not tried anything yet as I just wanted to turn the power off as it was incredibly loud. I will begin to isolate the sub by disconnecting the cord between the sub and receiver. Just odd that my cords are never moved and it didn't happen for a year after the install of the second sub. Will try a few things as I don't want to throw away a perfectly good sub (like I may have done with the first one... argh). I also worried about a fire as the first sub would go on and stay on by itself making the loud noise. Mike
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Old 28th November 2013, 08:15 AM   #5
ODougbo is offline ODougbo  United States
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Mike, better get a power strip on your sub.
It's unusual in the home, but get enough wires on the back of the system and weird things can happen, feed back, etc.
First thing to try to move power cables up out of the way, move them to one side with plastic wire organizers.

But I think the sub-amp is the problem. E.g. my buddies plate amp smoked up bad, gave him a real scare; only had it 13 months and it was a 8ohm connection.
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