If it's solid state, this may happen with an intermittent regulator. You may lose a + or - rail, but the coupling cap will eventually compensate for it. Maybe. :D
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@erik_squires Thank you for the info. I'll contact Topping and see if I can get any info. What really surprised me was the tech at B&W didn't have any idea what could cause it to happen!!! |
Well, the speaker is just a motor. No reason B&W should know, if the upstream signal is causing it to move. The woofer is just a slave to the signal. Nothing to do with them. Can you explain a little more what you mean by pumping? Does it shiver quickly? Does it sloooowly move out and back? Does it seem to be trying to make bass, but nothing comes out? |
@tomcarr Swap the channels left for right between the amp and preamp. If the problem moves then the amps are off the hook. Since you tried 2 amps you probably don't have to do this test, but you do have a source which could be the problem. Swap the interconnects between it and the preamp. Play the offending tracks and see if the problem moved to the other channel. If it did => the source has the problem If it did not => the preamp is the problem Good luck! |
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