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! |
@erik_squires Good point! Looking closely, it is vibrating like it's normal twin, but it also is moving very slowly in and out, about a half inch. Yes it's making bass. It sounds just like its twin. Bear in mind this has only happened twice in a year.
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@atmasphere Good advice! I am supposed to be getting a new CD player tomorrow that I ordered a month ago. I will be going through all the suggestions. Thank you. |
Second the motion on switching speaker cables and seeing if the pumping motion moves over to the other speaker. If that happens, then the source is the problem. I have a few recordings that do have subsonics. One in particular is a CPE Bach recording in which the orchestra and audience were apparently on a wooden stage or platform along with the microphones and you can hear the subsonic rumble from people moving around. That's just one example. Another cause of this in the old days was from warped LP records, or turntables that were poorly isolated. The pumping motion of the woofers was very obvious. |
