Woofers pumping


On two occasions I have noticed the woofers of one speaker moving 1/2 inch excursions. Both times the SPL was peaks of 93 dB.

System is CD player, preamp, amps.

This has happened with two different amplifiers.

I spoke with the tech at B&W and he didn't have an answer.

tomcarr

I called B&W again today hoping to be able to talk to a different tech.

Apparently, there is only ONE tech, and he isn't any help at all!!!

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.

 

@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.