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.

tomcarr07-17-2023 8:45pm

tomcarr OP Details Discussions Posts This discussion Message User 1,818 posts 11-10-2025 at 05:58pm Copy Comment URL Report Comment Edit Delete Hello @atmasphere ! I don't think it's the pre or the source because I've had two different preamps, and two different sources, and it has happened with both configurations. It only happens when listening to two songs, out of the thousands of songs I listen to. I'm of the opinion that there is some subsonic bass buried in those specific recordings. Thanks to all for your opinions!
atmasphere Details Discussions Posts This discussion Message User 12,422 posts 11-10-2025 at 06:22pm Copy Comment URL Report Comment Edit Delete @tomcarr The way you were talking about this in your initial post, I got the impression you had a problem with motorboating, which is where the woofers pump on an on-going basis. But if it only happens on certain tracks then the system is just doing its job so no worries.
tomcarr OP Details Discussions Posts This discussion Message User 1,818 posts 11-10-2025 at 06:33pm Copy Comment URL Report Comment Edit Delete Thanks @atmasphere! Always appreciate your posts.