Woofer motion problem.

Back in the day I had a big ol' honkin' reciever (marantz or Technics, can't remember which) that had a switch on it that said Subsonic Filter, if I didn't turn this ON the woofer would do what you are descibing when I played records.

Thanks guys for your responses. Do you think this could harm a speaker?

This happened to me on a few albums I transfered over to cdR. As someone else stated, you do need a plateamp with a rumble filter. As far as damage goes, I would think this excessive repetitive movement can't be a good thing. Call one of the subwoofer manufactures and ask them.

Macd...It is unlikely to harm the speaker, but it does have a bad effect on the sound. Get a rumble filter.

For what it's worth, it is as much a part of the speaker design as it is the warp wow from your records. A vented speaker is undamped below its resonant frequency, hence the uncontrolled motion. I agree with El, it is unlikely to harm the speaker, but being low freqency in nature, it still eats up a lot of amp power and the whole situation seem quite undesireable.

The rumble filter is one solution, but you don't list your phono stage on your system page. Some phono stages have built in high pass filters or switchable high pass filters.