Woofers getting workout, but no bass

YEah, its rumble originating from the warp inherent in many records that is typically at highest magnitude at the beginning of the side/outer edge perhaps magnified by sonic feedback from vibrations.

A concrete floor is good. IS the table sitting on a solid foundation/stand upon the floor? If not, it should be. If it is sitting up high on a stand, try a lower platform perhaps?

If the table is sitting rock solid and you still have problems, a switchable subsonic fileter may be the only remedy, but if all else is well, then in most cases practically this is not needed.

If your woofers are moving with large excursions for reasons other than the signal from the record, then this is utilizing power to produce noise and the power is not then available for the actual signal/music.

BTW, some of this (woofer excursion due to rumble) is naturally inherent in record playback. If you have everything else set up well together and the records are not abnormally warped, then I would not worry about it.

Not familiar with your table, but another thing that can help is to have a tt platter that is large enough in diameter to support the record all the way to the outer rim properly. TAbles with smaller platters are generally more susceptible to this particular curse.

Also, if you have a dustcover, keep it down while playing. THat should help minimize the unwanted effect.

YEs, changing cartridges may have an effect but I am not certain how to determine what to switch to to assure desired results. Higher compliance maybe? Something that produces a different resonant frequency with the specific tonearm utilized perhaps?

PErsonally, I am not a fan of filters of any type. With proper setup and match of equipment, the problem is usually not an audible issue to start with. GEtting to that is the trick of course though. Record players can be tricky beasts and not easy to get right!

Here's more background info on cartridge compliance, resonance frequency, and potential impact for rumble, etc.

http://www.gcaudio.com/resources/howtos/tonearmcartridge.html

Hope this helps.

"Is that not a subsonic filter?"

Technically, perhaps not, but essentially the same effect most likely from a practical perspective, and perhaps not switchable in/out. Probably a good thing still.

Yes, ported speakers are more commonly susceptible to this kind of thing from what I have observed over the years, but I think the problem can affect other designs using dynamic drivers as well.

I think since porting is a very common approach to extend low end response on speakers that the problem is more common there, but not a result of the porting itself.

Not sure about IMD distortion, but it still might result in faster amp clipping even with a planar or electrostatic speaker with similar frequency response I would think.

"Are you saying a ceedee playing down to,say, 25Hz will also cause excessive excursion?"

No, its a vinyl playback artifact not present in CDs.

"I think that ported speakers may be more susceptible, but that doesn't tell the hole story, IMO."

I would agree.