Woofers getting workout, but no bass

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.

Madfloyd,

I am considering buying a TTweights peripheral ring, so I would greatly appreciate your feedback on whether it reduced/eliminates the woofer pumping and also you perception on its effect on sound quality.

Although the woofer pumping generates frequencies that are (mostly) too low to hear directly (unless the woofers are bottoming out), it does load your room with low frequency pressure that will affect the sound (ala REL sub, but in an uncontrolled way).

I have some records that are worse than others when rumble is observed via cone excursion. Same cartridge. Concrete floor...shelves made with carbon fiber/epoxy 1/2 inch thick. The Navy uses this material on bulkheads to minimize internal shrapnel from external explosions. No clamp or other weighted object reduce rumble in my case. Probably in most cases.

Clcockrum: The ring I have is fairly light and isn't much help with most warped LPs. I used to own a VPI table and their peripheral ring worked wonders for warped records.

The TTWeights ring does nothing for my rumble problem, but if I recall there were more than 1 option of rings at TTWeights and I think I got the lightest one.

Well so far I've reversed phase, add damping fluid to my Triplanar arm, double checked level, tried raising lowering VTA, all to no avail.

Kevin at KAB suggested that his filter would be a bandaid and that damping should be the real solution, but unfortunately that didn't work.

Apart from trying a filter, I'm left with the notion of replacing the table, arm and/or cartridge, all very painful thoughts. :-(