Woofers Gone Wild

Is this happening with all LPs? Cone weaving occurs at a few hz is likely caused by warped LPs. You can see the disk surface ripples whils spinning. Other cause could be grossly mismatched arm mass and cartridge compliance. If you use Rega and Sumiko it is not likely the case. Personally I would not use rumble filter to cure cone weave.

I have woofer pumping too. My TT is well isolated. Although it is very near one of my speakers it is on a sandbox. I tried an experiment, bought a cheap very long cable, and put the TT in another room. It didn't help at all. The thing is that the pumping I get is different depending on the record being played. My solution was to stop worrying about it although the KAB rumble filter does look tempting - do you put it between the phono stage and the amp?

DS

Davidsss, my suggestion is the same for you; if you can, try a cartridge that has a lower compliance figure. That will reduce the woofer 'wobble' and actually improve the bass at the same time.

whatever you do, contrary to what some people might say, though not on this thread yet, it can damage your speakers. I blew out a woofer on an Aerial 10T twice because of infrasonic info being passed to my speakers. Mike Kelly had to chastise me to use the rumble filter on the pre I had at the time

I understand the sentiment of the purist approach to this problem, but I wonder how many of the purists actually used the filter and can offer meaningful advice. Saying it filters ergo it wrongs the signal is, in my opinion, a simplistic theoretical approach that does little to shed any light on its actual real life effect. I've been using the filter for a few months now and don't look back. I have no doubt that the woofer fluttering caused more deterioration to the sound that removing frequencies from the signal that can't even be heard. And warps often have little to do with the fluttering; the worse woofer pumping I noticed happened with a perfectly flat 200 gr record. And yes, my cartridge/tonearm matching is spot on.