Rippling cones

Great info. Thanks for the links to subsonic filters @noromance . Though I haven't had any problems lately but in the past I have had problems where my subwoofer(s) go into a frenzy. Though it appears to have been just one of them which was the closest to the TT. I assumed it to be airborne feedback from the sub through the cartridge which then looped back. IOW, feedback loop. The question then is whether the subsonic filter would take care of it. OR is this the same problemthat our OP is facing? 

@ hleeid , Thanks for the thread. Its a good topic.

@artemus_5 - tried moving the speakers away from the turntable.
Didn’t notice any change in the LS50s but looks like the larger drivers in the B&Ws seem a bit calmer.

@millercarbon So, I put the turntable on an old platform called ’’The Seismic Sink’’ I got from my uncle. The ’’Sink’’ is now on Audiocrast springs on the top of my equipment rack.

The room (15 x 19) is on the second floor with thick padded carpet over suspended wood floor.

Just noticed a weight imbalance among the 4 springs so will have to experiment with removing some of the individual springs from each spring unit.

Hopefully I can get around to getting things level soon and try again.

Also, my uncle gave me an old Vibraplane platform that weighs more than me! It has 3 air bladder type feet.

Is it worth the effort to get help muscling it up to replace the Seismic Sink?
I could then use the Sink under my Jolida tube integrated amp.

@noromance - have you tried either filter? quite the price difference!

I personally have used the KAB RF1 subsonic filter.  Solved my issue with rumble and even in a pretty expensive system (~60K retail), had no negative impact on sound.  I have not tried another option because this one worked very well

@hleeid,

I use the KAB rumble filter that the Cable Co sells, but I bought mine from KAB.  Your Rega being lightweight is not the problem.  My 40+ pound VPI Prime suffered from the same problem.  After trying a 4 inch thick maple slab, springs, pods, wall shelf, etc. I bought the KAB and have zero problems now.  
I have been using mine for 7 years and it is dead quiet, no noise, no hiss no nothing.  I run mine through a processor loop  on my preamp.  It is money well spent.

hleeid, you wouldn't. Feedback sounds like a howling noise. A cartridge that is too compliant for the tonearm can make this worse. A stiffer, less compliant cartridge might calm it down a little. If you want to know what is the environment and what is on the record simply put your stylus down on a stationary record and turn the volume up. Walk around the room watching the woofers. Jump a few times. This is the environment. What you see playing the record is a combination of the two. 

@cleeds , I respectfully disagree on this one. I have a number of records on which the rumble is atrocious. All records have some rumble to an extremely variable degree from almost dead quiet to ridiculous. The worst have been done rather recently, I suspect on poorly maintained older lathes. The rumble is usually rhythmical so I know it is the lathe. One record had me convinced my bearing had gone bad. 

As we have seen on a number of threads, low frequency trash can cause a lot of trouble with little cones. The LS 50s do nothing under 50 Hz so I would use a high pass filter set there and not only will the rumble stop but the speaker will get a lot cleaner and go louder safely. The other solution is to use a digital two way crossover and cross to subs at 100 Hz. MiniDSP makes a wonderful inexpensive one. Isolating a turntable is important but it will not fix this problem. This occurs with all systems but those with large woofers and subwoofers do not notice it as much unless they play really loud. Even so in a powerful full range system a high pass digital filter set a 18 Hz is a wonderful thing. You can use slopes as steep as 10th order without harm.