Why do my bass drivers shake violently listening to vinyl

@audionoobie
I kindly ask that you post your solution after you get this problem solved. I'm just curious

As a long shot remove the dustcover!

I have a TT and cart combo that will blow a normal sub 80 hz < but with servo plate amps and servo correction, it’s a tame, deep, very clear bass signal to 25 hz. I’ve always used a spring suspension and gummy puffers for isolation.. A heavy ply plinth, rubber line and spring load the bottom with springs or an inner tube. I use Thoren TD124s and Russco.

The main speakers can’t pump because the bass is cut from 280< and from 100-300hz are bass columns. My system CAN’T pump!! You can throw the TT in the middle of the room... Servo is pretty cool.. ;-)

I use up to 6 12" OB HE drivers. Maybe 100 watts to each driver @ 8 ohms. 100hz < no TT problems..:-)

Regards

Millercarbon, so far you have been totally and completely off base twice in this thread. The OPs problem has nothing to do with the turntable's location. Isolating it will do absolutely nothing. If there is a cartridge mismatch improving that will help otherwise his system is appropriately amplifying the signal that the cartridge is picking up. With smaller woofers this causes excess movement. Next. Stopping that excess movement results in a large improvement in sound quality because of the marked decrease in several forms of distortion. It also results in greater headroom because power is not being wasted. The improvement a subsonic filter will make will be far in excess of any problems it might cause. 
@lewm, subsonic filters are not complicated issues in the digital world, you just program one in. I know this rubs you the wrong way but personally I do not like being stuck in the past. Digital reproduction has advantages that can not be matched in the analog world and the advantages outweigh the disadvantages. I am dead certain you would agree if you could hear it in action. 

I agree with those who say before you do anything, try another turntable in your system at the same location. Whether or not you get the woofer excursion with the second table will determine what to do next. Before you can solve your problem, you have to know what the problem is.