Turntable Causes Speaker Cones To Excessively Move Rapidly

@dman777 ,

I used a ZU/Denon DL103, Gold Note Vasari Gold MM cartridge and a Benz Micro Glider.  Same happened with all of the cartridges, excessive woofer pumping.  I tried 3 different platforms for the Prime, a solid granite sitting on Cones, a large base custom made by Audiophile Vibration Control and a Mapleshade platform.  Nothing helped except moving the turntable to a different room.  My Technics SL1200G has excellent chassis damping and all the cartridges mentioned work very well with the Technics.

@andyhifiman can you tell me please, was that a techniques turntable where the screws are loose? And what model?

Hello dman777,

In my situation I am using a Clearaudio Performance DC turntable with a Universal 9 inch tonearm and this happens to be a belt driven model. The issue in your case may still come from some part in the turntable not properly affixed. Yours being a direct drive turntable may still have something loose or rubbing against another part.

@andyhifiman if I can ask please, how did you find out? Did you take it to the shop and they found the issue? Was it the original place you bought it from or a repair shop?

Did you remove the cover and put the turntable on some kind isolating platform?