How to eliminate TT feedback/vibration


1st Thing I will tell you - I have an OLD TT. It's a Pioneer PL-71. ( I'm looking at a Clearaudio CMB ) My TT is placed out in front and to the left of my left speaker(per Jim Smith's book.) I made a platform of MDF attached to the wall where my TT sits. At no point does the platform contact the floor. When I play certain albums-several in fact, at mid to high db levels, I get either an acoustical feedback or vibration feedback from low hz. I have tried to isolate my TT using something like sorbuthane balls and foam. I have not tried any of the commercial cone devices advertised. (Do they really work and if so-what's the best product?-no salesmen please). I don't know if my problem lies with my TT, or my platform it's sitting on. I have a friend who actually hung his TT from the ceiling years ago, and I may have to do the same. Thought I would inquire if anyone knew the answer before I started experimenting. Will a higher end TT like the Clearaudio cure my problem? Is it the platform I made-or do I simply need some isolation cones?
handymann

Showing 2 responses by auxetophone

If possible, try lowering the stylus on a disc without the platter turning, and then rapping on the wall, platter, plinth, platform etc with volume at realistic loud levels to get some insight into what is happening.

This may help you avoid less-promising approaches, and more quickly evaluate potential cures.

Keep in mind also that although a rumble filter will probably help, ideally you would eliminate the problem at it's source (assuming that's feasible), since your cartridge and phono stage are processing that rumble even when you filter it out.
Here are various Sorbothane devices. One of them may work for you:

http://www.amazon.com/s/ref=bl_sr_hi?_encoding=UTF8&node=228013&field-brandtextbin=Isolate%20It%21