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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
mingles
796 posts
 
What device do you recommend for a rumble filter? Of course, some phono stages have it built in, but if the one you own doesn't, what do you recommend?
stringreen's avatar
stringreen
6,470 posts
 
Are you sure your cartridge/arm interface is correct? What cartridge are you using?
4est
507 posts
 
What exactly is your wall shelf design- no offense.

Otherwise maybe just change where it is at on the wall a little as it may be at a resonance frequency. A photo would help a lot.
stereo5's avatar
stereo5
6,407 posts
 
I had the same problem with my VPI Scout turntable. I tried everything, then bought a KAB rumble filter. It worked like magic and did not subtract any bass from the music. There is a used one here in the classifieds for 99.00. I paid 169.00 plus shipping for mine, new. You insert the filter through the tape loop and when you play records, put the tape monitor to tape or it can be installed between the pre and power amp.

Bob
jamo1
16 posts
 
If possible, have the wall shelf attached to an outside wall or strucural inside wall as mentioned(behind the speaker plane). Try to set up the shelf so that it is not rigidly coupled to the wall, don't over tighten the screws and perhaps put rubber washers as spacers behind brackets at wall. Then decouple the table from the shelf surface by putting a seperate MDF board or buthcher block on it seperating it with cones,vibrapods,small spikes,rubber/plastic pads etc. Take the lid completely off while playing(antenna for airborn vibrations) also mentioned. Give the cartridge bolts a good tightening and make sure the tonearm bearing is not loose. If this don't help I would say you need a better table.
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