AVS Special Member
Join Date: Mar 2007
Location: Long Beach, California
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There are two vibration issues anytime you place a turntable. I suspect you are more concerned with the first.
The first are the vibrations coupled to whatever the turntable is sitting on, like your footsteps shaking the floor where the turntable's floor unit sits. Or closing a cabinet door on the same wall as your glass shelf.
The second are the vibrations caused by the music, vibrating your LP and possibly causing distortion or feedback. This is only a problem if you play your music loud.
Mass-loaded vinyl is very good for sound-proofing, but not very good at isolating vibration. Sorbothane is very good with vibration (I've used it a lot in industrial equipment). Since you have the mass-loaded vinyl already, it certainly won't hurt. But, depending on the structure of your wall, you might still have vibration issues.
I would recommend sorbothane, but I wouldn't trust just four little feet. Low durometer Sorbothane is only effective under light compression, and higher durometer sorbothane is not as effective for low frequencies. Those feet are 50 durometer, which I feel may be too stiff. My technique (but never used for a TT) is to use a 1/2" thick sheet of 30-durometer sorbathane between two stiff surfaces. A second sheet of glass on top of sorbothane should work well for you.
Then again, your turntable might have very good vibration isolation already. All of mine do.
Neither of those materials will help much for the loud-music issue, but a good dust-cover helps a lot there.