To clarify, the RIM drive itself is not noisy. What's happening is feedback beyond a certain volume level. I can still listen fine at moderate levels, but you do "hear" the RIM drive via resonances. Remember, horn speakers amplify everything 10 fold. Once you get past a certain volume level, then you get runaway feedback (low rumble growl). I believe what is happening is that the bass is creating resonances which are picked up by the RIM drive and then passed through to the table --> arm --> cart --> repeat.
If I didn't have a sub floor (and a better rack perhaps), then I suspect most of the issues would be resolved.
However, I think in my case, a belt drive would be better.
