Other than the noise, can you feel any vibration from the motor housing? FWIW, I have a Hurst 300 rpm synchronous motor that is not attached to the plinth of my TT. My TT's performance increased when I plugged it into an Exact Power balanced transformer. The motor is silent, but wasn't all that noisy to begin with. So slight improvement there. I plugged it into the Exact Power unit out of convenience more than anything else. The improvement in clarity & sound stage was an unexpected plus.