That's not the source of any vibrations either. I am also using a Mark Kelly designed motor controller (think SDS), which makes the motor dead quiet. My TT itself weighs about 30 lbs (plus the motor which is about another 30 lbs). Each shelf is it's own seismic sink with 50 lbs of sand in them. Thanks for your suggestions, but I still think the problem is more inherent to the medium than my setup. I moved the speakers 2 feet away from the rack (increasing the separation between the two speakers) and solved the problem. My solution was to reconfigure the speaker placement making sure that it is further away from the TT. Even with the 50 hz cut off filter on my orions ASP, the feedback is still there. With plinths more than 60 lbs each not counting the TT on top of them, I thought I have a good isolation by mass loading from feedback or rumble (assuming it is not coming from the tt). You said your isolation is good, maybe it is not good enough. To be honest, one of the thing that I really hate on this hobby is rumble/acoustic feedback, another one is hum. What you described was one of the main reason why I sold it since I have a suspended floor, and acoustic feedback or rumble seems louder on it compared to other preamps I have including the Cornet 2. Have you tried moving the sub further away from the shelf supporting the tt? How far is your speakers to the TT? Your rack, floor if suspended, is moving. what methods have you tried to reduce subsonics that you have found effective? There was some brief discussion of this on Albert Porter's system thread. Mostly I leave the sub off when playing vinyl, but I would like to use it if possible.
But if I turn the sub on I get that extra low end pumping on some records that hurts my ears. So my isolation is very good - no thumps or thwacks on the rack coming through the speakers. Yes, I clean records thoroughly and there are no obvious warps, especially after being clamped. I use the 1 piece Delrin clamp on the TT. The phono stage is a Hagerman Trumpet (no built in subsonic filter and very wide bandwidth). All this on a rack spiked to a cement floor. The balls sit on another maple board floating in a 3" deep sand box. I have a DIY VPI Aries clone with a 1" thick Corian plinth, a Moerch DP6 tonearm and Dynavector 20X-H cartridge. Short of buying or building a subsonic filter (that will/may negatively affect your transparency) - what methods reduce subsonics (meaning the pumping of woofers and subs when a record is playing)? I know many of you have tried to address this issue.
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