Feedback through turntable

My main listening room is on the second floor, carpeted on a suspended subfloor.  I do not have the luxury of moving the sound system away from the speakers due purely to room size (15' x 15' x 8') and layout (open on two sides - second floor game/media room).  I feel my table is shielded from mechanical vibrations.  The VPI Aries 3D has the mini-HRX feet, this sits upon a 2.5" layered birch platform with a cork top which is on 4 isoblocks that sit on my marble-topped audio console.

My main listening room is on the second floor, carpeted on a suspended subfloor

Is the 1st floor,  the main house floor also suspended ?  Do both floors use horizontal wood beams? 

miner42,

Did you ever try ct0517's dance tip? If you are embarrassed to dance, follow his directions without the dance. If you're getting the low frequency noise this way, something in your tt isolation chain is not set-up right or is not able to isolate effectively for your particular situation.

What type of audio console are you using?

If you haven't already watched the Townshend Audio YouTube video showing how a speaker on a concrete floor reacts to vibrations, you should. (bdp24 has talked about this in other threads).

Then think about if a speaker on a concrete floor has this much vulnerability to vibrations, surely your tt on a second story will be magnified multiple times over.

Food for thought.

I have been to older audio friends homes where their children have left. (yeah right - will believe it when it happens to me) ......anyway.

So the couple, find themselves with an empty bedroom/s upstairs; Usually (She) doesn’t want the stereo on the main floor. So usually (He) is forced to use one of the bedrooms upstairs. All wood suspended floors have the capability to produce what I call the 6 O’Clock train effect as bass and volume increases. And the higher you go 1-2-3 suspended floors, the worse the effect can get.

All it takes is one of the full range speakers and or sub to be placed above one of the same horizontal beams, as the one the turntable stand sits on. They become joined at the hip - so to speak. As the volume increases, its like that 6 O clock train going by. A suspended floor is never an ideal spot for a resolving turntable. If the problem is bad enough and keeping you from enjoying your system at those levels that get the .....endorphins flowing..... then...

locate the nearest main side wall that supports the house. Not that flimsy wood studded wall between rooms. Attach a shelf/ves to one of the main support walls. Another option - a little more extreme.... is to hang the shelf from the ceiling. 8^0

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then there is the other fellow, same suspended floors, that puts all the gear in one room except the speakers. The speakers go in the room next door.
But guess what - they are still sharing the same horizontal wood beam - so - still joined at the hip ...... guess what happens....

thats right ..choooo. choooo !! some Sat morning funny