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Advise on TT Support Platform

Hello All-
  This is what I plan to do and would appreciate any comments on my idea. I have (soon to be delivered) a new VPI Prime TT and plan to place it on the 1st floor of my residence which has a hardwood floor. Under the floor is a 5' crawl space with dirt bottom, the house is supported on poured concrete footings & 5' poured concrete walls.

  I plan to drill a 1.25" hole through the floor and run a 3/4" dia. black pipe (gas line) through it. The base of the pipe will be sunk into a 2' x 8" dia hole and filled with concrete while the pipe is centered within the hole with .25" of clearance surrounding it (isolating it) from the hardwood floor. The pipe would further be secured with 3 wire stays on turnbuckles ( as an antenna ) to alleviate any chance of pipe movement. The stays would attach to the pipe near the underside of floor & anchored into concrete foundation walls, then tightened down. The top (terminal) aspect of the pipe would have a black iron pipe flange screwed onto it at the determined TT height.  A 21" x 21" x 3" maple platform https://www.dawnsdepot.com/product-page/dawn-s-depot-maple-audio-isolation-platform-aud21213-21-x-21-x-3  would be bolted to this flange, to which the Prime would set upon.

  Further, I would install the Symposium VPI Prime Footer Insert Kit https://www.highdeftapetransfers.com/products/symposium-vpi-classic-footer-inserts   More on that here also: https://www.thecableco.com/Product/Classic-Footer-Damping-Insert-Kit 

   I'm thinking this will totally eliminate any footfall problems for good and create a internal TT & external platform/TT vibration and resonance grounding pathway to handle those issues.

  So, I'm looking at this as if the vibrations and resonance energies within the TT and those of the platform will be conducted as if they were electrical in nature and simply being lead to ground and dissipated. A note in this regard, my T.V. antenna grounding rod was buried 6' deep in case of a lightening strike in contrast to my 2' concrete filled hole for the 3/4" dia pipe.

  The TT is essentially coupled to the maple platform, and the maple bolted (coupled) to the flange & flange to pipe, pipe to ground.

 Is this sound? or do I have it all wrong?
robes

Showing 1 response by bsavage

bsavage
27 posts
 
I have a VPI Classic 3 with the Symposium Classic Footer Damping Insert kit. My listening room is on the second floor above the garage with no supports underneath it but the floor joists. When I would place the stylus on a motionless record and walk across the floor near the equipment rack, I could hear my footfalls through the speakers. Tapping on the side of the equipment rack would also produce fairly pronounced thumps through the speakers. 

I installed the Symposium Segue ISO Platform on the top shelf of the rack under my Classic 3 and now experience no sound through the speakers at all when jumping up and down on the floor in front of the rack with the stylus sitting in the groove of a motionless record. Tapping on the side of the rack still produces a faint sound from the speakers, but I would estimate it is reduced in output by 80%. 

The Symposium Segue ISO is a very easy and quick solution to implement and in my situation does a fantastic job of isolating the turntable from footfalls and most other external disturbances. I highly recommend it.
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