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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 artemus_5

artemus_5's avatar
artemus_5
1,992 posts
 
I'm late to this thread but hopefully helpful. I am a builder with 50 yrs experience. 2x4's are your friend. They are plentiful and cheap. I reinforced my floor where the stereo system sits. Speakers weigh 135 lbs a piece. Turntable weighs over 100 lbs. It is atop a sand box which is part of a custom made rack which has concrete inside the legs. 
Under the house you just need to put some 4" solid blocks down on the ground. Or put them down in a hole. These act as a foundation. Saves time with concrete which isn't necessary. Span 2 floor joists under the stereo system with a 2x4. Put a 2x4 upright up to the spanner board mid way between the joists. Do this on 3 ft increments. That is plenty of reinforcement for a 2 x 10 floor joist system. If 2x8 system, use 2 ft increments. I can jump up and down in front of my TT while its playing.

Remember, the floor system has been engineered to withstand standard foot traffic. Consider that you have a refrigerator in your kitchen which weighs 300 lbs and only has 6 sf to carry that load. So its not like you have to engineer from scratch. You just need to reinforce whats there. My ScoutMaster worked great on a sand box.
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