2. analog
  3. 137975-111474

VPI Classic 1 isolation upgrade

Hi! I would like to upgrade the isolation of my VPI Classic. I have the following right now:The TT is resting on the top of my custom made rack. The top plate is a 2" MDF what is on "Herbies fat dots" dividing between the lower part of the rack for the phono. There is about 5" sand on that plate.On the sand, I sandwiched an inflated tube between a tile and an 1" MDF. The sandwiched layers are not touching the side of the rack, just the sand, and I used a straw to cancel the vacuum.

I was thinking about the following:
1. Symposium VPI legs + Rollerblock jr s under directly
2. Terrastone VPI legs + Terrastone rollerbearing under
3. Symposium VPI legs + Symposium Segue ISO
4. Change the upper MDF plate to marble, leave the mdf or the tile on the sand + any of the firts two options
Which one would you choose? I dont really see the need of the Segue , I think I could rather improve the lateral isolation with roller bearing.



128x128korakotta
geoffkait's avatar
geoffkait
23,365 posts
 
When I showed with Golden Sound at CES I had the local Las Vegas stone place cut a bunch of black Italian marble slabs for use in my Promethean mass on spring iso stands, two slabs per iso stand for total of about 8 marble slabs. Marble and granite and bluestone work great in mass on spring installations due to their inherent mass and stiffness. Any tendency of these materials to ring is minimized due to isolation of the top plate as well as the component on the top plate. Also, damping can be applied to the top plate to address any residual vibration. The only downside was shipping costs of the marble slabs back East. 😛
bdp24's avatar
bdp24
9,816 posts
 

You can't get Baltic Birch plywood in Norway? It's imported into the U.S.A. from Scandinavia, where the world's supply comes from! I'm half Norwegian myself (surname Jerde), my great-great grandfather immigrating in the 19th century to Minnesota, then onto South Dakoda.

There are two products great for constrained-layer damping: EAR IsoDamp (Kait doesn't like it though) and WallDamp by Acoustic Science Corp. (the Tube Trap company). And of course Sorbothane. A layer of any of them between two pieces of very stiff material makes for a great shelf.

I have no experience with Shun Mook, that whole concept of which I am dubious.

korakotta's avatar
korakotta OP
50 posts
 
Yes, it`s pretty difficult. They say, there is some difference between the norwegian birch and the baltic. Can it be sufficient?

Shun Mook concept. 50% of the internet are raving about the sound, 50% think that`s just a hoax. I think the truth is something in between. For me, it`s convining enough to pay for the legs. Let`s see what`s coming after.  
geoffkait's avatar
geoffkait
23,365 posts
 
Trust me, you can disregard anyone who says it’s a hoax. They’re just flapping their gums. So the real answer isn’t somewhere in between. There is no between. Do the math.

Baltic birch plywood is a very good material and easily obtained. 
More to discover