Isolation platform for non suspended turntable?

I have been using one of Barry Kohan's Bright Star Gemini isolation platforms under my VPI TNT for the last four+ years. It has been an excellent performer. My room is not an easy one from an isolation standpoint, as I have a full range, high-powered system in a room with a suspended wood floor and a DIY rack that does not itself provide much in the way of isolation. (I'm working on the rack part.)

I had significant feedback problems with my analog rig before I installed the Bright Star Gemini isolation base. The Gemini isolation base seemingly cured all the noise feedback problems, and I have been content with the Bright Star base ever since. (Unfortunately, however, I will have to move on to a new base whenever I finally decide to pull the trigger on upgrading my TNT to include the flywheel, as that will cause me to outgrow my current base.)

I am also using the Silent Running Audio custom isolation bases under my amps, and I am VERY impressed with their performance. So I would put in a vote of confidence for the SRA products as well.

I like the Machina Dynamica Promethean Base.

Vibration control products that are constructed from materials that ring (stone, metal, glass, etc.) or materials that resonate (wood, acrylic, plexiglas, plastic, etc.) should be avoided.

What does that leave? :-)

Try this:

http://home.att.net/~ptmconsulting/wsb/html/view.cgi-photo.html--SiteID-664443.html

Maple butcher block under the TT with DIY rollerblocks under that. Worked better that anything spongy that I tried. Better isolation from the kids running through the room. Great focus, musicality, speed and dynamics. Spongy things tended to creat a mushy sound and had less effective child born vibration isolation :-)

Another option would be to build a sand base seismic sink type of device (if you have the room for it and can bear the extra weight).

Enjoy,
Bob

Bob, I could never float that past the wife. Seriously low WAF. I've got a 1/2 piece of plexiglass sitting on some vibrapods. This set up eliminated a ton of feedback I was getting. My "rack" is a decorative wall unit and is fairly unstable. Without the platform I couldn't even listen to my TT, the feedback was so bad. Now it's fine. Good enough, anyway.