From my trial and error experimentation I've come to the same conclusion as TWL and Dougdeacon. Unsuspended turntables don't sound good with spongy isolation beneath them. Now that doesn't mean you can't use some form of vibration damping or isolation - just don't use spongy stuff.
I would love to build a seismic sink (aka sand box), but my situation doesn't allow it. Here's what I improvised, and it works great for me:
http://home.att.net/~ptmconsulting/wsb/html/view.cgi-photo.html--SiteID-664443.html
TT on a maple butcher block, with DIY rollerblocks underneath. My kids can run through the room without skipping the needle. And the sound is quick and detailed and musical.
Enjoy,
Bob
I would love to build a seismic sink (aka sand box), but my situation doesn't allow it. Here's what I improvised, and it works great for me:
http://home.att.net/~ptmconsulting/wsb/html/view.cgi-photo.html--SiteID-664443.html
TT on a maple butcher block, with DIY rollerblocks underneath. My kids can run through the room without skipping the needle. And the sound is quick and detailed and musical.
Enjoy,
Bob