recommendation for turntable vibration damping


hi!
i recently moved into a new home and just completed a project to install insulation under the floor (in the crawlspace). this was done to save on heating costs, but i figured it would also help to dampen vibration from the floor. the floors themselves are fairly cheap with thin carpet over them. (we are likely to install hardwood floors in about a year or so.)

anyway, after the insulation project was complete, i noticed that if i tapped my foot (as in moderate footstep), i could see my turntable shake. i'm wondering what steps i could take to reduce this vibration.

here are some relevant details:
>> VPI Aries on a Bright Star Air Mass 19, sitting atop a...
>> Finite Elemente "Spider" rack built up about 24" with a preamplifier, CD player, and VPI SDS also on it/weighing it down.

the rack is modular (which has served me well during a few moves) and is lightweight.

i'm wondering what my options are for reducing vibration -- i don't think i can afford a big/heavy rack right now.

is something like a bright star 'big rock' advisable? i would imagine loading it down with sand would really weigh down the rack and, presumably, dampen vibration. (they're not cheap, though...especially for the size i need for an original aries. i don't have an outboard flywheel, but i may get one one day.)

i'm open to any thoughts.

thank you in advance.
ebalog
You could put supports under your floor joists to stop the bouncing effect your experiencing. I take it since you insulated the floor you have access to them from your basement.
Have a look at either a Grand Prix Isolation Rack or a Vibraplane shock-proof table...

If your system 'shakes' when you tap your foot on the floor then even the best isolation system will not be of any help. Have you considered to maybe wall-mount the system?

Regards,
Dewald Visser
Since you have access under the floor, you can support the area directly under your turntable by shoring up between joists and the earth.

Believe it or not, cheap automotive scissor jacks work very well. Put a couple of cinder blocks or concrete paver stones on the earth, put the scissor jack on top and twist the gears until it snugly contacts the beams.

Better yet, if you have room to pull a 2X2 or 4X4 through the scuttle hole, you can drag that over to where the joists are (under the turntable) and bring the jack up snugly against it.

Even a slight bit of extra support will make a world of difference. I have these under my floor, purchased a half dozen cheap jacks at Pep Boys automotive and did it myself.
Target wall mounted turntable shelves are simply the way to go.

Damping your turntable's chassis is so trendy but few realize it can also suck the soul out of it. Try the wall mounted shelf first; It's cheap and EXTREMELY effective!!