Turntable isolation

I have my TT (Rega P7) on top of my audio cabinet. The cabinet is an Ethan Allen Townhouse component cabinet with a marble top. I noticed this weekend that when I touch the doors to my audio equipment I can hear a light thump via the cartridge. Even when I lightly tap the door the sound travels through the cabinet woodwork, through the marble to the cartridge. How can I isolate the TT from the rest of the cabinet?
Wall mount shelf is cheapest, surest method. Investing in isolation bases or adding weight might not deliver desired results.
If mounting on a wall is not an option? Then I would recommend an Ikea lack table. It would work well with your Rega and there cheap around 7.00 bucks.
Do you hear problems with your table's playback when you don't tap the cabinet? If not, why worry.
You could try isolating with AudioQuest sorbethane feet. Keep in mind that they most likely will solve or reduce the "thumping" problem but may also change the tonal quality. Another suggestion is Black Diamond racing cones and an isolation platform between the cones and the table feet.
In most homes/rooms, turntables are more stable on a low solid piece of furniture closer to the ground. This minimizes vibrations and effects.

Can you put the table on a separate low stand or table next to the taller component stand?

I keep all my components including table low to the ground on a rock solid oak wood coffee table (about 80 pounds weight). The table also sits on teh concrete house foundation which is thinly carpeted. Vibrations transmitted via the furniture is a total non issue.

A wall shelf as mentioned could be another option as mentioned. How well that works would be a function more of the room and wall construction and how rigid that is.

I do have a table in my second system sitting somewhat high up inside a tall and solidly constructed Ethan Allen audio cabinet (see my 2 Channel Family Room A/V System listing here on Agon). This system resides on teh second floor with typical modern wood joist based flooring found in most homes. This setup has less stability than the concrete foundation on the floor below. This works out OK in my case with the less finicky Dual table used there but is not as solid a setup overall. Yet it serves the purpose for that system.

They key is to have the table sit on the most rigid foundation overall as possible, however that might be best accomplished in your case.
Buy a bicycle tube, pump it up, place it below your turntable and you can close the chapter.
SYMPOSIUM Ultra Best by far mas means nothing without proper isolation!!
Look to Gingko audio. Simple concept, but it really works wonders!
Squash balls (or maybe raquet balls) in suishi type cups (Ikea maybe). Poor mans Gingko that works.

A butcher block on top of gel mouse pads. Total isolation on a ROCK solid platform.

I'm thinking about doing the same thing with my Thoerens TD125.

I just called a local granite counter top dealer and they said they can sell me a 24" x 24" x 2" piece of granite for about $35. Anyone see any issues?

I know in the manufacturing world they use granite slabs lifted by air, water, oil, etc to get truely flat and vibration free surfaces.
06-14-10: Drewmb1

A butcher block on top of gel mouse pads. Total isolation on a ROCK solid platform.
That's what I use under my Technics DD, except I use keyboard getl pads that run the width of the cutting board.

On the top side a set of PartsExpress brass cones are screwed into the bottom of the turntable with their adjustable points removed. This leaves a concave surface on the underside of the brass cones. This assembly is then placed on top of Vibrapod Cones. The steel balls of the Vibrapod Cones fit right into the truncated brass cones' concave surfaces.
I use an 4 inch thick block of mango wood, sitting on top of four 1 inch square erasers from the local school supplies store. This all sits on top of my teak stereo cabinet. Not a hint of vibration.
The sound of my Rega was greatly improved when I put 3 Cardas blox under the surround. Probably dominoes would work too.
This magnetic levitation stand looks interesting:

I second trying the slightly deflated tire tube (12" from Walmart) or the squash balls in cups. Both are puting you TT on AIR. This is where all front end componenets belong. IMO
Dear Listens2tubes,

I recommend trying first the balls and then putting butcher block or granite on top to see which sounds best. Mine sounded totally dead on top of my gel pads. I listened like that for a year thinking I really had it together. One day I thought why not try my unused butcher block. It was the difference between night and day. Which is preferable? Which ever sound works best for the owner. In my case I believed I needed a new turntable until I went to a rigid surface over an absorptive one. Now I'm thrilled.

If your walls don't vibrate much, a wall shelf is the only thing recommended here that will work. Batters, like pole magnets, and springs all are the same and like hard and soft feet have resonant frequencies which may or may not help.