is turntable isolation required?


I have read opinions saying that solid plinth turntables absolutely require some kind of isolation platform to sound their best. Would you say this is correct?

my Thorens TD-850 weighs 21 kg, very solid plinth, sits on spiked feet that have a small, built-in layer of what appears to be viscoelastic material (presumably providing a very small amount of isolation), on a Billy Bags stand. Solid floor. I had it on a Bright Star (sandbox-type) platform, but couldn't really hear much difference, if any, with or without it.

If I'm likely to hear a real benefit an HRS S-1 platform looks appealing. Other recommendations welcome.

that it be cost-effective might be too much to ask, in this hobby.
128x128lloydc
Post removed 
I think it all depends on your turntable.... Linn tables love to be on a very light table since the resonance of that light table will be disipated by the suspension of the turntable. VPI's on the other hand love to have a heavy, solid table to rest on. I had a Thorens at one time, but don't remember what I used. I suggest you try different things and see what happens.Your Thorens has a spring suspension ...from what I read, you have a very solid footing for the table except for those viscoelastic barriers. Try removing them which would give you great solidity, and see if that is any improvement.
Hi Lloydc, yes and no and depends on your table

If I was you I would do some searches and try and find some others with the same or similar table and see what they have done.

I have my table set-up where the floor moves a bit, I tried HRS "still own" and a few others but in the end got a Minus K platform and have never looked back. Depending on the size of your table you might be able to utilize their standard size offerings, unfortuantely mine was a custom size.
Unless you have shielded it from acoustic energy that is created as you play, it is not fully isolated, not matter the 'bricks and brac'. Moving it to another isolated room is generally the best way.