I don’t think there’s a simple answer to this question. It depends on the floor, the rack, and the turntable. I’d try different things. I have 2 turntables. My equipment rack has 3" wood maple shelves that sit on small sorbothane bumpers and it sits on a concrete floor. The TT is more than 8’ away from the speakers (as noted, the further away the better).
My old HW-19 VPI TT (unsuspended) sounds best with an older variant of Herbies sorbothane pucks underneath it. I didn’t like the sound of them under my TW Acustic TT (122 lbs!). However, with the TW, I still hear some noise from the speakers if I rap hard enough on the wood maple shelf it sits on, so it’s not yet fully optimized.
I’d buy several cheap isolators people suggested or make your own (skip the Spam & DelMonte except for dinner?) and try them all out. Good luck experimenting!
My old HW-19 VPI TT (unsuspended) sounds best with an older variant of Herbies sorbothane pucks underneath it. I didn’t like the sound of them under my TW Acustic TT (122 lbs!). However, with the TW, I still hear some noise from the speakers if I rap hard enough on the wood maple shelf it sits on, so it’s not yet fully optimized.
I’d buy several cheap isolators people suggested or make your own (skip the Spam & DelMonte except for dinner?) and try them all out. Good luck experimenting!