Hmm ... I used a Symposium Ultra shelf under my VPI Scoutmaster for years without issue. I had a bad rumble issue with my Scoutmaster when using a phono stage without a subsonic filter, at that time I used a svelte shelf which didn't fix rumble.

I can only assume the Sym shelf is not compatible with your TT and associated gear, why I don't know, I would go back to wood console. Rumble is the pits, I hated seeing the woofers "flying".

I have never had any problems with rumble under my VPI Classic on top of my Symposium ISO platform (the one with springs). I never tried the VPI on a Svelte shelf. I put all of my other components on Stillpoints and then Svelte shelves and really like the way it sounds. I don't have a audiophile rack though. I would also just leave your VPI on the wood shelf if it sounds better. You can always use the platform under something else.

Hmmmmm....I wouldn't think it's the Symposium products. I have a Segue ISO under my Classic Signature and it worked wonders. I had my table sitting directly on the top shelf of my maple rack...now the table was quiet, but if you walked with a purpose or tapped the rack at all, you would get feedback through the interconnects/table. The Symposium product solved the problem 100%. It's all dead quiet now. Would you be able to post some pictures of the setup? That may help us see what's going on and give some more ideas.

- Buck

3D tone arm
 

I was having that issue with my Aries 3x3. My TT is on a 3.5" platform supported by isoblocks on top of my component stand. I first tried the KAB RF-1 rumble filter but I soon felt it was introducing noise to the system. I then moved my setup around, got the sub away from the TT and that helped quite a bit. One item that was brought to my attention on the VPI forum was the way the arm is setup. When I bought my TT I had the dealer set up the arm. I have since become more comfortable with the design of the 3D arm and arm board that I now do my own tweaking and checking on specs. I feel 50% of my issue was the way arm was initially setup. The base of the female bearing cup the uni-pivot fits into needs to be no further than 1/4" from top of the arm boards. The stability of the arm is compromised if the gap is larger than 1/4". I would first check your arm for this critical step. If your gap is too large you can adjust it by using an allen wrench on the adjustment nut through the top of the arm above the pivot point CCW turn will lower the cup. Once you adjust for the correct gap between base of bearing cup/tone arm and top of arm board then using the on-the-fly VTA adjustment raise your arm board until arm is parallel with LP surface. This will get you in the ball park for a starting point for VTA adjustment. My Cadenza Black gets good results with the tail of the tone arm just a bit high. Pic attached is of tone arm prior to lowering down closer to arm board.

I ended up reinserting the KAB filter and removed spikes from platform. The platform rests upon isoblocks with a layer of Herbies grungebuster between blocks an platform. All seems Ok for now

It all depends on the floor you have and then the rack. I have a concrete slab with no basement. No special rack. My Classic 3SE set on 2" maple butcher block with thick sorbothane pads under then the rack. It works for me . Love the table. A forever piece.