garrard vs clearaudio innovation

Mijostyn what cartridge are you using on your SOTA and Kuzma?

jam759, In the arm now is a Clearaudio Da Vinci v2. I have an Ortofon Windfeld Ti in the second head shell.

How good is speed accuracy and rumble on Idler drives?

I have four Velodyne dd18+ subwoofers, in stereo bass stacks outside of my Focal Stella Utopias. Turntables are Kodo the Beat and Artisan Fidelity 301 Statement.
I get zero rumble from either, and i play bass driven electronica - deep house, drum and bass, hip hop- at valley-shaking volumes.
Rack is an Artesania Esoteryc (sic)

tzh21, speed accuracy can be excellent but they will always be noisier due to the multiple moving parts. Even if they start off relatively quiet wear on the idler wheel will eventually increase the noise (rumble).
Idler wheel tables persisted in the commercial world because it is easier to cue an idler wheel table. If you don't know how disc jockey's cued records, they held the platter still with their left hand, placed the tonearm on the record at the beginning of the cut they wanted to play then "jockeyed" the platter back and forth to the very beginning of the cut and right on time they let the platter go. Finally the idler wheel tables were replaced by direct drive units which were even better at this. You can not use belt drive tables this way. 
gavman there is no such thing as zero rumble in a turntable.