Brinkmann vs TW Acustic

Peterayer,

Thank you for explaining in more detail. This thread isn't making too much sense. Too many contradictions.

I am surprised you needed isolation for your SME. I thought the O rings would do the trick. But when I think about it, it makes sense. Nothing is as god as a separate platform. The first time I "heard" my Raven was after isolating it. Even concrete floors make standing waves.

I just don't believe any turntable can be judged until isolated. I hunk the best solution is a singular isolation system for the entire analogu system, and maybe Independant platforms to absorb energy on top of the isolation platform separating the motor and turntable. Maybe even the Tonearms if you want to be obsessive. I am just happy so don't worry too much. I just need better vinyl or really the Audio Desk system so I can get more listening time.

Dgad, There are two other things that could account for the improvement to the already good isolation of the O rings on the SME. First, the table is sitting on a different surface now. I tried it briefly on the wood top shelf of my DIY rack. Not it is on 286 lbs of steel and so the energy is draining down into a larger mass. Second, the motor controller is now isolated on the steel and Vibraplane from floor born vibrations.. Both contribute to the improvement.

"This is a cardinal sin of bad belt-drive turntable design. (The commercial product analog is to use a suspended chassis bearing the platter and tonearm whilst the motor drive is fixed to the inert plinth.) This results in some of the most obvious "wow" that I've ever heard in vinyl reproduction. The original AR turntable was guilty of that infraction, as were the early SOTA turntables. Especially, to put the turntable on a Vibraplane or similar device and the motor on an inert shelf system is asking for trouble."

Good point Lew...
My previous T/T (an LP12) was prone to a phenomenon some referred to as "breathing". (Note this could also be related to platter balance issues)
If you positioned your eyes level with the platter and checked the top plate clearance you could see the platter edge/clearance oscillate due to the pull of the belt.

The turntable sounded very musical despite this effect :)
Kind regards.....

Ct0157
FWIW my TW AC with BN PSU and 3 motor unit takes 8 seconds for the platter to come to a complete halt after pressing the stop button and with the tone arm at rest

Cto157
My Raven AC with 3 motors. Two at the side and one at the back takes 6.7 seconds to stop based on 4 samples.

Cheers