Clearaudio Master Innovation Assembly pics

^^^ Sorry Kostas..I have no listening experience with the Master Reference.

Dear Rockitman,
So as far as I can determine, that lower platter, which appears to be made of acrylic, has magnets imbedded in it. It is driven by the belt. The upper platter assembly is driven by the magnetic attraction between its base and the magnets in the lower driver platter, i.e., magnetic coupling. Is that correct? As a consequence, a magnetic force pulls the lower platter up toward the upper one and also pulls the upper platter downward, reciprocally. Is that the case?
Whilst making your decision to purchase, did you also consider the EAR turntable that apparently works by a similar principle?
Or the Verdier?

Lewm,

The lower acrylic platter has magnets as does the top acrylic platter. The bottom platter sits where it is due to the weight of it and the heavy stainless sub platter riding on a traditional brass bushing bearing. The upper acrylic magentic platter is attached via a shaft to the record platter up top and they both ride (Float) on one ceramic magnetic bearing. The magnetic bearing levitates both the record platter and the upper acrylic magnetic drive platter so the magnets between both magnetic drive platters never touch....the magnetic force is not that strong between the two. The speed accuracy is stunning for a belt drive. I suspect that even though there is a low compliant issue with magnetic force (ie: play), in my mind it helps the speed consistency as we are talking about almost zero friction with the magnetic bearing, optical speed control and a lot of spinning mass....close to 50lbs. Any micro speed deviation happening with the belt/motor driven platter are offset by the rotational mass, frictionless bearing and the compliance of the magnetic force which imo, helps to absorb any micro speed variation by the belt driven platter.

I did not consider any other turntable.

it's a beautiful piece of workmanship. Use it in good health.
I am still trying to understand the drive system. You wrote, "The upper acrylic magentic platter is attached via a shaft to the record platter up top and they both ride (Float) on one ceramic magnetic bearing. The magnetic bearing levitates both the record platter and the upper acrylic magnetic drive platter so the magnets between both magnetic drive platters never touch....the magnetic force is not that strong between the two."
I don't quite get what is levitated and what is driving what (because in the photos I don't see any open space between the stainless steel part of the lower platter and the white acrylic part and similarly for the two parts of the upper platter), but I will take a look at the Clearaudio website. The idea I get from what you wrote above is that BOTH platters are magnetically levitated in the vertical direction and that the lower platter drives the upper platter via magnetic interaction in the horizontal plane, but in the vertical plane the space between the two composite platters is effected by mechanical means (a shaft). Thus the upper composite platter (ss and black acrylic) is constrained mechanically from moving out of line with the lower one (by the shaft), but is rotated magnetically. Anyway, it is obviously ingenious.

Hi Lewm...hard to put it in words. If you are familiar with the CA Innovation, you know when you put downward force on the platter, the platter goes down a bit, then pops back up when you remove the downward force, hence the platter magnetic floating concept I alluded to. With the Master, the CMB is sealed so I could not see it. There is a rigid shaft that holds the upper magentic patter to the delrin record platter. It's a rigid connection. Some how that shaft that rigidly couples to upper mag platter with the record platter is supported by the magnetic bearing, hence the float. When I put downward force on the record platter, the upper mag platter also moves down, but not far enough to make physical contact with the lower acrylic drive platter that has the belt on it.

Interesting that the Clearaudio site still has no info or mention of the Master Innovation.