VPI acrylic vs. aluminum

melm: With all due respect, I've read through this discussion a few times. Even though I've tried to explain my personal experiences with these differing platters/bearings, you have, (without as much personal experience, as you stated), have again & again asked questions that show that lack of experience or thoughtfull reasoning that should be considered here. The questions you've continued to ask, show this. It seems you have either an unwillingness to accept others' personal experience without careful thought or the fact that ongoing improvements in mechanical design/machining tolerances, just may be an improvement to your listening experience. For these reasons, I will not post here again.

I only hope the OP has gained some insight here.

I hope you all have a good day.

What is a mag/level platter?

Here's the platter: http://www.avsforum.com/forum/imagehosting/75530955554817eb537e.jpg

There is a gap between the top and bottom platters. A belt-drive motor spins the lower segment while magnets link the top and bottom.

I like this

Just a word for the OP who may feel neglected in all of this.  

I think in his original question you hit the nail on the head.  The acrylic platter (by which I assume meant the acrylic ONLY platter) has real sonic advantages.  The heavy aluminum platter has the principal advantage IMO of being heavy; it weighs 20 lbs; the acrylic weighs only a fraction of that.  The acrylic/lead or the acrylic/steel (super) platters offer the best of both worlds IMO.

As I have written above I don't think the type of bearing matters, only the quality.

If I had a VPI acrylic platter, which I think has almost no value on the used market, I would try to find some way of adding weight to it.  If there's enough clearance one might find a thick 12" diameter steel plate and glue to the underside of the platter.  Or one could try to emulate platters like on the Teres and drill holes in the platter, perhaps from the bottom, and fill with them with lead.  Or rout out a deep and wide circle in the bottom of the platter to fill with lead.  Or something like that.