Vibraplane

I don't see the advantage of an additional active,air suspension,if you have a high mass table on a concrete floor.Provided it has a superb stand.I could be wrong,but wouln't the solid stand/high mass table better be able to evacuate resonances?

Cello,in response to your question,it would seem that the Vibraplane would work best if the flooring was wood.Both my friends had a non suspended table(like yours)on a wooden floor.Hence,the Vibraplane was a clear improvement.
I don't remember if your flooring was concrete(I think it was solid),but it would make a difference,as I'm sure you know.If so,you may be better off with a "solid dense" platform,like somethong from SRA!

I had a Bright Star air mass under a table for a few years.It was a very nicely designed product,but you must be VERY careful to balance the table above it.The air bladder required a few pumps of air about every two weeks.It was a breeze to do.Darn nice product,but be careful of maximum weight allowed for the particular product that sits above it.

Best!

Thomas,I have two friends using the active units.Both used to run VPI TNT model 6,with both using Air Tangent arms.The results,as compared to everything else they tried,weighed heavily in favor of the Vibraplane.Clearly audible!!
Now,they have moved on from the Air Tangent(for convenience reasons),sadly,and STILL use the Vibraplanes.

One additional point--They are both avid,fanatical LP collectors,having an incredible array of the finest records made.In classical,jazz,and pop.We are talking about guys who MUST have the "first pressings" of everthing.The lucky dogs!!
I hate them both-:)

Best!