Vibraplane: Should it be loaded close to limit?

AVphile,
The Kinetics website quotes a max load of 200, but the specification sheet for the unit quotes a max of 275. The performance graphs suggest the closer to the max load the better the isolation figures. I have emails going to both Sounds of Silence and to Kinetic Systems for some suggestions. I just thought Audiogon members who own this unit might have some insight on how to optimize its performance.

I too recently picked up this unit (active version with compressor - 2212-01), and would also like to know the answer to this question. The instruction manual states 275 lbs as the maximum load.

Pete, please post for us what you hear back.
Regards & Thanks.

I did hear back from Kinetic Systems and from Sounds of Silence. Tony at KS suggested I contact Steve Klein at SOS as he has more experience with the VP in audio applications. The maximum net design load of my passive 24" X 20" Vibraplane 2210 is indeed 275 lbs. Steve wrote me that there will be audible improvements when pre-loading the unit in the 125-150 lb. range and then diminishing improvements from that point on.

Neither gentleman recommended one type of slab over another but Steve did mention that a critical decision would be what material to use between the slab and the top of the VP. He recommended researching materials from EAR.

My VP arrived today and I think I will start by just setting it up as is and comparing it to my Townshend Seismic Sink. I may end up moving my TSS under my phono amp as I have another one under my pre amp and it did improve the sound. After I live with the VP under my TT for a while, I will experiment with pre-loading it. The unit weights about 150 lbs, so if I add another 150 lbs plus my 30 lb TT, that will be a lot of weight on the top of my rack.

Thanks for all the feedback and if anyone has anything else to add, I would appreciate it.

Great info thanks