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Minus k Technology BM-8 Isolation Platform

Just wondering if anyone out there is using one of these to isolate their turntable. It is a passive design using what the company calls negative stiffness isolators.  Very clever design. You really have to see a picture of the isolator    https://www.minusk.com/products/bm8-vibration-isolation-platforms-bench-tops-isolators.html
It looks to me given the specification that you could isolate any turntable with one of these as well if not better than SME, Basis and SOTA  do with their designs. It is not much to look at and at $3000 it is not exactly cheap but it would be a miracle for someone with foot fall and feed back problems. I personally think equipment racks are unattractive and will not have one in my living room. My equipment is hidden in an antique armoire. I'm thinking about replacing my old suspended turntable with a new one and this platform would give me a lot more flexibility and choice.  Just wondering if they really work👩‍🦳
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looscannon

Showing 2 responses by whart

whart's avatar
whart
3,128 posts
 
I have the BM-1, which was spec’d for a 250 lb load. I am in an old restored Victorian with springy wooden floors and the Minus K does work to effectively isolate the table- a Kuzma XL with an Airline am- from footfalls. Where I ran into problems was trying to add a second arm, with arm tower. I could not get it to center and fully isolate in all planes -- part of it was due to the fact that there were multiple heavy pieces to the turntable assembly at different distances from the center, but I suspect height of the mass factored in. Here’s where I was with it a year ago: [url]https://thevinylpress.com/app/uploads/2019/04/Kuzma2arms-sized.jpg[/url]
whart's avatar
whart
3,128 posts
 
Yep, had the HRS made shortly after I got the table- which is the original model, two AC motor job. The presence of the HRS does change how the Minus K sees the weight since it is distributed but man, I can't tell you how many hours I put into tearing down and setting that thing up. The folks at Minus K gave me a few suggestions for moving around the Sorbothane contact pads between the internal mechanism and the top plate, but it didn't really help. 
With just one arm tower, which itself weighs around 30 lbs, the whole thing works fine. So, I'm back to one arm for now on that table. 
I did buy the Minus K stand which is in some ways a bargain- welded steel, very sturdy, adjustable feet for leveling with a nicely finished phenolic top for under a grand. Good to see you @wrm57 !
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