Turntable isolation platform Recommendations?

Check out this video. https://www.youtube.com/watch?v=1rgK0YMsJXM

Wow, a lot of interesting mythology here.

Iconicaudio, This is a very simple problem from the perspective of a turntable. You need to keep all vibration higher than 3 Hz from getting to the record and cartridge. That requires a mechanical filter tuned to less than 3 Hz which requires knowing the exact weight of your turntable. Check out the MinusK web site and look what it takes to order one. Minusk makes the best isolation platforms in the world today. They started making them only for scientific equipment then they realized they were missing out on a huge market, audiophiles. They are not cheap but this will give you an idea what it takes. If the web site doesn't ask you the exact weight of your turntable and have platforms broken up into 4 or 5 ranges then forget it, like Critical Mass which is nothing more than marketing BS. MinusK will also tell you what frequency the platform is tuned to given the weight of the turntable. There may be other less expensive and viable options on the market like the Townsend platform but I have never played with one. There are many poorly tuned or unstable turntable suspensions out there. 

As for cheap isolation platforms, the Townsend looks to be OK. It is a plate sitting on 4 damped springs. Because it is sitting on the springs and not hanging from them it will have a tendency to be unstable particularly with a heavy load as there is nothing to keep the springs from moving laterally. A hanging suspension will always bob straight up and down. This type has a tendency to bob all over the place. Just ask anyone who has owned a Linn.

@chakster ,in no way can you compare studio or commercial equipment with consumer Hi Fi. The environments are totally different. There is no bass under 50 Hz in FM broadcasting. As for mastering, at the point the master is sent to the lath there is no music in the room. If anyone is listening it will be via headphones. These lathes can be far from perfect. I have some records the rumble is intolerable, bad lathe. The lathes are big, very heavy and complicated devices. They are far from perfect.
In terms of high quality reproduction in residential situations it is difficult to argue against suspending a turntable. If done correctly the result is a far more stable device with a much lower "noise of all kinds" floor. Any user of a suspended Sota, SME or Basis turntable will wholeheartedly verify this. he AR XA was such a landmark because with a little clever thinking and design it handily out performed  all the commercial tables of the day.
So much so that others like Thorens and Linn  started copying it and idler wheel tables disappeared. Look at the current crop of ultra expensive turntables, the Basis Work of Art, the Air Force One, the Dohmann Helix.
All of them are suspended in some fashion. 

Keys, The Critical Mass platform is terrible. You can get a MinusK platform that will handle that weight but You won't like the price. The KSI platforms are also great but probably even more expensive. Critical Mass and Townsend make inexpensive, 1/2 baked stuff that no respectable lab would ever put an electron microscope on. A turntable's requirements are just as stringent. If a lab won't put an electron microscope on a certain platform you do not want to put your turntable on it. Cheap solutions are just cheap and frequently worse than no solution.

Had not heard of Stacore before. Interesting product and there is no reason it should not work. However, I think the MinusK solution is much better. It's negative stiffness springs do not require compressors or tubing and connections that eventually fail. The KSI platforms are excellent but still more complicated than MinusK platforms. 
An isolation platform will do absolutely nothing for an SME 30/2. It is itself an isolation platform. Other equipment on solid shelves should not require isolation platforms. All the "vibration" they are subject to is airborne and the only way to isolate from that is to put the equipment in another room. The money is much better spent on upgrading the equipment. This is just another example of lay instinct running away with itself. 

@whart , excellent set up whart! Why did you add the HRS platform? I assume you ordered the MinusK platform for the weight of the turntable? Or, was it the weight of the turntable plus the platform? Technically, you should not need the HRS platform at all. 
I assume you have a symmetrical situation for the left channel? Is the system on the short wall?
For those looking at whart's system just a small note. There is now a low profile MinusK platform that is only 3 inches or so thick which makes the set up much less bulky. whart now has the best of both worlds, mass and isolation but, notice that he got an isolation platform in spite of having an ultra high mass turntable.
Whart, have you thought of adding the air bearing base? You already have the compressor so, why not?

@lewm, Get a spring. Glue one end of the spring to a piece of plywood so that it is standing upright. Now, start adding mass until you get the resonance frequency down to 3 Hz. Hint, you will never get to 3 Hz. The whole affair will fall over long before you get there. Now hang a spring from anything handy. In IV pole would work great. Start adding mass until you get to 3 Hz. It will bounce at 3 Hz and come to a rest in exactly the same spot every time. Hanging a mass from a spring is far more stable than sitting a mass on a spring especially at low frequencies. This is basic spring science Lou. It is why a Sota will tolerate foot falls and an LP 12 will not. 

@whart , I know, setting up a turntable on a MinusK platform can be an adventure. You have to get the center of gravity right and in your situation you have to do it juggling the various pods. The other problem is that you have to be very deliberate when handling anything or you can get the whole affair bobbing. One of the main reasons I like the Sota over the SME and Basis turntables is the suspension is internalized so you can put your hand down on the table without getting it dancing or causing it to skip. Have you looked at the Dohmann Helix? That is my ultimate turntable for the time being. 

I got news from Donna yesterday. My Turntable is finally under construction. (after 9 months)

@whart , the bottom of the Kuzma components are flat metal? No feet or pads? Something to keep them from sliding? I know they are very heavy.
The MinusK is totally passive and the Kuzma is grounded. I see no problem in putting the Kuzma directly on it. But, I don't like unnecessary complexity. I can't think of a reason the additional platform would create any issues either as long as the table is at a reasonable height that you can use it comfortably. I like my table up higher around four feet. 

That kind of mass on a wall shelf can be bad news. Walls flex also actually, worse than floors because they are much thinner. Hang that kind of mass on a lever arm and you get a very springy affair. 
As whart implies, mass is not isolation when it comes to low frequencies.
It is a shame to have to put that beautiful table on an ugly MinusK platform. I would sink the MinusK into a cabinet so only the upper surface was visible. Anyway, this is life with turntables.
@whart , Look at the Schroder LT tonearm. Just a thought if you wanted to get rid of the compressor. If you are ever up in New England I'd be happy to demonstrate Sound Labs for you. But, judging from your room and taste in gear I'm not sure they are the speaker for you. 

@whart , forgot to put your label on the post above.

You obviously have had the experience. We tolerate the crap weather we get the rest of the year just for Autumn, the finest weather with technicolor. I live in Southern NH. My brother has a condo at Saddle Back mountain in Main. I drive a 911 C4S year round. Maine only has enough money to afford State Troupers on the major highways. There are thousands of miles of two lane back roads ( B roads) that are unprotected except for the local constabulary in the small towns. You just have to slow down when the speed limit drops before these towns. Other than that it is....open season:-) Catching air, lurid slides, big fun. Very little traffic. I use to autocross but it was taking up too much time and money. I stopped when the kids came along.