Springs for homemade isolation stand

not sure if this is what your looking for;Grainger Industrial supply,Mounts and vibration control,

Dgad, why would you want to do this? I can see where you might think this will help isolate your equipment from floor-borne vibrations.

But if you do this what do you suppose will happen to the air-borne vibrations and internally-generated resonance already captured by and now inside your components?

More importantly, which of these three sources of vibrations and resonance induce the most sonic havoc?

BTW, nice system and room.

-IMO

Hmm, sounds like a very tough engineering problem to me.

I wonder though why would you need to go to such lengths of isolation? Are you playing music at earth shattering levels that require such drastic measures? or am I missing something with your particular set-up, and am perhaps having a hard time visualizing what you wish to do?

They claim all components can benefit from isolation, but particularly a Turntable.

I have some doubt, or perhaps I should ay wonder again, if a physical spring-springs will benefit your situation, or maybe more likely be a detriment?

It sounds like a lot of weight to suspend, and there certainly would be more cost efficient ways to isolate some of the components. Some suspend Turntables from wall mounted brackets, and another method may be removing the entire system from the sound room all together, with the exception of the speakers?

One crazy thought came to mind about suspension, as I was thinking about my Chevy SUV, which has custom fitted Firestone Ride-rite Air Bags at the rear.

VPI used actual small Firestone Air Bags on their one TNT Turntable, but I am unaware of further custom sizes in these type of units that would be perhaps suitable for your personal application?

If they were made, a Air Suspension Bag could be fine tuned perhaps to accomodate odd, unbalanced loads, or a number of them could be mated together via air lines to provide balance-leveling.

Crazy thoughts, I know, but some words I can recall about Harry Weisfield from VPI once saying (perhaps in jest) how the perfect Turntable would weigh 500lbs, be made from concrete, and float on a bed of air.

Hoping some others can give you some better sound advice than I have, Mark

Rather than spend for an islation rack for $2000 or more $ I would like to use some springs to suspend the top shelf of my rack. If I knock lightly on the rack the feedback goes through to the turntable. I can use isalation feet but have a feeling springs will be less expensive & more effective. Some of the most effective isolation platforms in use utilize springs in compression between two boards. I am hoping to attain something as such.

"If I knock lightly" - the best way to eliminate this feedback is don't knock at all! :-)

You are creating a condition that does not exist under normal user circumstances. Most of the acoustic problems from vibrations come from airborne vibrations which are not simulated by knocking, or airborne vibrations transmitted thru the floor which again are not simulated by knocking.

I'm not sure what type of TT you are using, but I have found the best isolation for both spring and unsuspended TT's to be a solid platform of materiel with little likelyhood of resonating in the higher frequencies, placed over soft materiel, like sorbothane. You can make a sandwich if you like. Supports with air bladders instead of sorbothane materiel can work quite well also.