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In Reply to: RE: Gatorboard / Gatorfoam Revisited posted by Jim Hodgson on February 27, 2017 at 08:22:30
In my experience, combining two or more thick compliant (squishy) footers or pads in a stack can be counterproductive. A very compliant decoupling footer or pad should have a rigid surface to work against. If a thick compliant footer like the Big Tall Tenderfoot is placed under the maple platform, it might not complement the function of the compliant turntable suspension. In fact, the Big Tall Tenderfoot is suggested to replace stock suspension springs rather than augment their function.
I would suggest using a tall set of rigid metal cones or spikes if you need clearance below the maple turntable platform. You should also use a coupling disc under the tip of the cone or spike rather than simply allow the tip to dig into the wooden surface, which is not a very good way to couple a cone or spike to a relatively soft wooden rack shelf surface. The 40mm x 10mm Carbon Fiber Disc can also function as a very effective coupling disc by using the indentation on the one side of it to position the cone tip into, and will also add 10mm of height, as well as a couple of millimeters due to the thin anti-skid pad adhered under it.
Thanks, Duster! I think I get it: even one additional squishy layer is likely not to play well with my turntable's suspension; instead, you recommend that the suspension be the only compliant "layer" -- with everything else being rigid.
Would Herbie's "Hi-End Booster Bases," used in conjunction with the Grungebuster Dots (which I think you originally recommended), be an improvement over the Tenderfeet?
To your immediate suggestion, metal cones or spikes are certainly doable -- although that's not something I use and have around. If I were to start with what I have on hand, I could try either the old Polycrystal cones (lots of those around) or a set of Finite Elemente Ceraballs, which I'm thinking might conform to your suggestion:
Despite the employment of ball bearings, here, these devices don't shift horizontally like most bearings do. They're quite stationary. And as a result, I believe that they act very much like cones or spikes, with their functionality being almost entirely in the vertical coupling realm:
The CERA technology is based on direct coupling for effective transfer of sound interfering resonance. Fast resonance transfer is provided by extreme hard high-tech ceramic balls. Combined with precision machined materials like stainless steel or aluminum the optimum balance between damping and deflection is achieved. The resulting vacuum effect draws off unwanted resonance directly where it evolves.
Hmmm ... yea or nay? Could these be used alone, or should they be matched up -- top or bottom or both -- with the carbon fiber discs?
You know, it strikes me that, by adding this extra platform, I really don't stand to gain anything beneficial, and I've probably laid some traps for myself. Would shifting gears and looking for a way to raise the turntable, on its own, high enough to clear the top-shelf obstructions -- while directly coupling it to that same top shelf -- be the preferred approach?
This has gotten a bit too thorny for my limited insight/knowledge. Please know how much I appreciate the expertise!
You should be good to go, since either the Polycrystal cone or the ceraball Universal footer should perform well for the purpose. I would adhere a 40mm x 10mm Carbon fiber disc under either device with Liquid Nails silicone adhesive, with a 40mm Herbie's Audio Lab Thin grungebuster Dot (black version, with optional adhesive backing) affixed to the bottom of the disc as an interface with the rack shelf surface. The slightly rounded tip of the Polycrystal cone would be placed tip-side-up to make contact with the bottom of the turntable platform, with the carbon fiber disc acting as a base. The top of the ceraball Universal footer should also have an appropriately sized Herbie's Audio Lab Thin grungebuster Dot (black version, with optional adhesive backing) affixed to it to act as an interface with the bottom of the turntable platform, with the carbon fiber disc acting as a base. If I were to choose one vs. the other without comparing them, I would choose the ceraball Universal footer since the coupling function and potential beneficial vibration control may be better optimized for the purpose.
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