Rack Stack Vibration Isolation advice

Cork Pads are one of my go to separators and used as a tier in the Support for the Sub-plinth my Racks sit on.

Years ago Spent Squash Ball as a Half Ball were used as footers under equipment. I was always led to believe Spent Hockey Pucks were similar in their managing energy, these would be a good dimension as a Rack Footer.

Do consider for the Rack Support, a Sub-Plinth built on top of a few tiers of different separator materials.

IsoAcoustics Mini-Pucks and Oreas work well under my main electronic components. At the suggestion of a friend, I use little squares cut from Ikea Gunstig pot stands under my power amplifiers. These are cheap enough to try under all components. When cutting, care needs to be taken with the metal magnets in the Gunsigs. Multiple layers of these cut squares can be used.

I did see a photograph of a rack that had been fitted with IsoAcoustics Gaia loudspeaker feet. For racks that take threaded bolts, this looks like an elegant vibration control solution. I think they would work for my Quadraspire racks and I have trying this out on my to do list. 

Try some of these isolation pads. They have cork or a rubber compound in the center. They work and they are cheap

https://www.amazon.com/s?k=hvac+isolation+pads&crid=2NXFBWX69Q44R&sprefix=hvac+isolation+pa%2Caps%2C195&ref=nb_sb_ss_p13n-expert-pd-ops-ranker_1_17

you want that rack perfectly level, now, and forever, no matter what is placed where within, so I would not put anything that compresses below the main floor contact.

I bolted new end hardwood legs onto my rack, to get the fulcrum points in front of and behind the weight, tapered because the floor is slanted, shims for final leveling, I could have made them taller as you need.

It is hard to see, but each glass shelf is isolated from the bentwood frame below it on hard rubber spacers

the JVC Victor Plinth’s feet are isolators and adjustable for leveling it, however my wood floor is flexible, my final solution was rubber/cork below the TT’s feet, after they worked, I wrapped them in black tape.

there is a lot of weight, but because the rack is level, it doesn’t move like it used to.

rather than a wide rack, I like separately movable units, my preamp and amp unit has felt feet and slides easily enough, R2R tape is on a separate movable unit left end

and I made a stand/surround so I can move the bottom preamp without moving the heavier amp above

wide open back for access and ventilation

@whyrichard 

I have used very inexpensive Sorbothane hemispheres between two flat surfaces supporting a total load of about 70-kg or 150-lbs.  For that load I needed eight 50-mm hemispheres.  The calculation is not trivial but Sorbothane’s website has a very detailed Standard Product Guide at Sorbothane-SPG.pdf.  They are also very helpful if you email them.  Total cost was under A$100.

I also have IsoAccoustics OREA Bordeaux which are about that price each (ouch). I would not use IsoAccoustics loudspeaker isolators for a rack because they are designed to allow sideways movement but not back-and-forwards.