I was happy with my a la Mapleshade 4" maple block on cork/rubber pads, untill I decided to try (based on A-gon thread) aluminum top plate on sandbox. Bunch of transistor heat radiators are bolted to the bottom of 3/4" anodized aluminum plate and submerged into 30 kg box of sand - all unwanted vibration are completely sunken through the huge contact surface and died out naturally in the sand . The whole thing is supported by 6 big and thick sorbotane pucks - look at the sorbotane site how to calculate the optimal geometry of the sorbotane pads to minimize natural frequency of the whole assembly.
I got much jucier sound combined with ink-black background comparing with the maple platform - I guess I'm done with isolation platform.
I got much jucier sound combined with ink-black background comparing with the maple platform - I guess I'm done with isolation platform.