My rack offers similar challenges. I made an isolation platform that goes between my dac and transport. Double thickness of mdf with a layer of thin rubber between the two layers (roofing membrane.) The two layers of mdf are screwed together to compress the membrane. Then I glued a sheet of 16 gauge copper plate to the underside of the platform for rfi/electromagnetic shielding. This is supported with 4 of the Parts Connection's small rubber feet. You can bullnose route the edges or install a wooden molding to make it look presentable. I then support the dac with Black Diamond Racing cones on top of the platform. Works great for not many $$.
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