I use an old tig weld table. It was actually used to weld afterburners for fighter jets. Solid steel 1/2" plate. Rigid is an understatement. Because as everyone knows, steel can cause resonance issues, I've "coated" the top & bottom of the steel plate with soundcoat adhesive sheets. I've also done this to the inside of the legs. I modified the weld table by placing two 1/2" thick bars (also soundcoated) from the top plate to the bottom and have my 2 piece preamp rack mounted to that. Everything (except the rack mounted preamp but including the weld table itself) sits on footers with ceramic balls in them. The music is very clear (at most any volume) and the sound-stage is deep, wide, with very well placed instruments in it. I couldn't say that before I did this. The only improvement I've made on par with this that made as big a difference, is replacing the power cords.
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