In the Home Theatre, I used a box within a box construction, decouples the base. Used resilent channel on the the inner most drywall layer, with a layer of drywall and a layer soundboard behind it, with all having offsetting joints. Everything was insulated as well. Could play ~120 dbs in basement and barely could hear it on the main floor.
I not sure if the same construction has any merit with what you are trying to do with a sound room, no experience there.
Rumour has it that Thor uses a similar setup in his basement....
Last edited by cupofjoe; 01-29-2020 at 12:08 AM.
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