Further to the speaker room interface I wonder if my room, being an Art Noxon design intended to be sound isolating (i.e with bass traps and damping built into the walls) may be less conducive to a SS type "grounding" arrangement in so far as the excess energy has no easy path to ground and hence causes problems in the room.That is an interesting question. What does Art use for dampening again? My hunch is it would work just fine as demonstrated by the video of an 18 inch sub fed 1400 watts and spitting out 104dB. I know people who use Sistrum racking with rooms like yours. That would be a question for Robert.
My room is a hybrid design in that sense. I have greenglue sandwiches of drywall floating on an isolation clip system engineered by Cascade Audio on the external walls and ceiling along with spray foam insulation for noise reduction purposes. Corners and waveguide elements use sand and/or foam insulation. The internal walls use the SS constructs only.