floating room

[enodog]

Does anyone know if a resonance problem will be created in the 2-3" air gap between a basement wall comprised of 8" block walls covered in styrofoam insulation, 2x4 firring and sheet rock and a fully isolated/floating RSIC-1interior wall which will have 2 layers of sheet rock sealed with green glue etc..?

Also, if I wanted to wall mount side and surround speakers to the interior walls of a fully isolated RSIC-1 room and did not want to screw into studs and undermine the isolation of the walls what do i do? Should I simply green glue 1' x 1' x 3/4" plywood to the back side of the dual sheet rock layers (in between the studs) and then simply attach my speaker brackets to the plywood??

 

[bpape]

To avoid any resonance issues with ANY wall system, make sure the stud cavities are insulated with fiberglass, cotton, or mineral wool. Styrofoam against the wall is OK from a heat transfer perspective but does zero for acoustical value and cavity damping.

If you're going to mount surround speakers, it's best to either:

- place another hat channel track where you need to attach them.

- use an attachment method that does not go into a stud but rather is just supported by drywall (not generally recommended unless you're doing multiples or the speakers are really small as the vibrations from the drivers can loosen/crack drywall).

Bryan