Floating floors and walls

[sap]

I am going to build a room within a room. I will use the double stud wall and a floating floor design. My question is should I build the wall on top of the floating floor or on the existing floor which is concrete?

[knightfly]

Most effective isolation is to rest inner wall frame on floated floor, then support inner ceiling leaf with separate joists resting on the inner walls; be wary of proper calculations, damping, mass, etc, though; otherwise you might end up with LESS isolation at some frequencies... STeve

[sap]

If I just build the room with insulation in between walls, how much sound isolation can I expect. I am going to record high gain guitar amps in the room and also record vocals. When I record the amps I want to cut the volume down in the control room.

[knightfly]

Too general a question; you'd need to post a sketch with exact materials, distances, type of framing, etc, before I could even GUESS... Steve