garage fit-out - floating metal frame?

[rick]

my advice is dont go hebel unless you want to !

or make sure you fill them all with sand .
the main issue is the damn things are so uniform that they resonate all at the same frequency which of course would depend on the size room
but in the room i had them used in had a shitty 400htz ring to it that i could never get rid of it was the resonant freq of the room with my hebal walls you could just "tap the walls anywhere and hear it !.

what you want to do is mixup the thickness and or materials of the the structure so it doesnt end up with a "resonate"note or a "hole" for that matter
which is why you use different thicknesses of gyprock or glass or whatever

or fill em with sand .. job done

[rob]

ok...first up i'm not an acoustician, so my comments could well be worthless.
However i've been in a room with Hebel walls and it sounded very ringy. It seems instructive to tap a hebel block with a drum stick...it has a "note" that is pitched quite high...compared to say a block of wood.

But I could be talking out my arse.

I would also seem that given it's affordability and ease to work with, if it was a great acoustic material, everyone would be using it. Are they?