Hi,

I have a dedicated listening room being built in my new house.

The outer walls are concrete block with pour concrete centers and the 4"x2" framing is not attached to the concrete wall. There is a 1" gap between each thus giving me a 5" catvity to stuff with mineral wool.

My question is: Should I use 4" deep mineral wool (therefore leaving a 1" air gap) or use say 2" mineral wool giving me a much larger air gap and maybe increasing absorbtion.

Any help apprecicated.

Thanks,

Peter