Space between panels or thicker panels?

[davode]

Which is more efficient to do, 2" thick panel mounted 2" away from the wall or 4" thick panel mounted flush on the wall? I've read that spacing a panel away from the wall makes it a better absorber than one that is just thicker, such as 1" panel spaced 1" away absorbs better than a 2" panel mounted flush. Is this true?

Thanks, Dave

[PaulP]

I believe the airspace let's you save on material but not on overall thickness.
You can increase the performance of a given panel by spacing it out from the
wall but I don't think that'll outperform the same overall thickness completely
filled with absorbent.

See (click on the little arrow to expand the view) :

Master Handbook of Acoustics - Google Books

Paul P

[Glenn Kuras]

Which is more efficient to do, 2" thick panel mounted 2" away from the wall or 4" thick panel mounted flush on the wall?

4" against the wall.

[davode]

Awsome!! 4" it is then!!

Thanks, Dave