Absorbers - how far off wall / ceiling

Hi all I'm sure this has been asked a million times but my search has come up empty so... Is there a way to determine the relationship between frequencies absorbed and distance (2'X4' 703) panels are hung/suspended from walls/ceilings? Thanks in advance Don

I read somewhere on this forum or the one at homerecording.com that it's a good idea to space the panel away from the wall or ceiling the same distance as the panel is thick. So, a panel that's 3" thick would be placed 3" from the wall/ceiling for good broadband absorption. Targeting specific frequencies is more likely a job for a slot resonator. I'm not sure. Somebody who knows the science of it all will hopefully chime in so, you and I both can know some more on the subject. Dude

Dude, > I read somewhere on this forum or the one at homerecording.com that it's a good idea to space the panel away from the wall or ceiling the same distance as the panel is thick. < Yes, and that's originally from my Acoustics FAQ: www.ethanwiner.com/acoustics.html Click Optimizing the Air Gap in the Table of Contents to jump to that section. --Ethan

That's what I was looking for, just couldn't remember where I saw it. Thanks Ethan Don