Helmholtz Query

Rick Hollis · Post by **Rick Hollis** » Wed Sep 17, 2003 9:59 pm

Quick Question for ya's.
Do the slats on a Helmhotz resonater actually touch the insulation behind the fabric or do they resonate freely? I'm building some into the rear corners of my control room much like the Egan sound control room on your website. I've lined the inside of my cavities with 4 inch rockwool behind acoustic hangers. The rockwool is not touching the slats and the slats produce audible resonances (about 150- 400hz) when tapped like a low pitch xylophone. Is this normal?

giles117 · Post by **giles117** » Wed Sep 17, 2003 10:07 pm

Yes that is normal.

Having the material touch the back of the slats creates a damping effect for even better absorption.

Bryan Giles

Rick Hollis · Post by **Rick Hollis** » Sun Sep 21, 2003 11:31 pm

Thanks mate , much appreciated!