John Sayers' Recording Studio Design Forum Archive

Most of the local contactors i've contacted in search for 703 don't carry OC products. They do carry Manville products though.

I've spent some time on their site finding out what the best material to use is.

They have semi-rigid (microlite) and fully rigid (spinglass). Each product comes in different density from 2 to 6 pcf.

Is a higher pcf always better for accoustics?
Semi Rigid, or fully rigid....witch one? How do they behave differently?

My Use:

Corner Bass Traps
Absorbtion pannels for the back wall of the control room (to kill early reflections)

-Chris Parsons

I'd go with the spinglass product. It's identical to the insulco I use here in Australia and has great figures and better than 703 IMO. The higher the density the better for the use you will put it to.

cheers
John

Hey John, I had thought (or been told somewhere, I forget) that higher pcf was better up to a point, but getting too heavy would make it reflect more in the highs if the sound was at an incidental angle (as opposed to coming straight at the insulation). This is the 10 or 12 pcf stuff I'm talking about- I have a bunch of stuff that is much heavier than the 'regular' 703 I have bought since.

Anyway, let me know if I'm wrong...

Kase
www.minemusic.net

Sure Kase - that's correct but we are only talking about 6 pcf here.

cheers
john