John Sayers' Recording Studio Design Forum Archive

So....if a substitute material had similar mass and size it should be ok? What do you think?

I don't why not Bill

cheers
john

John, pardon me but I LIKE the smell of long-dead horses being flogged -

Are you saying that because hangers are not rigidly mounted, that it's not necessary for the CORE of the hanger to also be absorbent? I would have thought otherwise, but you've built/used them... Steve

Anyone know where I can get absorbtion coefficients of Owens Corning Foamular 150 2" Rigid Foam Board???

Especially the Low, low mid figures


Bryan Giles

Hello Brian,

Do you have a link?

If this is hard foam (closed or pseudo closed cells) than there is no absorption (isignificant).
However such boards can be used as membranes (panels). But than it depends entirely on how thos boards are used not the absorption property of the boards itself.
If you put something like that in a drywall, you DESTRUCT the acoustic properties of the drywall.

If soft open cell foam please provide link

Regards
Eric

http://www.owenscorning.com/around/insu ... amular.asp

I am trying to decide how or what materials (Inside the cavity) of the Slat rear and side walls.

I have decided to hold off till Firday to build this wall and finish a few other walls 1st (Waiting on my 16pair Bulk WIre to arrive)

Any help would be appreciated. Trying to be done by next Thursday.

I am doing a wall a day and have 4 to go.

My rear Resonator wall is 4'5" wide (each side. I posted a pic on another post) by 8'5" tall. John recommended not slating the whole wall, I am waiting till daylight in Aussie town for his followup. SO between you two guys I can figure out which way I shall go.

Thanks in advance Erik.

Bryan

Hello brian,

I don't find directly technical info but:

This is clearly NOT the material to use.
As described in previous message. This is closed cell hard foam, probably polyurethane foam.
No use in acoustics.

Absorption.
Think fiberglass, rock wool or comparable.
Types: Don't know which ones you have over there.
John or others will advise you.
But you should find that in the forum somewhere.

Regards
Eric

Thanks for your help eric. I was just making sure.

I will go ahead and use the Fibrex SAFB I found for these walls.

God Bless.

Bryan Giles