I bought some Roxul mineral wool>

[girvan]

Hi Folks,
Bought some mineral wool, Roxul Plus - It's 48"x32"x4" (6 pieces cost me $50 CAN)
Here are the specs for 3.5", do you think its OK? (Don't have the 4" specs posted anywhere to find)
125 Hz - 0.56
250 Hz - 0.99
500 Hz - 1.17
1000 Hz - 1.04
2000 Hz - 1.05
4000 Hz - 1.05
NRC - 1.05

From what I gather the closer to 1.0 the better at the given freqency. Correct me if I'm wrong but this stuff should make a decent DIY trap.
Thanks
Scott.

 

[studiomaster]

Is it rigid?

 

[girvan]

Semi rigid. It's 2PCF - I know 3 or higher is better. I need to special order Roxul Safe N Sound - It's denser. I think this stuff will be OK - not the best, but a start.

 

[scrubs]

Is it rigid?

Semi rigid.

What is this, the Mark Foley forum?

The Roxul should work ok. You may want to double up the thickness in the corners for added bass absorption.

 

[studiomaster]

How does the Roxul packing look like? Is it really bulky? Cause I'm thinking of getting one pack of those from Home depot...

 

[girvan]

Bulky, yeah. Figure 6 pieces 4" thick - 24" right. It's wrapped in heavy gauge plastic.

 

[studiomaster]

Yup...I guess that's the one.

They're about $40 at my local Home depot...i don't know what sort of wood to buy..

 

[scrubs]

Yup...I guess that's the one.

They're about $40 at my local Home depot...i don't know what sort of wood to buy..

Depends on how you want to make the panels. For panels that will be permanently mounted to the walls, you can use a plywood back and just cover them in fabric and/or put a wood frame around them.

I'm currently building some with just wood frames and an open back (fabric-covered) so they can be mobile and will absorb sound from both sides if placed a little bit out from the wall. You can get 1"x4"x8' pine boards at home depot or lowes for about $2 a board for the frames.

Alternately, the mineral wool is probably sturdy enough that you could just cover it in burlap and wouldn't need a frame. As long as it's fully covered, it shouldn't flake apart.

 

[studiomaster]

Does those Roxul pink insulation stuff work? They have these mini packs costing $6/pack. I think the size is perfect enough for a broadband absorber. For a bass trap..i guess, I need 2 packs.

 

[scrubs]

Does those Roxul pink insulation stuff work? They have these mini packs costing $6/pack. I think the size is perfect enough for a broadband absorber. For a bass trap..i guess, I need 2 packs.

Do you have a link to the exact product? I didn't see any "pink stuff" on the Roxul site. The info sheets for most of their products do show sound absorption numbers, though. For broadband, you want absorption close to 1.00 across the spectrum.

As I understand it, the keys to these absorbers are the thickness and density of the material. Fluffy pink insulation will control high frequency flutter, but it is not dense enough to stop bass or even low-mids, which are the major problem areas in most home studios. That's why condensed fiberglass and mineral wool/rock wool are more often used. The Owens Corning 703 is about 6 pounds per cubic foot. Mineral wool comes in varying densities from 4 to 12 pounds/cubic ft.