[ecramer]

Will this work for bass traps on lue of OC 703 My friend wants to build a couple of bass traps and access to this for $60 a 4' x 10' sheets

http://www.industrialinsulation.com/images/duct_board_oc.pdf

125 250 500 1000 2000 4000 NRC
Acoustical Performance Sound absorption coefficients at octave band center frequencies, Hz.
                                 125     250   500  1000 2000 4000  NRC
Type 475, 1" (25mm)     0.08    0.19  0.69  0.94 0.99  0.98  0.70
Type 800, 1" (25mm)     0.08    0.19  0.69  0.94 0.99  0.98  0.70
Type 800, 11/2" (38mm) 0.12   0.33   0.92  1.04 1.03  1.02  0.85
Type 1400, 2" (51mm)    0.14   0.72   1.15  1.12 1.06  1.07  1.00
These data were collected using a limited sample size and are not absolute values. Therefore, reasonable tolerances must be
applied. Tests were conducted in accordance with ASTM C 423, Mounting A (material placed against a solid backing).


ED
Sound absorption coefficients at octave band center frequencies, Hz.

[bpape]

If he's going to stay with a flat mount or even straddle a corner, he'll need to at least do double thicknesses to get 4" or you won't get much bass control.  The material itself is pretty similar to OC703.

Bryan

[ecramer]

Hello Bryan

Still have to call SPI and get a price on oc 703 /705 to see what is cheaper the duct board i can get local at hvac supply company in town spi is a 50mile one way trip not that i care that much. I planed on cutting 2x4' panels out of the material and building 4"thick traps with a space behind. I would like to get at least 4 traps in his room two on the back wall and 2 behind his speakers

ED

If he's going to stay with a flat mount or even straddle a corner, he'll need to at least do double thicknesses to get 4" or you won't get much bass control.  The material itself is pretty similar to OC703.

Bryan

[bpape]

Stick with the 703 or the duct board.  You can buy 6" of 703 cheaper than 4" of 705 and it will perform better.

Bryan

[Rob Babcock]

Does he have a local source of is he ordering it online?

[ecramer]

Does he have a local source of is he ordering it online?

Hello Rob

I can pick up the duct board local The oc 703 i would have to get from here

http://www.spi-co.com/

Wilkes-Barre, PA
2 Stevens Road
Wilkes-Barre, Pennsylvania 18702
570-829-6525
570-829-6528 FAX
wilkesbarre@spi-co.com

drive about 90 miles round trip to pick up or have it shipped.