[fajimr]

As much as I would like to be able to buy Glenn's, Ethan's or other commercial products to get my room sounding better, I simply don't the the financial means at this point.  So i've decided to go the DIY route......I've been trying to get some OC 705-FRK and 703 here in Montreal.  The one source that I found does not have them in stock but the representative tells me that the Ottawa Fibre is the same.  I went to the Ottawa fibre site (http://www.ofigroup.com/products/can_products_density.htm) and did a little research.  Two products that seemed to me the most appropriate for bass and then first reflection:

For Bass Trap:  OFI 48 FSK - has a "three part foil/scrim/kraft vapour retarder facing") and is available in 1”,1.5”,2",3”,4” widths
Freq (HZ) 125 250 500 1000 2000 4000 NRC
1”...........0.15 0.71 0.70 0.89 0.65 0.39 0.75
2” ..........0.51 1.10 1.13 0.82 0.53 0.33 0.90
http://www.ofigroup.com/products/us_pdfs/fsk_english.pdf

For first reflection: OFI-40 (2.5 lb available in 1"-5" thickness)
Freq Sound Absorption Coefficients
(hz)(1”)  (2”)
80 0.03 0.09
100 0.03 0.11
125 0.05 0.21
160 0.08 0.44
200 0.13 0.59
250 0.25 0.79
315 0.36 1.04
400 0.52 1.17
500 0.66 1.21
630 0.81 1.22
800 0.91 1.19
1000 0.98 1.14
1250 1.00 1.13
1600 1.04 1.11
2000 1.04 1.09
2500 1.04 1.07
3150 1.04 1.07
4000 1.07 1.07
5000 1.07 1.08
6300 1.07 1.10

http://www.ofigroup.com/products/can_pdfs/can_ofi_40_rigid_fibre_board.pdf


Does anyone have any experience with these products?  Are their qualities similar to the OC products.  Thanks, as usual, in advance. 
jim

[fajimr]

oooops.   In rereading Ethan's acoustics primer, I noticed that he referred to Ottawa Fibre as a company making similar products to OC.    

I'd still be interested in any comments on the products I have selected and/or experiences with Ottawa Fibre.

[fajimr]

Just to follow-up on my own thread here.. fyi.   I just talked with a represetative from insulation store and they told me the Ottawa Fibre equivalents to Owens Corning were:

OC 705----> OFI-72.  There is no FSK option here and I would need to double up a 2" piece to make a 4" piece.  I did note that in Ethan's primer, he suggested using the FSK backing towards the sound when used in a corner bass trap application. 

Freq Sound Absorption Coefficients
(hz) (1”) (2”)
80 0.07 0.02
100 0.02 0.24
125 0.06 0.32
160 0.12 0.50
200 0.17 0.71
250 0.31 0.95
315 0.43 1.08
400 0.60 1.14
500 0.75 1.19
630 0.86 1.18
800 0.97 1.15
1000 1.03 1.11
1250 1.06 1.07
1600 1.08 1.05
2000 1.07 1.04
2500 1.05 1.01
3150 1.07 1.02
4000 1.06 1.02
5000 1.05 1.00
6300 1.07 1.01

For the OC 703, he suggest that the Ottawa Fibre 048 was the closest

Freq Sound Absorption Coefficients
(hz)(1”) (2”) (3”)  (4”)
80 0.03 0.13 0.23 0.55
100 0.03 0.19 0.29 0.69
125 0.05 0.21 0.42 0.92
160 0.08 0.33 0.78 1.17
200 0.13 0.50 1.02 1.24
250 0.25 0.76 1.21 1.24
315 0.36 0.94 1.29 1.23
400 0.52 1.10 1.30 1.22
500 0.66 1.16 1.27 1.19
630 0.81 1.17 1.20 1.16
800 0.91 1.17 1.15 1.13
1000 0.98 1.15 1.14 1.10
1250 1.00 1.12 1.10 1.11
1600 1.04 1.11 1.10 1.11
2000 1.04 1.09 1.09 1.09
2500 1.04 1.06 1.06 1.06
3150 1.04 1.09 1.07 1.06
4000 1.07 1.09 1.07 1.06
5000 1.07 1.11 1.08 1.06
6300 1.07 1.06 1.09 1.08


any comments on my options?

[bpape]

Depends on what the room needs.  For bass control, for the money, consider putting together some 6" thick panels from an equivalent to 3lb/cu ft (703) material.  If you want to put an FSK face on it you can - again - depends on the balance and what you need.

Bryan

[Glenn K]

>As much as I would like to be able to buy Glenn's, Ethan's or other commercial products to get my room sounding better, I simply don't the the financial means at this point.<

You know just for fun you should send me a layout of your room and let me quote it. Heck if nothing else you would be free room advise..


Glenn

[fajimr]

thanks Bryan and Glenn

I'll contact you on the room size glenn and see what you can come up with- I'd appreciate it!

jim