noisewreck
New member
Am I reading this right?
From http://www.bobgolds.com/AbsorptionCoefficients.htm
Product thickness density 125hz 250hz 500hz 1000hz 2000hz 4000hz NRC
RHT 60 4" (100mm) 4.4 pcf (70 kg/m3) 0.92 1.04 1.07 1.07 1.07 1.08 1.05
703, plain 4" (102mm) 3.0 pcf (48 kg/m3) 0.84 1.24 1.24 1.08 1.00 0.97 1.15
703, FRK 4" (102mm) 3.0 pcf (48 kg/m3) 0.88 0.90 0.84 0.71 0.49 0.23
Judging from the above, it seems that the Roxul RHT 60 is slightly more effective in lower frequencies (well at least at 125Hz, I wish they'd provide details for sub-bass... in the 40-80Hz region), and more importantly, more evently absorbent at higher frequencies, while the plain OC 703 seems to have more uneven distribution of absorbtion across the frequency range.
Wouldn't this make the RHT 60 a better material for acoustic treatment? And considering that it's also cheaper, I'd say it's a win-win.
Am I missing something? Is there anything about the OC 703 that would make it a preferable product?
As an aside... does anyone know how effective superchunks are in the sub 100Hz range? My room resonates like crazy around 41-43Hz and around 82Hz (see a pattern?). If I wanted to make a resonator type trap to specifically target this frequency, what would I need to do?
From http://www.bobgolds.com/AbsorptionCoefficients.htm
Product thickness density 125hz 250hz 500hz 1000hz 2000hz 4000hz NRC
RHT 60 4" (100mm) 4.4 pcf (70 kg/m3) 0.92 1.04 1.07 1.07 1.07 1.08 1.05
703, plain 4" (102mm) 3.0 pcf (48 kg/m3) 0.84 1.24 1.24 1.08 1.00 0.97 1.15
703, FRK 4" (102mm) 3.0 pcf (48 kg/m3) 0.88 0.90 0.84 0.71 0.49 0.23
Judging from the above, it seems that the Roxul RHT 60 is slightly more effective in lower frequencies (well at least at 125Hz, I wish they'd provide details for sub-bass... in the 40-80Hz region), and more importantly, more evently absorbent at higher frequencies, while the plain OC 703 seems to have more uneven distribution of absorbtion across the frequency range.
Wouldn't this make the RHT 60 a better material for acoustic treatment? And considering that it's also cheaper, I'd say it's a win-win.
Am I missing something? Is there anything about the OC 703 that would make it a preferable product?
As an aside... does anyone know how effective superchunks are in the sub 100Hz range? My room resonates like crazy around 41-43Hz and around 82Hz (see a pattern?). If I wanted to make a resonator type trap to specifically target this frequency, what would I need to do?
