Acoustical Performance Data

Octave Band Center Frequency, Hz	125	250	500	1K	2K	4K	STC	RAL Test #
Sound Absorption Coefficient
NB-II 2" Thick	0.26	0.53	1.00	1.03	0.97	1.02	0.90	A03-194
NB-II-B Bagged	0.35	0.63	1.08	1.12	0.94	0.77	0.95	A03-193
NB-IV 4" Thick	0.70	1.08	1.15	1.05	1.05	1.01	1.10	A03-192
NB-IV-B Bagged	0.78	1.10	1.19	1.04	1.02	0.81	1.10	A03-191
NB-II-V 2½" Thick	0.46	0.86	1.36	1.20	1.03	0.83	1.10	A04-056
All tests Conducted at Riverbank Acoustical Laboratories. Sound Absorption Coefficients by the Reverberation Room Method ASTM C-423-02.