Acoustic Specs

Sorber NRC Ratings:

The Noise Reduction Coefficient (NRC) is a single-number index determined in a lab test and used for rating how absorptive a particular material is. This industry standard ranges from zero (perfectly reflective) to 1 (perfectly absorptive). It is simply the average of the mid-frequency sound absorption coefficients (250, 500, 1000 and 2000 Hertz) rounded to the nearest 5%.

Based on the testing methodology, and depending upon the material's shape or surface area, some products can test at an NRC above 1.

NRC Rating at each frequency:	125Hz	250Hz	500Hz	1000Hz	2000Hz	4000Hz	Overall NRC Rating
Sorber 1.5" (38mm) thick	.29	.60	1.11	1.12	1.10	1.07	1.00
Competitors 2" StudioFoam	.11	.30	.91	1.05	.99	1.00	.80
Generic 2" Acoustic Foam	.19	.22	.45	.55	.60	.76	.45

1/4" Acrylic dB Reduction:

Frequency:	100Hz	1000Hz	10K
dB Reduction:	-7 dB	-13dB	-28dB