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 |