Hocks Noise Brakers®
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 1-800-654-6257
contactu
Noise Braker® Standards
Sport Critt Loisirs
The following 
test was performed and provided by Sport Critt Loisirs.
Frequency in Hertz | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
|
Mean Attenuation | 7.6 | 7.2 | 11.0 | 14.9 | 18.7 | 25.5 | 31.5 | 30.9 |
|
Standard Deviation | 2.9 | 2.2 | 3.0 | 4.7 | 6.6 | 6.5 | 7.6 | 5.7 |
|
Assumed protection | 4.7 | 5.1 | 8.0 | 10.2 | 12.1 | 19.0 | 23.9 | 25.1 |
|
| Minimum 0 5 8 10 12 12 12 12 Requirement | |||||||||
Average High Frequency Attenuation | 18.9 |
Average Medium Frequency Attenuation | 12.7 |
Average Low Frequency Attenuation | 9.6 |
SNR  | 16.4 |
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Michael & Associates, Inc.
The following test results are from a US type inspection, conducted in Pennsylvania by Michael & Associates, Inc. The testing took place from August 9 to August 12, 2008.
Testing was performed in accordance with The American National Standards Institute (ANSI). A copy of the full report is available upon request. All numbers (unless otherwise noted) are in decibels (dB).
| Frequency in Hertz | 125 | 250 | 500 | 1000 | 2000 | 3150 | 4000 | 6300 | 8000 |
Mean Attenuation | 13.5 | 15.3 | 18.1 | 22.8 | 29.3 | 34.0 | 33.4 | 31.7 | 35.6 |
Standard Deviation | 3.9 | 3.3 | 3.3 | 3.8 | 4.5 | 4.7 | 4.6 | 3.3 | 4.2 |
Assumed protection | 9.6 | 12.0 | 14.8 | 19.0 | 24.8 | 29.3 | 28.8 | 28.4 | 31.4 |
| NRR 15 | |||||||||
|
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 1-800-654-6257
contactu
