Hocks Hearing Healthcare Products
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 800-654-6257
customer
Custom Noise Braker Test Data
Custom Noise Braker® hearing protection has been tested by Michael & Associates in accordance with The American National Standards Institute (ANSI), sound attenuation evaluation tested by Jack Vernon, Ph.D. at the University of Oregon Health Sciences Center, and CE tested by Sport Critt Loisirs.
Our proprietary Hocks Noise Braker® filter is used in other products, and while attenuation data should be similar, the test data on this site is for Hocks Noise Braker® units only.
Custom Noise Braker®
Reproduction of
Sound Attenuation Data Evaluation
from Jack Vernon, Ph.D.
Sport Critt Loisirs
The following 
test was performed by Sport Critt Loisirs.
Frequency in Hertz | 63 | 125 | 250 | 500 | 1000 | 2000 | 4000 | 8000 |
Mean Attenuation | 25.5 | 26.8 | 24.9 | 25.4 | 25.6 | 34.4 | 38.0 | 40.2 |
Standard Deviation | 5.9 | 4.5 | 4.3 | 4.8 | 5.2 | 4.5 | 5.6 | 6.0 |
Assumed Protection | 19.6 | 22.2 | 20.6 | 20.5 | 20.4 | 29.9 | 32.4 | 34.2 |
| Minimum Requirement | 0 | 5 | 8 | 10 | 12 | 12 | 12 | 12 |
Average High Frequency Attenuation | 28.0 |
Average Medium Frequency Attenuation | 22.1 |
Average Low Frequency Attenuation | 21.3 |
| SNR | 26.2 |
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Michael & Associates, Inc.
The following test results are from a US type inspection, conducted in State College, 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 | 9.7 | 13.1 | 22.9 | 30.0 | 34.4 | 43.4 | 41.1 | 32.8 | 32.7 |
Standard Deviation | 1.8 | 1.7 | 2.7 | 2.1 | 1.8 | 2.1 | 2.4 | 3.1 | 2.5 |
Assumed protection | 7.9 | 11.4 | 20.2 | 27.9 | 32.6 | 41.3 | 38.7 | 29.7 | 30.2 |
NRR 19
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3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 800-654-6257
customer
