Hocks Noise Brakers®
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 1-800-654-6257
contactu
Custom Noise Brakers
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
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 |
Site Links
Home
Noise Induced Hearing Loss
The Effects of Noise
Industrial Hearing Loss
Protect Your Hearing
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 1-800-654-6257
contactu
