Hocks Hearing Healthcare Products
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 800-654-6257
customer
Standard Noise Braker Test Data
Standard Noise Braker® Frequency Test
The following test data was made on our Standard Noise Braker® plug.
The tests measured noise attenuation (reduction) at varying frequencies. Testing the frequencies is similar to comparing the noise reduction while you play the key of C at varying locations on a piano keyboard.
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.
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 |
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
Noise Braker® Standards are mass produced ear tips with the Noise Braker® filter inserted in the body.
The soft accordion style tip has three flanges that seal the ear from sound and keep the plug in the ear, leaving only one way for sound to enter the ear - through the Noise Braker® filter, thus allowing the filter to do it's job.
The effectiveness of Noise Braker® Standards depends on how well the ear is sealed. This can change depending on the size and shape of a person's ear. Because the Standards are mass produced, they are lower in cost than Custom Noise Brakers®.
3930 SW Kelly Avenue
Portland, OR 97239
ph: 503-274-9482
fax: 503-222-3539
alt: 800-654-6257
customer
