Standard Noise Braker® Frequency Test
The following test data was made by two different companies on our Standard Noise Braker® plug. The tests measured noise attenuation (reduction) at different frequencies.
(It is similar to seeing how much noise reduction took place while you played C at different spots on a piano.) 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.
Inspec International Ltd.
The following test results are from an EU type inspection, conducted in the United Kingdom by Inspec International Ltd.. The testing took place from May 28 to June 15, 2008. Testing was performed in accordance with EN 352-2 : 2002. 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 |
6.7 |
10.4 |
14.3 |
22.3 |
29.3 |
no data* |
36.0 |
no data |
35.6 |
| Standard Deviation |
2.5 |
2.8 |
2.7 |
3.1 |
3.5 |
no data |
4.0 |
no data |
4.2 |
| Assumed protection |
4.2 |
7.6 |
11.6 |
19.2 |
25.8 |
no data |
32.0 |
no data |
31.4 |
| *Some frequencies were not tested by both companies. |
| Average High Frequency Attenuation |
25 |
| Average Medium Frequency Attenuation |
16 |
| Average Low Frequency Attenuation |
10 |
| SNR |
19 |
Michael & Associates, Inc.
The following test results are from an 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 ANSI S3.19-1974. 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 |
36.2 |
| Standard Deviation |
3.9 |
3.3 |
3.3 |
3.8 |
4.5 |
4.7 |
4.6 |
3.3 |
3.6 |
| Assumed protection |
9.6 |
12.0 |
14.8 |
19.0 |
24.8 |
29.3 |
28.8 |
28.4 |
32.6 |