EAR PLUG DETAILED INFO...

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How to read this information:
   Any manufactured product has some variation between units normally. The same holds true with ear plugs. So rather than saying all earplugs will produce the exact same noise reduction, the testing standards for reporting require that two numbers are reported for each frequency: the typical (MEAN) amount of noise reduction for any given pair out of the manufacturing process, and the range of variation that can be expected from that number (STANDARD DEVIATION).
 
   About 68% of all units will be within 1 standard deviation of the mean; 94% will be within two standard deviations of the mean.
 
   Thus, if the data says that at 4000Hz the ear plug has a mean of 41.9dB and a standard deviation of 5.1dB, then 68% of all the ear plugs of that type will block between 36.8dB and 47.0dB at 4000 Hz, and 94% will block between 31.7dB and 52.1dB at that frequency.
 
   Follow this link to help you understand Standard Deviation, if you still need a better explanation.

To understand the frequency ranges, human voices usually occur in the band from 800 Hz to 4000 Hz, with an exceptionally deep male voice usually being around 600 to 1000 Hz and a very high pitched female scream can be as high as 3400 to 4000 Hz. A normal telephone's audio range is normally 300Hz to 3400Hz.


TYPE 1 - YELLOW PERMANENT (NRR 25dB)
Generally better for blocking high pitched noises
FREQUENCY
(in Hz)
125
250
500
1000
2000
3150
4000
6300
8000
←← Mostly Exhaust Noises  BOTH  Mostly Wind Noise →→
MEAN dB CUT
28.5 dB
30 dB
32.9 dB
33.5 dB
34.9 dB
40.4 dB
41.9 dB
42.7 dB
44.6 dB
STANDARD
DEVIATION
4.7 dB
4.6 dB
4.6 dB
4.0 dB
3.6 dB
5.4 dB
5.1 dB
3.3 dB
4.1 dB

TYPE 2 - BLUE PERMANENT (NRR 27dB)
Generally better for blocking mid-range noises (like a wife complaining)
FREQUENCY
(in Hz)
125
250
500
1000
2000
3150
4000
6300
8000
←← Mostly Exhaust Noises  BOTH  Mostly Wind Noise →→
MEAN dB CUT
22.9 dB
24.8 dB
28.9 dB
31.8 dB
35.4 dB
40.5 dB
43.1 dB
40.1 dB
38.1 dB
STANDARD
DEVIATION
1.6 dB
1.7 dB
2.0 dB
2.0 dB
2.7 dB
2.1 dB
2.9 dB
3.1 dB
3.0 dB

TYPE 3 - DISPOSABLE (NRR 29dB)
FREQUENCY
(in Hz)
125
250
500
1000
2000
3150
4000
6300
8000
←← Mostly Exhaust Noises  BOTH  Mostly Wind Noise →→
MEAN dB CUT
36.6 dB
38.7 dB
42.0 dB
39.3 dB
37.8 dB
43.7 dB
43.8 dB
45.0 dB
47.9 dB
STANDARD
DEVIATION
5.1 dB
4.1 dB
4.7 dB
3.9 dB
4.7 dB
3.5 dB
3.4 dB
3.2 dB
3.4 dB

If you want any of the above, give us a call or drop us an email! If you want to know what products we've added to line-up, ask to be added to our email list...


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Copyright 2004, all rights reserved. Material on this page may not be used or reused without express written permission from the copyright holder. For information on licensing, contact the webmaster. Marc Glasgow is a Macintosh "Mac" Consultant serving the Tampa Bay area since 1990.