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Noise
Reduction
Rating
The Noise Reduction Rating shows the range of protection expected from this protector in
normal usage. The lower number is the amount of protection possible for most users (80%)
to achieve or exceed. The higher number is the amount possible for a few motivated
proficient users (20%) to achieve or exceed. Higher numbers denote greater protection.
Alpine Hearing Protection
Soesterberg, The Netherlands
Federal law prohibits
EPA
removal of this label
prior to purchase
Alpine L 25 Red
Variability of Noise Reduction as a Function of Noise Spectra
50
20th Percentile Noise Reductions
80th Percentile Noise Reductions
40
30
20
10
0
-2
0
2
4
Spectral Balance B = L C -L A (dB)
32
25,0
28,1
Alpine L 25 Red
Label required by U.S.
EPA Regulation
40 CFR Part 211, Subpart B
8
10
12
14
16
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