A) STANDARD EN 352-1:2020
3M strongly recommends personal fit testing of hearing protectors. Research suggests that users may
receive less noise reduction than indicated by the attenuation label value(s) on the packaging due to
variation in fit, fitting skill, and motivation of the user. Refer to applicable regulations and guidance on how to
adjust attenuation label value(s). In the absence of applicable regulations, it is recommended that the
attenuation label value(s) be reduced to better estimate typical protection.
A:A Foldable headband earmuff with foam cushions
Bull's Eye I H515FB
A:2 MV (dB)
A:3 SD (dB)
A:4 APV = MV - SD (dB)
A:6 S, M, L
A:B Headband earmuff with foam cushions
Bull's Eye III H540A
A:2 MV (dB)
A:3 SD (dB)
A:4 APV = MV - SD (dB)
A:6 S, M, L
A:1 f (Hz)
125
250
500
1000 2000 4000 8000
16.2 17.0 26.4 33.5 37.1 39.1 34.3 35.8 27.4 20.2 29.9
4.1
2.7
2.9
4.6
12.1 14.3 23.5 28.9 34.3 35.5 29.6
A:1 f (Hz)
125
250
500
1000 2000 4000 8000
18.1 24.5 36.4 37.9 36.4 39.3 37.6 37.4 33.7 25.5 35.1
2.2
1.8
2.4
1.8
15.9 22.6 34.0 36.1 33.6 36.0 33.8
H
2.8
3.6
4.7
2.7
33
H
2.9
3.3
3.7
2.5
35
A:5
M
L
SNR
2.4
2.7
2.4
168 g
25
18
28
A:5
M
L
SNR
1.2
1.4
1.3
293 g
32
24
34