21. APPROVALS
EARMOR® C52 have been tested and approved in accordance with EN 352-
1:2020/EN 352-4:2020,EN 352-6:2020, EN 352-8:2020. ANSI S3.19-1974
ANSI S3.19-1974
EARMOR® C52 Headset Attenuation data, American National Standards Institute
specifications: ANSI S3.19-1974
TEST FREQ.(HZ)
125
250
500
1000 2000 3150 4000 6300 8000
NRR
（
dB
）
MEAN
ATTENUATION(DB)
23.7 26.2 33.1 36.4 32.7 38.4 41.6 42.4 41.8
28
STANDARD
DEVEATION(DB)
2.7
2.3
2.2
1.8
1.7
3.0
3.1
3.0
2.6
EN 352-1:2020
f: Test frequency
MEANS and SID.DEV.: Mean value and standard deviation at each test frequency
MEAN-SD: APV-value at each test frequency in accordance with EN ISO 4869-2:2018 with the
parameter
α
= 1
H-, M- and L-: Values in accordance with EN ISO 4869-2:2018 with the parameter
α
= 1
SNR: SNR-value in accordance with EN ISO 4869-2:2018 with the parameter
α
= 1
Hm, Mm and Lm/Hs, Ms and Ls: The mean values Hm, Mm and Lm calculated in accordance
with EN ISO 4869-2:2018 and the corresponding standard deviations Hs, Ms and Ls
SNRm, SNRs: The mean value SNRm calculated in accordance with EN ISO 4869-2:2018 and
the corresponding standard deviation SNRs.
C52 Summary Attenuation Data for Hearing Protective Devices according
to EN352-1:2020
F(Hz)
63
125
250
500
1000
2000
4000
8000
SNR(dB)
MEANS
24.2
24.7
26.5
33.1
36.8
32.4
41.8
41.4
34
STD.DEV.
4.0
2.6
2.1
2.9
2.2
2.4
3.0
3.0
MEAN-SD
20.2
22.2
24.4
30.2
34.6
30.0
36.4
36.1
H84(dB) = 33dB
Hm = 35.1
Hs = 2.3
M84(dB) = 32dB
Mm = 33.7
Ms = 1.6
L84(dB) = 28dB
Lm = 29.3
Ls = 1.7
SNRm=35.3
SNRs=1.7