0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB,reference
20 Pa)
NC-20
NC-35
NC-50
NC-25
NC-30
NC-45
NC-40
SH
H
M
L
0
10
20
30
40
50
60
70
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound pressure level (dB,reference
20 Pa)
NC-20
NC-35
NC-50
NC-25
NC-30
NC-45
NC-40
SH
H
M
L
MWH011B/BR NC CURVE
MWH012B/BR NC CURVE
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