
0
10
20
30
40
50
60
70
80
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
N
-
NC-3
N
-4
NC-4
NC-60
NC-55
NC-50
Sound pressure level (dB, ref 20µPa)
0
10
20
30
40
50
60
70
80
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
N
-
NC-3
N
-4
N
-4
NC-60
NC-55
NC-50
Sound pressure level (dB, ref 20µPa)
M5AC030C/CR NC CURVE
M5AC040C/CR NC CURVE
62
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