
59
NC-45
NC-35
MAC/M4AC060C/CR NC CURVE
0
10
20
30
40
50
60
70
80
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound Pressure level (dB, ref 20µPa)
MAC/M4AC050C/CR NC CURVE
0
10
20
30
40
50
60
70
80
125 250 500 1000 2000 4000 8000
Octave-band frequency (Hz)
Sound Pressure level (dB, ref 20µPa)
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
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