NC Curve
70
60
50
40
30
20
10
0
125
70
60
50
40
30
20
10
0
125
38
H
M
L
250
500
Octave-band frequency (Hz)
H
M
250
500
Octave-band frequency (Hz)
FWW02L
1000
2000
FWW03L
L
1000
2000
Sound Data
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
4000
8000
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
4000
8000