NC Curve
80
70
60
50
40
30
20
10
0
125
80
70
60
50
40
30
20
10
0
125
250
500
Octave-band frequency (Hz)
250
500
Octave-band frequency (Hz)
FTXS25A
Q
1000
2000
FTXS35A
Q
1000
2000
Sound Data
NC-70
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
4000
8000
NC-70
NC-65
NC-60
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
4000
8000
11