80
70
60
50
40
30
20
10
125
250
70
60
50
40
30
20
10
0
125
250
2FDN200HY1
2FDN200HY1
H
500
1000
Octave-band frequency (Hz)
2FGN250HY1
2FGN250HY1
H
500
1000
Octave-band frequency (Hz)
2000
4000
2000
4000
Sound Data
NC70
NC65
NC60
NC55
NC50
NC45
NC40
NC35
NC30
NC25
NC20
8000
NC-55
NC-50
NC-45
NC-40
NC-35
NC-30
NC-25
NC-20
8000
19