500 Hz
250 Hz
1,000 Hz
4,000 Hz
2,000 Hz
20
15
10
5
0
-30
-25
-20
-15
-10
-5
dB
Hz
20
100
1k
10k
20k
2 ft. (0.6 m) from sound source
500 Hz
250 Hz
1,000 Hz
4,000 Hz
2,000 Hz
20
15
10
5
0
-30
-25
-20
-15
-10
-5
dB
Hz
20
100
1k
10k
20k
2 ft. (0.6 m) from sound source
CVB / C
CVB / O