
Bone Vibrators - NB noise effective masking level
Transducer
B71
B71
B81
B81
Impedance
50 Ω
50 Ω
10 Ω
10 Ω
Coupler
Mastoid
Forehead
Mastoid
Forehead
EM
EM
EM
EM
NB 125 Hz
NB 160 Hz
NB 200 Hz
NB 250 Hz
71
83
71
83
NB 315 Hz
68
80.5
68
80.5
NB 400 Hz
65
78.5
65
78.5
NB 500 Hz
62
76
62
76
NB 630 Hz
57.5
71
57.5
71
NB 750 Hz
53.5
66.5
53.5
66.5
NB 800 Hz
52
64
52
64
NB 1000 Hz
48.5
57
48.5
57
NB 1250 Hz
45
55
45
55
NB 1500 Hz
42.5
53.5
42.5
53.5
NB 1600 Hz
41.5
52.5
41.5
52.5
NB 2000 Hz
37
48.5
37
48.5
NB 2500 Hz
35.5
47.5
35.5
47.5
NB 3000 Hz
36
48
36
48
NB 3150 Hz
37
48.5
37
48.5
NB 4000 Hz
40.5
48.5
40.5
48.5
NB 5000 Hz
45
56
45
56
NB 6000 Hz
45
56
45
56
NB 6300 Hz
45
55
45
55
NB 8000 Hz
45
55
45
55
NB 9000 Hz
NB 10000 Hz
NB 11200 Hz
NB 12000 Hz
NB 12500 Hz
NB 14000 Hz
NB 16000 Hz
NB 18000 Hz
NB 20000 Hz
White noise
42.5
51
42.5
51
TEN noise