
Earphones - NB noise effective masking level
Transducer
DD45
DD45
TDH50
TDH50
HDA200/DD450 HDA300
Impedance
10 Ω
10 Ω
60 Ω
60 Ω
23 Ω
23 Ω
Coupler
318-3
318-1
318-3
318-1
318-1
318-1
EM
EM
EM
EM
EM
EM
NB 125 Hz
51.5
49
51.5
49
34.5
31.0
NB 160 Hz
44.5
42.5
44
42.5
30
28.5
NB 200 Hz
37.5
36.5
37.5
36.5
26
26.5
NB 250 Hz
31
31
30.5
31
22
24
NB 315 Hz
26.5
26
26
26
19.5
20
NB 400 Hz
21.5
21
21.5
21
17.5
16
NB 500 Hz
17
17.5
17.5
17.5
15
12
NB 630 Hz
14
15.5
15.5
15.5
13
11
NB 750 Hz
11.5
14
13.5
14
11
9.5
NB 800 Hz
11.5
13.5
13.5
13.5
11
9
NB 1000 Hz
12
13.5
13.5
13.5
11.5
8
NB 1250 Hz
13
13.5
13.5
13.5
12
8.5
NB 1500 Hz
14
13.5
13.5
13.5
11.5
9
NB 1600 Hz
14
14
14.5
14
11.5
8.5
NB 2000 Hz
14
15
17
15
10.5
6
NB 2500 Hz
14
16.5
16
16.5
9
4
NB 3000 Hz
14
17.5
15.5
17.5
8.5
3
NB 3150 Hz
14
17.5
15.5
17.5
10
3.5
NB 4000 Hz
14
17
15.5
17
14.5
4.5
NB 5000 Hz
18
16
17
16
19
15.5
NB 6000 Hz
25.5
21
18.5
21
22
26
NB 6300 Hz
24
26
18.5
26
22.5
26.5
NB 8000 Hz
17
20.5
18
20.5
22.5
28
NB 9000 Hz
24
32.5
NB 10000 Hz
27
23
NB 11200 Hz
28
27
NB 12000 Hz
22.5
16
NB 12500 Hz
32.5
32
NB 14000 Hz
40
38.5
NB 16000 Hz
61
50.5
NB 18000 Hz
88
88
NB 20000 Hz
110
110
White noise
0
0
0
0
0
0
TEN noise
25
25
24.5
24.5