
Insert Earphones - NB noise effective masking level
Transducer
EAR3A
IP30
EAR3A
IP30
Impedance
10 Ω / 50 Ω
10 Ω / 50 Ω
10 Ω / 50 Ω
10 Ω / 50 Ω
Coupler
2ccm
2ccm
711
711
EM
EM
EM
EM
NB 125 Hz
30
30
32
32
NB 160 Hz
26
26
28.5
28.5
NB 200 Hz
22
22
25.5
25.5
NB 250 Hz
18
18
21.5
21.5
NB 315 Hz
16
16
19.5
19.5
NB 400 Hz
13
13
17
17
NB 500 Hz
9.5
9.5
13.5
13.5
NB 630 Hz
9
9
12.5
12.5
NB 750 Hz
7
7
11
11
NB 800 Hz
6.5
6.5
10.5
10.5
NB 1000 Hz
6
6
11.5
11.5
NB 1250 Hz
8
8
14.5
14.5
NB 1500 Hz
8
8
15.5
15.5
NB 1600 Hz
8
8
15.5
15.5
NB 2000 Hz
9
9
17.5
17.5
NB 2500 Hz
11
11
19.5
19.5
NB 3000 Hz
9.5
9.5
19
19
NB 3150 Hz
10
10
19
19
NB 4000 Hz
10.5
10.5
20
20
NB 5000 Hz
10
10
23.5
23.5
NB 6000 Hz
7
7
21
21
NB 6300 Hz
7
7
21
21
NB 8000 Hz
5
5
20.5
20.5
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
0
0
0
0
TEN noise
16
16
25
25