User's Manual

50
COMPATIBLE TRANSDUCERS
Type
Manufacturer
Model
Impedance
Supra-aural
headphones
Telephonics Corp.
TDH39
10 ohm (1 kHz)
Supra-aural
headphones
Radioear Corp.
DD45
10 ohm (1 kHz)
Insert earphones
Etymotic Research Inc.
ER-3C
10 ohm (1 kHz)
Bone vibrator
Radioear Corp.
B71
10 ohm (1 kHz)
AMBIENT NOISE ATTENUATION VALUES FOR TRANSDUCER
Freq
TDH 39 /
DD45
with MX41\AR or PN
51 cushions
ER-3C
[Hz]
[dB]
[dB]
125
3
33.5
250
5
34.5
500
7
34.5
750
-
-
1000
15
35
1500
-
-
2000
26
33
3000
-
-
4000
32
39.5
6000
-
-
8000
24
43.5