1. All headbands supplied with transducers comply with the ISO 389 series for that model of transducer unless oth-
erwise specified.
2. Headphone TDH-39 can be supplied with two different headbands, HB7 and HB8:
- For adult skulls or above normal skull size, HB8 shall be applied (HB8 is in compliance with ISO 389).
- For children and below normal skull size HB7 shall be applied (HB7 provides a greater force required to accommodate
smaller skull size)
For audiometric testing outside of noise attenuating test rooms, Otometrics recommends using earphones which feature
passive noise reduction. For the applicable earphone models, the attenuation is specified in the following table.
Sound attenuation values for earphones
Frequency Attenuation
(Hz)
TDH39 with
MX41/AR cushion
(dB)
EAR 3A
(dB)
HDA200
(dB)
HDA300
(dB)
63 12.5
125 3 33 14.3 12.5
160 4 34 15
200 5 35 16
250 5 36 16 12.7
315 5 37 18
400 6 37 20
500 7 38 23 9.4
630 9 37 25
750 -
800 11 37 27
1000 15 37 29 12.8
1250 18 35 30
1500 -
1600 21 34 31
2000 26 33 32 15.1
2500 28 35 37
3000 -
3150 31 37 41
4000 32 40 46 28.8
Otometrics - AURICAL Aud
25
17 Technical specifications
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