1. The High Frequency Phones specified are the Sennheiser HDA 200 Phones.
2. The maximum hearing level for speech with the speech filter in place is 100 dB.
Note: The hearing levels listed in this table are guaranteed maximum levels. These
levels are guaranteed only if ANSI, ISO or GSI reference threshold levels, and not
customized calibration values, are used. The GSI 61 provides hearing level limits to
at least the values listed. However, at no time will the hearing level limit exceed 120
dB HL.
2-25
Chapter 2 - Installation
dB HL Limits per Frequency and Transducer continued
Test
Ear
Bone
Signal,
Phone
Vibrator-
Pure
Mastoid
Tone
Bone
E A R
Single
1761-9630 1761-9635 1761-9639
Vibrator-
Tone
Insert
Sound
Sound
Sound
Forehead 3A Insert
Phone
Field
Field
Field
Phone
45
45
45
Azimuth
Azimuth
Azimuth
55
105
95
80
96
92
80
N/A
N/A
80
N/A
N/A
80
N/A
N/A
80
N/A
N/A
75
N/A
N/A
50
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
105
2
65
Speach
Noise
9000
10000
11200
12500
14000
16000
18000
20000
Notes:
High
Frequency
Ea
1
Phone
N/A
100
95
95
84
75
55
33
14
1761-0100 Rev. B
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