GSi AUDIOSTAR PRO Manuel D'instructions page 28

E A
LIMINATION OF MBIENT
Excessive noise in the test environment reduces test validity because it masks the test
signals. Maximum permissible ambient noise levels (MPANLs) are defined in the standard
ANSI S3.1-1991 (R2008) American National Standard Maximum Permissible Ambient Noise
Levels for Audiometric Test Rooms.
The following table shows the maximum background levels that can be present inside the
room while a valid hearing test from 125 Hz to 8000 Hz is being conducted. These values
apply for hearing threshold measurements to 0 dB HL. The standard specifies that MPANLs
should be adjusted appropriately when hearing thresholds for pure tones are measured
above and below 0 dB HL.
Maximum Ambient Noise (dB re: 20 µPa to the nearest 0.5 dB)
Supra-aural
Earphone
125
250
500
1000
2000
4000
8000
NOTE: Live voice testing requires a separate sound attenuated room for the patient to
avoid feedback and direct transmission of the test stimuli.
Sound Attenuation (dB) for Earphones per ISO 4869-1
DD45 Earphone
125
250
500
1000
2000
4000
8000
D-0131088 Rev C, 2022-07
GSI AudioStar Pro Instructions for Use
N
OISE
Insert Earphone
35
25
21
26
34
37
37
Insert Earphone
3
5
7
15
26
32
24
Ears not covered
i.e., Sound Field
59
53
50
47
49
50
50
DD450
33.5
34.5
34.5
35.0
33.0
39.5
43.5
Page 23 of 84
29
21
16
13
14
11
14
14.5
16.0
22.5
28.5
32.0
45.5
44.0