GSi AUDIOSTAR PRO Manuel D'instructions page 53

Power Amplifier and Speakers
Frequency Response
Total Harmonic Distortion
Talk Forward
Talk Back
Monitor
Aux Intercom
QuickSIN
BKB-SIN
D-0131088 Rev C, 2022-07
GSI AudioStar Pro Instructions for Use
With an input of 7 Vrms-Amplifier and
loudspeakers must be able to create a sound
pressure level of 100 dB at 1 meter and meet
the following requirements
125-250Hz, (+0/-10 dB)
250-4000Hz (+3 dB)
4000-6300Hz (+5 dB)
80 dB SPL <3%
100 dB SPL <10%
Communication and Monitoring
Permits the tester to speak through the test
microphone into the selected transducer at
approximately the level set by the front panel
controls
Allows the tester to listen to comments from the
patient in the testing booth
The monitor headset or monitor speaker built
into the instrument housing can be used by the
tester to listen to Channel 1, Channel 2, Aux
intercom, and/or Talk Back signals
The built-in Auxiliary Intercom and Assistant
headset allows the tester to speak directly to an
Assistant without the patient hearing the
conversation and allows the assistant to hear
what is being presented to the patient
Special Tests
Six (6) sentences with five (5) key words per
sentence are presented in four-talker babble
noise. The sentences are presented at pre-
recorded signal-to-noise ratios. The SNR's used
are 25, 20, 15, 10, 5, and 0.
18 List Pairs. The sentences are presented at
prerecorded signal-to-noise ratios that decrease
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