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Monaural Loudness Balance (MLB) Test
1761-0100 Rev. B
A comparison of perceived loudness growth is made between two different frequencies on
the same ear.
1.
The frequency where the best hearing is detected is used as the "reference" frequency for
the comparison of perceived loudness with tones at the impaired frequency. There should
be a difference of at least 25 dB between thresholds at each frequency tested.
2.
The output (tone) is routed to a single earphone (Right or Left).
3.
The procedure is essentially the same as the ABLB test. The signal is manually alternated
from frequency to frequency. The reference frequency is increased in intensity in 20 dB
steps above threshold.
4.
Instruct the patient to indicate when the two frequencies appear to be equal in loudness.
5.
The level at which the loudness of the test frequency balances the loudness of the
reference frequency is recorded.
Chapter 4 - Special Test Procedures
4-3
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Questions and answers
Can’t get screen on
The screen of the GSI 61 may not turn on due to a line voltage brownout or power interruption. The device is designed to protect against abnormal AC power conditions by returning to power-up initialization settings. If interference is too severe, the unit may enter a lockout mode, preventing front panel operations. To resolve this, turn off the power, wait approximately 30 seconds, and then turn it back on. If the issue persists, contact a service representative.
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