Chapter 4 - Special Test Procedures
Monaural Loudness Balance (MLB) Test
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.
4-3
1761-0100 Rev. B
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