MedRx AVANT REM (Real Ear Measurement) Installation Manual
Effective Date: 05-25-2017
22
Measuring Acoustic Feedback
Feedback (whistling, howling) is one of the most common complaints of hearing instrument
users. Even though many modern hearing instruments have sophisticated feedback
management systems, knowing exactly where the feedback is occurring can greatly reduce
the time required to resolve the problem. The AVANT REM+ system does an excellent job
measuring and displaying acoustic feedback.
1.
Place the calibrated probe tube in the ear canal
as instructed previously.
2.
Place the hearing instrument in the ear without
disturbing the probe tube.
3.
Begin a Live Speech Mapping session as
instructed previously.
4.
When feedback is present, Click the
Start
button.
5.
Acoustic feedback appears as a large spike in the
LSM response.
If a more specific frequency analysis of the
feedback is desired, change the resolution of the
system to 1/24 octave by Clicking the
Options
menu item and changing the Analyzer selection
using the pull-down menu. This image shows
the same feedback as above at
1/24 octave.
Using this information, make any necessary
adjustments to the hearing instrument to reduce
or remove the feedback.
