User Manual

2.23. Feedback Suppressor: Notch FBS
The Feedback Suppressor (subsequently referred to as FBS) is a function that prevents the unpleasant
acoustic feedback that occurs when sound from a speaker is picked up by a mic and re-amplified. In
addition to being unpleasant, acoustic feedback places a strain on the speakers, and can damage them.
To prevent such feedback, place the speakers so that their sound will not be picked up by the mic and
amplified. If acoustic feedback still occurs, you can use FBS to improve the feedback margin.
Notch FBS uses a notch filter to lower the level of the feedback point.
2.23.1. “Notch FBS” component editor
FIXED
After the speakers and mics have been installed, and while the DME7 settings are being made, this
method proactively finds feedback points in the current sound system, and applies the appropriate
filters. This is effective for mics whose position is fixed.
① FIXED [ON] button
Switches the detection result between enabled and disabled.
② [DETECT] button
Starts or stops detection. This is available only when online. Detection does not end automatically.
During detection, the DYNAMIC filtering is disabled. For details on the detection procedure, refer to
Performing FBS detection for the FIXED type.
③ [CLEAR] button
Clears the filter settings.
④ [Freq.]
Displays the frequencies of the filters that were applied. Up to seven filters will be applied.
DYNAMIC
This method continually finds the changing feedback points while the DME7 unit is in use, and updates
the filter settings accordingly. This is effective for wireless mics whose location is not fixed, and
which can be used in a variety of positions.
⑤ DYNAMIC [ON] button
Enables or disables the DYNAMIC function. FBS operation will begin when you turn this on.
2. Audio Components
68 | ProVisionaire Design Component Guide