Operating Manual - nX, nXe, and nXp 150W/75W Power Amplifiers
34
Feedback Suppressor
(inputs only)
The feedback suppressor (FBS) provides automatic feedback control. This is done by constantly monitoring the audio and auto
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matically adjusting any one of 12 filters to remove feedback. Notch and parametric filter types are used, depending on the charac
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teristics of the feedback. Because feedback suppression is more effective on a single input than on a mix of channels, the FBS is
only available on inputs, and only at the 48 kHz sampling rate. The FBS uses a lot of DSP, so if FBS is used the FIR filter on the
same numbered output channel becomes disabled in order to allow the DSP power necessary for the FBS.
Filter Parameters
Filter (number) -
Current active filter (highlighted).
Filter In/Out -
Green = filter in (engaged), Red = filter out (disengaged).
Filter Lock -
Locks filter at its current setting, when locked the detector will no longer adjust the filter.
Filter Mode -
There are three filter modes:
Restricted
: Filter will only broaden or deepen.
Floating
: Detector may release filter after float time or modify filter type.
PEQ
: Detector will not modify the filter however the user may control the filter.
Type -
Selected filter type (parametric or notch).
Frequency
- Selected filter center or corner frequency.
Level
- Selected filter boost/cut amplitude.
Bandwidth
- Selected filter bandwidth or Q.
Feedback Detector Parameters
Sensitivity
- Detector sensitivity to feedback
Float Time -
Time before a floating filter will start to release.
