Output Zone − Anti-Feedback - QSC MP-M80 User Manual

Output Zone − Anti-Feedback
For applications in which microphones will be used for live
sound reinforcement, the MP-M includes twelve narrow-
band, anti-feedback filters on each output. These filters
are extremely useful for eliminating feedback frequencies
while having very little effect on overall tonal balance. The
filters may be adjusted manually or automatically using the
"Feedback Wizard".
In most situations, it is not
NOTE!:
necessary to use all 12 filters to achieve a
stable system. Typically, 4 – 6 filters will be
sufficient. Use of more filters may degrade
sound quality unnecessarily.
1. button – Engages / disengages
Anti-Feedback In
the filters.
2. Feedback Frequency readout – The Anti-Feedback
system automatically identifies and displays suspected
feedback frequencies in real time.
3. Manual Kill button – When a suspected feedback
frequency is identified, touching this button applies a
filter at that frequency. The filter marker selected is
simply the first available marker numerically.
4. button – Touching this button opens the Feedback Wizard which will guide the operator through the anti-feedback process.
izard
5. Reset button – Sets all the Filter controls and markers to their factory default position. Note that the Feedback Wizard will only use a filter if its
Cut has been set to 0.0.
6. – Shows the frequency and depth (cut) of applied filters.
Display
• Vertical scale = dB
• Horizontal scale = frequency
7. Filter markers – These markers are color-coded to correspond with their associated controls. Horizontal position indicates frequency. The
amount of cut is indicated by a descending vertical line.
NOTE!: Markers and their associated frequency controls are not tied to a specific frequency band. Marker 1 may attenuate a high
frequency, while Marker 12 may attenuate a low frequency.
8. Filter In/Out – The numbered buttons engage/disengage the filters. When a filter is disengaged, the associated marker is not displayed.
9. Freq – Sets the center frequency of a filter.
10. Cut – Adjusts amount of Cut (or attenuation) for a filter. Range is from 0.00 dB to -20.0 dB.
11. Filter Depth – Increases or reduces the depth (amount of cut) for all the filters.
12. Filter Q – Adjusts the width of the filter from a Q of 10 to a Q of 30.
TD-001578-01-C
1 2
6
7
8
9
10
11
32
Touch Touch an Anti-
Outputs Feedback button
3 4 5
12