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 fi lters on each output. These fi lters
are extremely useful for eliminating feedback frequencies
while having very little effect on overall tonal balance. The
fi lters may be adjusted manually or automatically using the
"Feedback Wizard".
NOTE!: In most situations, it is not necessary
to use all 12 fi lters to achieve a stable
system. Typically, 4 – 6 fi lters will be
suffi cient. Use of more fi lters may degrade
sound quality unnecessarily.
1. Anti-Feedback In button – Engages / disengages
the fi lters.
2. Feedback Frequency readout – The Anti-Feedback
system automatically identifi es and displays suspected
feedback frequencies in real time.
3. Manual Kill button – When a suspected feedback
frequency is identifi ed, touching this button applies a
fi lter at that frequency. The fi lter marker selected is
simply the fi rst available marker numerically.
4. izard button – Touching this button opens the Feedback Wizard which will guide the operator through the anti-feedback process.
5. Reset button – Sets all the Filter controls and markers to their factory default position. Note that the Feedback Wizard will only use a fi lter if its
Cut has been set to 0.0.
6. Display – Shows the frequency and depth (cut) of applied fi lters.
• 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 specifi c 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 fi lters. When a fi lter is disengaged, the associated marker is not displayed.
9. Freq – Sets the center frequency of a fi lter.
10. Cut – Adjusts amount of Cut (or attenuation) for a fi lter. Range is from 0.00 dB to -20.0 dB.
11. Filter Depth – Increases or reduces the depth (amount of cut) for all the fi lters.
12. Filter Q – Adjusts the width of the fi lter from a Q of 10 to a Q of 30.
TD-001578-01-A
1 2
6
7
8
9
10
11
32
Touch Touch an Anti-
Outputs Feedback button
3 4 5
12