Input Channel - Dynamics; Compressor - QSC MP-M80 User Manual

Input Channel − Dynamics
(Compressor / ANC)
The Input Channel Dynamics processing block may
be confi gured as either a Compressor or an Automatic
Gain Control (AGC).

Compressor

The Compressor controls the dynamic range of a signal
above a set Threshold.
1. Dynamics button – Selects the Compressor /
AGC screen.
2. Compressor / ANC button – Selects either
Compressor or AGC.
3. In switch – Engages and disengages the
Compressor or AGC processor.
4. Knee In button
– Determines how
abruptly or gradually the
compressor transitions
in and out of gain
reduction as the threshold
is crossed.
5. Simple button – Turns Simple mode on and off.
When on, it hides all controls except:
• Compressor / AGC
• Comp In
• Simple
• Reset
• Compression (Threshold)
All other controls remain at the value set prior to engaging the Simple mode button.
6. Reset button – Sets all the Compressor and AGC controls, for this channel, to their factory default position.
7. Input meter – Displays the RMS input signal level
8. Reduction meter – The red display indicates how much the signal is being reduced by the compressor. This meter displays a signal
regardless of whether the In button is engaged or not.
9. Output meter – Output level after any applied compression
10. Compressor graph – Vertical scale from 0 dB to -60 dB; horizontal measurement is time. When engaged, the trace displays.
• Threshold (A) – The level at which compression begins.
• Attack time (B to E) – The time it takes for the compression to reach its maximum compression after the input exceeds the
threshold level.
• Ratio (A to E) – The amount of compression applied to the signal.
• Release time (C to D) – The time it takes for the compressed signal to rise to the threshold level once the input level no longer exceeds
the threshold.
11. Threshold slider – Sets the point at which the compressor begins to reduce signal level.
12. Attack slider – Adjusts how quickly the compressor reacts to a signal that exceeds the threshold.
13. Release slider – Adjusts how quickly the compressor stops compressing when signal falls below threshold.
14. Ratio slider – Sets the ratio of input level change to output level change when the signal exceeds the threshold.
15. Nain slider – Adjusts the overall output gain to makeup any loss after the signal is compressed.
16. Compressor in/out indicator – When the Compressor (or AGC) is In, an orange "C" displays on the channel controls strip.
TD-001578-01-A
7
B C
Knee
E
In Out
Inputs Touch an Input Bank
(RCA / More)
1
3
2
8
11
10
12
D A
13
14
15
13
Touch a Channel
Dynamics Button
Mic/Line
4 5 6
9
16