QSC Audio CM16a manual Power amplifier management, Control room foldback monitoring

Section 4: Specifications

Power amplifier management

Power amplifier interface

Compatibility	QSC Data Port equipped amplifiers
Connector and cable
	HD-15 VGA cable, 2 meters length
	qualified (for longer runs, contact
	QSC’s Technical Services Department)
Amplifiers	16 amp channels grouped in pairs
Amplifier status monitor
Clip indicator	Senses channel clipping
Bridge mode status	Sense bridge mode setting

Protect indicator	Senses amplifier protect status
Temperature meter	Reports amplifier operating
	temperature
Over-Temp. Alert	Software adjustable threshold
AC power control
AC mode control	Switches amplifier between
	normal and standby mode
AC power indicator	Indicates operate, standby, or
	power-down mode

Control room foldback monitoring

Signal monitoring buses	1
(per CM16)
Number of Channels	4
Internal signal tap points
Pre-fader input signal	16
Post-fader input signal	16
Power amplifier output	16
Monitor input	Mixed with tap point signal at
	unity gain
Nominal level	+4 dBu
Maximum level	+21 dBu
Input impedance	10 kOhm balanced
Configuration	Electronically balanced, shield
	connected to chassis
Common-mode rejection	Typical, >50 dB, 20 Hz - 20 kHz
	Worst case, >40 dB, 20 Hz-20kHz

Output	Sum of Monitor input and
	signal from internal monitor
	tap point
Frequency response	25 Hz–20 kHz ±0.5 dB
Distortion	<0.05% THD @ +4 dBu out
Noise floor	-90.5 dB
Nominal level	+4 dBu
Maximum level	+21 dBu
Output impedance	75 Ohms balanced
Output load	600 Ohms minimum
Configuration	Active balanced
Level	Adjusts amplitude of signal from
	tap point
Monitor in to monitor out	0 dB, ±0.5 dB
Control range	-95.5 to 0 dB in 0.5 dB steps

Contact closure inputs and outputs

Inputs	1 discrete input (RLY/TRG IN)
Configuration	Single-ended input
Resistance for closure detect <1kOhm max
Resistance for open detect	>5 kOhm min
Input Voltage Limit	7.000 VDC maximum

Output	1 discrete output (RLY OUT)
Configuration	Electromechanical relay, dry
	contacts, floating, C, NC, NO
Steady-state current (max.)	0.5 A
Switched current (max.)	0.25 A
Ground isolation	70 volts maximum

“-” input terminal connected to chassis	Connector	“Phoenix-style” (a.k.a.“Euro-style”)
		detachable terminal block connectors

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