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	Up to eight 2-Ch. amplifiers or four 4-Ch.
	amplifiers ( or some combination thereof)
Amplifier status monitor
Clip indicator	Senses channel clipping

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
Configuration	Single-ended input
Resistance for closure detect <1kOhm max
Resistance for open detect	>5 kOhm min
Input Voltage Limit	7.000 VDC maximum

“-” input terminal connected to chassis

Output		1 discrete output
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
Connector	“Phoenix-style” (a.k.a.“Euro-style”)
	detachable terminal block connectors

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