QSC Audio Network Audio Systems Specifications, Input Signal, Power Amplifier Output Monitoring

Specifications

Input Signal
Frequency Response	20 Hz to 20 kHz, ±0.5 dB
	10 Hz to 80 kHz, ±3 dB
Distortion	<0.01% THD+N @ +4 dBu out
	(page input <0.03%)
Dynamic Range	>110 dB unweighted (20 Hz–20 kHz)
	(page input >100 dB)
Polarity	In-phase or reversed
Level Control Range	-95.5 to 0 dB in 0.5 dB steps
Precision Attenuator Transients
(“zipper noise”)	better than 112 dB below maximum output
Mute	>90 dB attenuation
Inputs
Program inputs	16
Paging input	1 Dedicated input with configurable
	routing to any or all 16 input sections
Monitor bus input	1
Connector type	“Phoenix-style” (a.k.a. “Euro-style”)
	detachable terminal blocks
Type	Electronically balanced
Grounding	All shield terminals connected
	to chassis
Nominal level	1V/3V rms selectable (-10 dBV/+4 dBu)
Maximum level	+21 dBu
Impedance	25 kΩ	balanced
Common-mode rejection	Typical, >50 dB, 20 Hz-20 kHz
	Worst Case, >40 dB at 20 kHz
Crosstalk (inter-channel
within DataPort pair)	>75 dB separation (20 Hz–20 kHz)
Crosstalk (intra-channel
between DataPorts)	>90 dB separation, 20 Hz-20 kHz
	measured with all inputs and
	outputs terminated
Outputs
Program outputs	16 (via HD-15)
Connector type	8 HD-15 DataPort connections
Cable type	VGA monitor cable 1
Qualified length	2 meters
Monitor output	1
Connector	“Phoenix-style” (a.k.a. “Euro-style”)
	detachable terminal blocks
Type	Electronically balanced
Grounding	Shield terminal connected to chassis
Nominal level	+4 dBu
Maximum level	+21 dBu
Output impedance	75Ω	balanced
Output load	600Ω	min
Power Amplifier Output Monitoring
Output Short Detect*	Senses load <1Ω for Stereo/Parallel modes;
	<2Ω Bridge Mono mode (default threshold)
	Threshold is adjustable in software
Output Open Detect*	Senses load >60Ω (default threshold)
	Threshold is adjustable in software
Output Voltage Meter	Range automatically matches to
	amplifier model used
Output Current Meter	Range automatically matches to
	amplifier model used
Amplifier Headroom	Reports remaining available power
Amplifier Gain*	Calculates and reports amplifier gain
	(knob setting)

Power Amplifier Management
Power Amplifier Interface
Compatibility	QSC DataPort-equipped amplifiers
Connector and cable	HD-15 VGA cable 1, 2 meters length 2
	qualified (for longer runs, contact QSC’s
	Technical Services Department)
Amplifiers	Up to 16 channels (8 DataPorts) of
	QSC DataPort-equipped amplifiers
Amplifier AC Power Control
AC mode control	Switches amplifier between operate
	and standby mode
AC power indicator	Indicates operate, standby, or
	power-down mode
Amplifier Status Monitor
Clip indicator	Senses channel clip status
Protect indicator	Senses amplifier protect status
Temperature meter	Reports amplifier operating temperature
Over-temp. alert	Software adjustable threshold (80°C default)
Control Room Foldback Monitoring
Number of Signal
Monitoring Buses per CM16a		1
Number of Channels per CM16a		4 (Maximum number assigned
		to monitor mix at one time)
Internal Signal Monitor Points
(each with individual level controls)
Pre-fader input signal		16
Post-fader input signal		16
Power amplifier output		16
Monitor Input	Summed with internal monitor mix
	at unity gain
Monitor in to monitor out	0 dB, ±1 dB
Nominal level	+4 dBu
Maximum level	+21 dBu
Input impedance	10kΩ	balanced
Configuration	Active balanced, shield connected to chassis
Common-mode rejection	Worst case, >54 dB at 20 Hz rolling off to
	>40 dB at 20 kHz
	Typical case, >50 dB 20 Hz-20 kHz
Output	Sum of external monitor input and signals
	from internal monitor mix
Frequency response	20 Hz–20 kHz, ± 0.5 dB
Distortion	<.05% THD @ +4 dBu out
Dynamic range	>90.5 dB unweighted, 22 Hz–22 kHz
Noise floor	-90.5 dB
Nominal level	+4 dBu
Maximum level	+21 dBu
Output impedance	75Ω	balanced
Output load	600Ω	min
Configuration	Active balanced
RS-232 Port
Cable Type	Null-Modem (a.k.a. Laplink), female 9-pin
	D-sub chassis connector
Port Settings	Bits per Second		9600
	Data Bits		8
	Parity		none
	Stop Bits		1
	Flow Control		Xon/Xoff

Page Input

*Signal level must be higher than -32 dB, referenced to maximum output of amplifier