QSC Audio CM16a manual Specifications, Input Signal Processing, Power amplifier output processing

Section 4: Specifications

Input Signal Processing

Frequency response	20 Hz–20 kHz ±0.5 dB
	10 Hz–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 inverted
Level control range	-95.5 to 0 dB in 0.5 dB steps
Precision attenuator	better than 112 dB below
transients (“zipper”	maximum output
noise)
Mute	>90 dB attenuation
Inputs
Program inputs	16
Paging inputs	1
Monitor bus input	1
Connector type	Terminal block connectors (also
	called “Euro” or “Phoenix”-
	style”), detachable
Type	Electronically balanced
Grounding	All shield terminals connected to
	chassis
Nominal level	1V/3V rms selectable
Maximum level	+21 dBu
Impedance	10 kOhm balanced

Common-mode rejection	Typical, >50 dB, 20 Hz–20 kHz
	Worst Case, >40 dB at 20 kHz
Crosstalk (inter-	>75 dB separation, 20 Hz–20 kHz
channel within
Data Port pair)
Crosstalk (intra-	>85 dB separation,
channel, between	20 Hz–20 kHz
Data Port pairs)	measured with all inputs and
	outputs terminated
Outputs
Program outputs	16 (via HD-15)
Connector type	8 HD-15 data port connections
Pinout	Special, see appendix
Cable type	VGA monitor cable
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	75 Ohms balanced
Output load	600 Ohms minimum

Power amplifier output processing

Power amplifier output monitoring

Output short detect*	Senses load <1 Ohm for Stereo/
	Parallel modes; <2 Ohms in Bridged Mono mode
	Threshold is adjustable in software
Output open detect*	Senses load >60 Ohms
	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
Amp gain*	determines amplifier gain control setting, range atomatically matches to amplifier model

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

33