QSC CM16a User Manual download pdf (Page 3)

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

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

Maximum level +21 dBu

Inpedance 25 kΩ balanced

Common-mode rejection Typical,>50 dB,20 Hz-20 kHz

Worst Case,>40 dB at 20 kHz

rolling off to >40 dB at 20 kHz

Crosstalk

(inter-channel

within Data Port pair)

> 75 dB separation (20 Hz–20 kHz)

Crosstalk (intra-channel

between Data Ports) >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 data port connections

Monitor output 1

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 75Ω balanced

Output load 600Ω min

POWER AMPLIFIER OUTPUT MONITORING

OUTPUT SHORT DETECT:* Senses load < 1Ω for Stereo/Parallel modes;

< 2Ω Bridge Mono mode

Threshold is adjustable in software

OUTPUT OPEN DETECT:* Senses load > 60Ω

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

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

POWER AMPLIFIER MANAGEMENT

POWER AMPLIFIER INTERFACE:

Compatibility QSC Data Port equipped amps

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-channel amplifiers or four

4-channel amplifiers (or some combination

thereof)

AC POWER CONTROL:

AC mode control Switches amplifier between normal

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

(above 50°C)

Over-temp.alert Software adjustable threshold

CONTROL ROOM FOLDBACK MONITORING

NUMBER OF SIGNAL

MONITORING BUSES PER CM16a: 1

NUMBER OF CHANNELS PER CM16a: 4

INTERNAL SIGNAL MONITOR POINTS

(EACH WITH AN ATTENUATOR):

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 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 monitor input and signals from

internal monitor tap point

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

LEVEL: Adjusts amplitude of signal from tap point

Monitor in to monitor out 0 dB, ±1 dB

Control range -95.5 to 0 dB in .5 dB steps

INTERNAL DIGITAL TO ANALOG CONVERTER (DAC)

Internally generated test signals or pre-stored .WAV files can be routed to any/all inputs. This

preempts the paging input. .WAV files are network downloadable and can be stored to CM16a

internal memory.

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QSC CM16a User Manual Page 3

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