QSC CM16a User manual

NETWORK AUDIO SYSTEMS
The CM16a Amplifier Network Monitor is a key hardware component of QSControl, QSC's Ethernet based audio network. The CM16a
provides sixteen channels of gain control,monitoring,and amplifier management for DataPort-equipped QSC amplifiers.The CM16a
isoperatedremotely by a Pentium-basedPC orQSC System Controllerrunning QSControlapplicationsoftware.Controland monitoring
datais communicated betweenthe Pentium-basedPCor QSCSystemControllerandCM16a viaanEthernet network.TheCM16a,located
in the amplifier rack,is linked to each amplifier via a DataPort.
CM16a
Preliminary Specifications Amplifier Network Monitor
FrontView
RearView
1675 MacArthur Boulevard
Costa Mesa, CA 92626
Ph: 800/854-4079 or 714/957-7100
Fax: [phone]
Web: www.qscaudio.com
Email: [email protected]
Hear the Power of Technology.
CM16a Input / Output Control & Monitoring
•Inputsensitivityselection:1Vor3V
•Inputsourceselect:Normal/Page
•Gaincontrol
•Pre-/Post-faderaudio signal monitoring
•Mutecontrol
•Signalpolaritycontrol
•Signallevelmetering
Amplifier Output Monitoring
•Outputvoltageandcurrentmetering
•Amplifieroutputpowerin watts
•Outputclipdetection monitoring
•Amplifierheadroommetering
•Outputsignal(speakerterminal)audiomonitoring
Load Monitoring
•Open/shortedloaddetection
•Programmablethresholdfordetecting load opensandshorts
•Real-timeloadimpedancemeasurement
Amplifier Management
•ACstandby/operatemodeselection
•ACmode indication (off/standby/operate)
•Amplifierprotectstatusmonitoring
•Amplifieroperatingtemperaturemetering
•Amplifiergaincontrolmonitoring
•AmplifiermodelIDindication
•BridgeMono/Parallel/Stereo mode indication
Other Features
•Sixteenconfigurationpresets
•ExternalRS-232portfordiagnosticsandpresetcontrol
•InternalAudioDAC(DigitaltoAnalogConverter) for systemdiagnostics,
loadimpedancemeasurement,orplaybackofaudiofiles
•Contactclosureinput
•Pageinputwithselectable1Vor 3V sensitivity
•Onefloatingdry-contact SPDT relayoutput
•Single-linebalancedsummingaudiomonitorbus
•Front-panel bypassswitch
•Firmware updateablevianetworktoaddfutureupgrades

BLOCK DIAGRAM OF THE CM16
QSC Audio Inc. 1675 MacArthur Boulevard • Costa Mesa, CA 92626 •Ph: 800/854-4079 or 714/957-7100 •Fax: [phone] • www.qscaudio.com
System Controller and
QSControl Software
Locatedeitheronoroffsite.
QSC CM16a
Typical QSControl Network
QSC Amplifiers
AudioSignals
Ethernet Hub
Ethernet Connection
AudioControl and Monitor
(DataPortCable)
041000

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 kΩbalanced
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 VGAmonitorcable
Qualifiedlength 2 meters
Monitoroutput 1
Connector “Phoenix-style”(a.k.a.“Euro-style”)
detachableterminal blocks
Type Electronically balanced
Grounding Shield terminal connected to chassis
Nominal level +4 dBu
Maximum level +21 dBu
Output impedance 75Ωbalanced
Output load 600Ωmin
POWER AMPLIFIER OUTPUT MONITORING
OUTPUT SHORT DETECT:* Senses load < 1Ωfor Stereo/Parallel modes;
< 2ΩBridge 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 10kΩbalanced
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: 75Ωbalanced
Output load: 600Ωmin
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
preemptsthepaging input. .WAVfilesarenetworkdownloadable andcanbe storedtoCM16a
internal memory.

CONTACT CLOSURE INPUTS AND OUTPUTS
INPUTS: 1 discrete input
Configuration Single-ended input.
Resistance for closure detect < 1kΩmax
Resistance for open detect > 5kΩmin
Input voltage limit 7.000VDC maximum
Ground limits Potential to case:3V maximum
(“-”input terminal) Resistance to case:100Ω
OUTPUT: 1 discrete output
Configuration Electromechanical relay,dry contacts,
floating,C,NC,NO
Maximum steady-state current 0.5A
Maximum switched current 0.25A
Ground isolation 70V maximum
CONNECTOR: “Phoenix-style”(a.k.a.“Euro-style”)
detachable terminal block connectors
NETWORK INTERFACE
PHYSICAL NETWORK: Ethernet
Raw data rate 10 megabits per second
Frame format D.I.X.(Ethernet)
Connector RJ-45 female
Ethernet type 10BASE-T:(via RJ-45)
Cable type 10BASE-T:CAT-3 (or better) twisted pair
Max cable length 10BASE-T:100 m to hub
Grounding Floating
TRANSPORT NETWORK: TCP/IP
Internetwork protocol IP
Transport protocol UDP
APPLICATION PROTOCOL: QSC24
Version 1
Revision 7
RS-232 PORT
CABLE TYPE Null-Modem (a.k.a.Laplink)
PORT SETTINGS Bits per Second 9600
Data Bits 8
Parity none
Stop Bits 1
Flow Control Xon/Xoff
GENERAL
PHYSICAL
Height: 1.72”(1RU)
Width: 19”(standard rack mount)
Depth: 14.84”(37.7 cm),including rear supports
Weight 11 lbs.(5 kg)
Mounting: Rear support recommended for portable
or mobile use
OperatingTemp.: 0 to 50° C
AC POWER:
Voltage 100-240VAC (Universal Supply)
Current 1A RMS @ 120V,1.1A RMS @ 100V,
0.5A RMS @ 230V
Frequency 47–440 Hz
Specificationssubject tochange
ARCHITECT’S ANDENGINEER’SSPECIFICATIONS
The CM16a Amplifier Network Monitor shall provide input,output,and status control for Data
Port equipped QSC power amplifiers in an Ethernet-TCP/IP based network audio system.
Sixteen independent channels shall be provided, grouped in pairs to support up to sixteen
power amplifier channels.
Amplifier Input Control and Monitoring. For each of the sixteen power amplifier input
signals, the CM16a shall provide gain,mute and polarity control,pre- and post-fade signal level
metering and audio monitoring,and selectable +4 dBu/-10 dBV (3V/1V) input sensitivity.
The CM16a shall provide a page input,separate from the normal program inputs,whose signal
maypreempttheprogramsignalof anyorallof thesixteenprogram channels.Thisinput shall
have selectable +4 dBu/-10 dBV (3V/1V) sensitivity.
The CM16a shall provide an internal Digital to Analog converter circuit. Such circuit shall be
used for generating test signals and for playback of pre-recorded .WAV files. These .WAV files
shall be network downloadable and storable in the CM16a’s on-board memory. As with the
page input,this DAC circuit may preempt any or all of the sixteen program channels.
TheCM16ashallprovideforthestorageandrecallofuptosixteendifferentpresets,numbered
0 through 15. Each preset shall be a "snapshot" of all of the CM16a functions and settings.
Preset #0 shall be the default boot-up preset.
Amplifier Output Monitoring. For each of the sixteen power amplifier outputs, the CM16a
shall provide clip detect monitoring, short/open circuit detect, voltage and current metering,
amplifier headroom,load impedance,real output power to load,and audio monitoring of the
voltage signal.
AmplifierManagement. For eachofthe eight dual-channelpower amplifiers,theCM16a shall
provide AC standby/operate mode control,AC power state indication,temperature metering,
amp gain settings (front panel knob position with respect to full output), over-temperature
detection,stereo/parallel/bridge-monoindication,amplifier modeldetection,andprotect status
detection (subject to the capabilities of each amplifier).
Audio Monitoring Chain.For each of the sixteen program channels,the CM16a shall provide
threemonitorpointsasfollows:(1)prefadergaincontrol,(2)post fadergaincontrol,or(3)post
power amplifier output.A channel’s monitor output may be selected from one of these three
signals,or it may be switched off.The signal at the CM16a’s monitor output connector shall be
the sum of the signal at its monitor input connector and as many as four of the sixteen chan-
nel monitor signals at one time per CM16a.A monitor gain control shall be provided for each
monitor tap point to adjust the individual levels of the channel monitor signals prior to their
being mixed with the monitor input signal.
Contact Closure I/O. The CM16a shall provide one trigger contact-closure sense input which
shall also be TTL signal compatible, and one dry-contact floating SPDT relay output. These
shall be under software control, with functions definable by the QSControl custom software
application.
Data Network.All CM16a functions shall be controlled and monitored via an Ethernet digital
control network using the TCP/IP transport protocol and the QSC24 control and monitoring
applicationprotocol.Rear-panelconnections shallbe providedfor10BASE-TEthernetutilizing
a standard RJ45 Unshielded Twisted Pair Category-5 connection. Other than the AC power
switch,theCM16ashall havenomanual controls. A9-pin,"D"subminiatureconnectorshallbe
provided to allow interfacing to an RS-232 connection. This connector shall be used for
firmware upgrades as well as device testing and diagnosis via a computer’s COM port.
Amplifier Interface. The CM16a’s interface to each power amplifier Data Port shall be via a
miniature HD-15 connector. The amplifier interface shall use a standard personal computer
Video Graphics Adapter (VGA) CRT monitor cable.This interface shall transmit two amplifier
input audio signals as well as all control and monitoring signals. Special signal conditioning
and grounding techniques shall be used in this interface to ensure negligible levels of noise
and crosstalk.
General. All audio inputs and outputs shall be balanced with a nominal input level of +4 dBu
and maximum level of +21 dBu. Input connectors shall be of the "Euro-style" depluggable
barrier strip type.