QSC Audio Stereo System DSP 3 User Guide

DSP-3  
Digital Signal Processor  
Amplifier Accessory Hardware Manual  
TD-000087-00  
Rev.D  
*TD-000087-00*  
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TABLE OF CONTENTS  
Warnings, Explanation of Graphical Symbols, and FCC Statement..............................................................4  
Section 1: INTRODUCTION  
Overview......................................................................................................5  
General Use Guidelines..................................................................6  
QuickStart Guide............................................................................7  
Connector & Indicator Descriptions, Illustrations.................12  
Hardware Features and Functions...........................................14  
Block Diagram..........................................................................................16  
Technical Overview..................................................................................17  
Section 2: INSTALLATION  
Unpacking..................................................................................................18  
What is Included...................................................................................18  
Mounting to QSC DataPort Equipped Amplifiers..................................18  
Mounting to the Accessory Remote Mounting Bracket......................19  
Connecting Audio Inputs and Outputs...................................................20  
Connecting to the DataPort of the DSP-3.................................................21  
Connecting to RS-232 Port........................................................................21  
Daisy-chaining the DSP-3 Outputs.........................................................22  
Connection to Accessory External DC Power Supply.................22  
Applications Examples....................................................................23  
Section 3: SIGNAL MANAGER SOFTWARE  
System Requirements...........................................................................26  
Software Installation...........................................................................26  
Section 4: SPECIFICATIONS.........................................................................................................................................27  
Section 5: ARCHITECT’S & ENGINEER’S SPECIFICATION.....................................................................................29  
Section 6: APPENDIX  
DataPort Pinout.........................................................................................30  
RS-232 Pinout ............................................................................................31  
Terminal Block Connector Part Number Reference.............................31  
Application Information...............................................................32  
Preset Operation Notes.................................................................................33  
Section 7: QSC INFORMATION  
Maintenance, Warranty & QSC Contact Information................................34  
© Copyright 2001, QSC Audio Products, Inc.  
QSC® is a registered trademark of QSC Audio Products, Inc., Costa Mesa, CA  
QSCand the QSC logo are registered with the U.S. Patent and Trademark Office  
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WARNING!  
WHILE QSC HAS ENDEAVORED TO DEVELOP AND PRODUCE THE MOST DEPENDABLE AND ROBUST DIGITAL SIGNAL  
PROCESSOR (DSP) AUDIO PRODUCT FOR YOUR USE, DUE TO THE UNLIMITED AND POTENTIALLY DESTRUCTIVE (TO THE  
SOUND SYSTEM) CONFIGURATIONS THAT MAY BE APPLIED TO THE DSP BY THE USER, QSC CANNOT BE HELD RESPON-  
SIBLE FOR DAMAGES RESULTING FROM ANY DEVIATION OR FAILURE BY THE USER TO STRICTLY FOLLOW THE RECOM-  
MENDATIONS SET FORTH IN THE OWNERS MANUAL FOR THE INTEGRATION OF THE DSP-3 AND SIGNAL MANAGER  
SOFTWARE WITH YOUR SOUND SYSTEM.  
ALL RISKS ATTENDANT TO INTEGRATION OF USER-CONFIGURABLE DSP PRODUCTS WITH YOUR SOUND SYSTEM ARE  
ASSUMED BY YOU. WHILE QSC STRIVES TO SUPPLY THE HIGHEST QUALITY TECHNICAL SOLUTIONS FOR DIGITAL SIGNAL  
PROCESSING, IN NO EVENT WILL QSC OR ITS SUPPLIERS BE HELD LIABLE FOR ANY DAMAGES, CONSEQUENTIAL,  
INCIDENTAL, OR OTHERWISE, INCLUDING ANY CLAIMS FOR LOST PROFITS AND/OR SAVINGS RESULTING FROM ANY  
ATTEMPTED INTEGRATION OF THE DSP-3 AND SIGNAL MANAGER SOFTWARE WHICH DOES NOT STRICTLY ADHERE TO  
THE MANUALS RECOMMENDATIONS.  
IMPORTANT SAFETY INFORMATION: PLEASE REVIEW!  
EXPLANATION OF GRAPHICAL SYMBOLS  
The lightning flash with arrowhead symbol, within an equilateral  
triangle, is intended to alert the user to the presence of uninsu-  
lated “dangerous voltage” within the product’s enclosure that  
may be of sufficient magnitude to constitute a risk of electric  
Federal  
Communications  
shock to humans.  
Commission (FCC)  
The exclamation point within an equilateral triangle is intended  
to alert the users to the presence of important operating and  
maintenance (servicing) instructions in the literature accompa-  
Information  
NOTE: This equipment has been tested  
nying the product.  
and found to comply with the limits for a  
ClassBdigitaldevice,pursuanttoPart15  
CAUTION  
of the FCC Rules. These limits are de-  
RISK OF ELECTRIC SHOCK  
DO NOT OPEN  
signed to provide reasonable protection  
against harmful interference in a com-  
mercialinstallation.Thisequipmentgen-  
erates, uses, and can radiate radio fre-  
quency energy and, if not installed and  
usedinaccordancewiththeinstructions,  
may cause harmful interference to radio  
communications.Operationofthisequip-  
ment in a residential area is likely to  
causeharmfulinterference,inwhichcase  
the user will be required to correct the  
interference at his or her own expense.  
CAUTION: To reduce the risk of electric shock, do not  
remove the cover. No user-serviceable parts inside.  
Refer servicing to qualified service personnel.  
WARNING: To prevent fire or electric shock, do not  
expose this equipment to rain or moisture.  
SAFEGUARDS  
Electrical energy can perform many useful functions. This unit  
has been engineered and manufactured to assure your personal  
safety.Improperusecanresultinpotentialelectricalshockorfire  
hazards. In order not to defeat the safeguards, observe the  
following instructions for its installation, use and servicing.  
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Section 1: Introduction- Overview  
The DSP-3 is a digital signal processor (or DSP ) accessory for  
audio power amplifiers designed to reduce the need for exter-  
nalsignalprocessingwhileincreasingoverallsystemreliability  
through distributed intelligence. It is intended primarily for  
QSC’s CX, DCA, and Powerlight2 series amplifiers and mounts  
directlytotherearpanelofthe2-RU,2-channelmodelsofthese  
amplifiers. Pre-August, 1999 date-code of the CX, DCA and  
Powerlight2, and all ISA models will require use of an external  
power supply. Use of the DSP-3 with Powerlight models  
requires remote mounting, external power supply and use of a  
specialinterconnectcable(PL6.0/9.0only). RefertotheAppen-  
dix for application information. The DSP-3 can also be used  
with amplifiers that do not have a QSC DataPort (older QSC  
models, non-QSC models) with a reduced feature set and  
“remote” mounting/external power.  
3 is mounted remotely on a rack-mount accessory that provides  
a solid physical mounting platform.  
Connections include three D-sub type connections; a DB-9  
connector acts as the RS-232 interface and an HD-15 through-  
connector provides the DataPort interface to the amplifier and  
other QSC DataPort products (if used). The “exposed” side has  
four terminal block connectors; 2 audio inputs and 2 post DSP  
outputs. There is also a power receptacle for using the DSP-3  
with amplifiers that do not provide the required power through  
theirDataPort,suchastheISA-series, olderQSCamplifiers and  
non-QSCamplifiers. TherearetwoLED’s;ablueonetoindicate  
power status and a green one to indicate the presence of an  
input signal to the DSP-3.  
Control of the DSP-3 is accomplished with the supplied QSC  
Signal Manager software. Networked control using the  
QSControl platform is also possible (refer to QSControl docu-  
mentationfordetails). Pleaserefertothesoftwaredocumenta-  
tion (software Help file and Readme.txt file) for feature-set and  
operation information. This software provides an easy-to-use  
graphical user interface where DSP “objects” are placed onto  
apaletteandinterconnectsaredrawn.Thisinterfaceallowsfor  
almost infinite configuration possibilities.  
The signal processing capabilities include an Input Com-  
pressor-limiter,multipleParametricFilters,High-andLow-Pass  
Filters, a Shelf Filter, Muting, Attenuation, Multiple Delays,  
Polarity Reversal, Audio Routing and Post Crossover Audio  
Mixing. Analog-to-digital and digital-to-analog converters are  
24 bit resolution, 48 kHz. sampling rate. Additionally, the post-  
DSP output signals are daisy-chainable for connection to a  
second amplifier. Input sensitivity is selectable and dynamic  
rangeisgreaterthan93dB.Inputsandthepost-DSPoutputsare  
electronically balanced. See Hardware Features for complete  
listing.  
Connection of the DSP-3 to the host computer is made by  
connectinga serialcablebetweentheDSP-3’sRS-232portand  
the host PC’s available COM port. Once the DSP-3 has been  
setup as desired and the configuration saved to the DSP-3,  
connection to the PC is no longer required. This feature allows  
essentially tamper-proof amplifier DSP setup. Further changes  
can be implemented in the field by simply connecting a PC (i.e.  
laptop computer) and loading the new setup into the DSP-3.  
Physically, the DSP-3 is a small module that “piggybacks”  
ontothebackpanelofthespecifiedQSCamplifiers. Itconnects  
directly to the DataPort on the back panel and is secured with  
supplied hardware. When used with other amplifiers, the DSP-  
Note: Powerlight 6.0 and Powerlight 9.0 amplifiers require that pin #9 be removed from the remote  
mounting interconnect cable. Amplifier damage may result from use of cable that has pin #9 connections present.  
Normal VGA computer monitor cables have pin #9 removed and are usable. Check before use!  
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Section 1: Introduction- DSP-3 General Use Guidelines  
IMPORTANT! Pleas read before operating the DSP-3  
with your audio system.  
TheDSP-3isaprofessionallevelDSPproductthatallowsthe  
user to produce virtually unlimited signal processor varia-  
tions and configurations. Because of the infinite configura-  
tion possibilities of digital signal processing and the DSP-3,  
it is possible to create configurations that may result in  
unwanted signals or uncontrollable output  
Signal Manager has no way of knowing if the DSP configu-  
ration you have designed will produce the results you intend  
toproduce. Youcancreatesignalloopsinyourconfiguration  
that may oscillate and you may damage your sound system  
ifyouapplysuchconfigurationstotheDSP-3. Whenapplying  
an untested configuration or when designing or experiment-  
ing with the DSP-3, it is a very good idea to turn down the  
amplifier’s physical gain controls. That way, you won’t  
damageyourspeakersorcreateveryloudsoundsifyouapply  
a configuration that doesn’t do what you thought it would.  
As a general rule, DO NOT CREATE SIGNAL LOOPS! Do not  
mix the output of a DSP object back into its own input! There  
isnothingusefultoachievebydoingthat,youwillonlycreate  
anoscillatorthatcoulddamageyouspeakers. Also,USETHE  
SINEANDNOISEGENERATOROBJECTSWITHGREATCAU-  
TION! These objects produce signals that can harm your  
speakers. Turndownthegain. Ifyoudon’thearasignalwhen  
you think you should, DO NOT INCREASE THE GAIN!!! If the  
signal isn’t audible at lower levels, there is something else  
wrong. Turning up the gain to full exposes you and your  
system to the possibility that some loose connection some-  
where will suddenly send a full-amplitude signal through  
your sound system.  
Like all freely configurable signal processing tools, the DSP-  
3 will do what the configuration you design tells it to do,  
which may not be what you expect it to do, so use caution.  
6
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Section 1: Introduction- Quick Start  
This quick start section is for those users who want to get up and running with the DSP-3 and Signal Manager  
software as quickly as possible. It is in no way a substitute for reviewing the contents of the entire hardware  
manual. Itisintendedforpeoplefamiliarwiththeequipmentdiscussedandshouldbefollowedupwithareview  
of the manual and the software help file.  
This is the same material covered in the Signal Manager software help file, only presented on paper so that you  
may “get right to it”.  
1
TURN THE EQUIPMENT OFF & INSTALL THE HARDWARE  
If you are using the DSP-3 with.......  
Then you need to.....  
QSC Powerlight2, CX, DCA 2-channel, 2-RU am-  
plifiers (or later direct-mount applications)  
Mount the DSP-3 to the amplifier by plugging it into the amp’s DataPort and  
securing it with the supplied hardware. External power may be required for  
older models (see Appendix).  
Mount the DSP-3 remotely and connect a QSC DataPort cable between the  
amplifier’s DataPort and the DSP-3’s “backside” DataPort. External power  
may be required for older models (see top of page 2).  
QSC 4-channel CX & DCA amplifiers (or later  
models with full-featured DataPort that do not  
support direct mounting of the DSP-3)  
Mount the DSP-3 remotely and connect a MODIFIED QSC DataPort cable  
(male-to-femalecablewithpin#9removed)betweentheamplifier’sDataPort  
and the DSP-3’s “backside” DataPort. Connect the external power supply to  
the DSP-3’s EXTERNAL POWER jack.  
QSC Powerlight 6.0 or Powerlight 9.0  
Mount the DSP-3 remotely and connect a QSC DataPort cable (male-to-  
female)betweentheamplifier’sDataPortandtheDSP-3’sbacksideDataPort.  
Connect the external power supply to the DSP-3’s EXTERNAL POWER jack.  
QSC Powerlight, all except 6.0 & 9.0  
a non-DataPort amplifier (QSC USA, PLX or non-  
QSC models  
Mount the DSP-3 remotely. Connect the DSP-3’s CHANNEL 1 OUTPUT and  
CHANNEL 2 OUTPUT to the appropriate amplifier inputs (see p.18 for  
pinouts). Connect the external power supply to the DSP-3’s EXTERNAL  
POWER jack.  
2
CONNECT THE COMPUTER TO THE DSP-3  
Use a 9-pin serial data cable to connect the DSP-3’s RS-232 connector to the computer’s available COM port (the 9-pin serial port  
connectoronthebackofthePC).COM1throughCOM4areusablewiththeSignalManagersoftware.COM1isthedefaultportinSignal  
Manager;useCOM1foryourconnectionifitisavailable. Ifnot, youwillneedtoselecttheappropriateCOMportintheSignalManager  
program after you install it in step 5.  
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Section 1: Introduction- Quick Start  
3
CONNECT THE AUDIO INPUTS  
Then you need to......  
If your using.......  
connectyourinputsignalsourcetoterminalblockconnectors  
(refer to page 18) and plug the connectors into the CHAN-  
NEL 1 INPUT and CHANNEL 2 INPUT receptacles.  
the CHANNEL 1 INPUT & CHANNEL 2 INPUT connectors  
the DataPort input (QSC CM16a or related products)  
connect the DataPort output from the CM16a (or other  
related DataPort product) to the DataPort input of the DSP-  
3. Use a QSC DataPort cable (male-to-male) for this connec-  
tion. Refer to page 19.  
4
TURN THE AMP GAIN DOWN, POWER UP THE AMPLIFIER & THE DSP-3  
IftheDSP-3requirespowerfromtheaccessoryexternalpowersupply,apply  
power to the DSP-3 FIRST, then turn on the amplifier. The power supply must be  
plugged into an operational AC power receptacle. Then plug the “barrel” connector  
(coaxialpowerplug) fullyintotheEXTERNALPOWERreceptacleontheDSP-3.When  
power is properly applied to the DSP-3, the blue POWER LED will be illuminated. Use  
aplasticwire-tie(tie-wrap)tosecuretheaccessorypowersupply’scordtotheDSP-3’s  
chassis; there is a metal tab on the chassis for this purpose.  
If the DSP-3 is powered by the amplifiers DataPort, the amplifier must be  
connected to an operational AC power receptacle. Then turn the amplifier “on” using  
its power switch. The blue POWER LED on the DSP-3 will illuminate a few seconds  
after the amplifier’s power switch is activated. If the DSP-3’s blue POWER LED does  
not illuminate, you may have an older QSC DataPort equipped amplifier that requires  
use of the accessory external power supply (refer to the Appendix for complete  
application information).  
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Section 1: Introduction- Quick Start  
5
INSTALL THE SOFTWARE  
1. Place the QSC Signal Manager CD in your computer’s CD drive (typically the D:\ drive). The installation program should run  
automatically after several seconds; if it does not, then proceed with step 2:  
2. Run D:\Setup.exe (replace D: with the drive letter designator appropriate for your system) and follow the instructions displayed.  
3. When the installation is complete, you will be presented with a screen that prompts you to view the “Readme” file. Please take  
time to read this- it contains important up-to-date information on the software.  
4. After installation, you will have an icon on your computer’s “desk top” labeled Signal Manager. Use this icon to start the  
application (double-click on the Signal Manager icon, this will start the program).  
5. Using the Menu Bar (see below) at the top of the window, choose the “Help” item and read the software help section. The help  
system includes the contents of this hardware manual for “paperless” reference.  
6. IMPORTANT! The DSP-3 is shipped with all of its presets configured to pass full-range audio signals through both channels.  
THIS MAY NOT BE APPROPRIATE FOR YOUR SETUP! Be sure to configure any necessary crossovers , filters, etc. prior  
to applying audio signals to the inputs. Damage to equipment may result if these recommendations are not followed.  
WHAT THE SIGNAL MANAGER APPLICATION LOOKS LIKE  
This screen-shot is what a typical Signal Manager “configuration” looks like (example only):  
TITLE BAR  
MAIN PALETTE  
DRAWING TOOLS PALETTE  
FILTERS PALETTE  
INPUTS AND OUTPUTS PALETTE  
MISC PROCESSORS PALETTE  
DSP TOOLS PALETTE  
MENU BAR  
FILE VIEW PANE  
WORKSPACE PANE  
CURSOR POSITION PANE  
RESOURCE METER PANES  
SPLITTER BAR  
STATUS BAR  
CAPS LOCK INDICTAOR  
NUM LOCK INDICATOR  
CONFIGURATION STATUS PANE  
COMMUNICATION STATUS PANE  
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Section 1: Introduction- Quick Start  
6
ESTABLISH COMMUNICATION BETWEEN THE DSP-3 & THE COMPUTER  
At this point, you should have everything “up and running”. In the Signal Manager application, check the  
COMMUNICATION STATUS PANE (lower right corner of the Signal Manager window, see above).  
If the COMMUNICATION STATUS PANE indicates.....  
Then you need to......  
ONLINE  
Do nothing! Your communication settings match the COM port  
you connected the DSP-3 to.  
Select Tools from the Menu Bar, select Options; the Options  
dialog box will open. Click on the DSP tab. In the Serial Port  
Selection field, click on the “down arrow” next to the port  
selectiondatawindow.AdropdownlistofCOM1throughCOM4  
willappear.SelecttheCOMportnumberthatcorrespondstothe  
COM port of your computer that the DSP-3 is connected to. Click  
OK (at the bottom of the dialog box); the dialog will close. Exit  
Signal Manager and restart it so that the newly selected  
COM port will become active. The Communication Status  
pane should now indicate ONLINE if everything was connected  
and set up properly.  
OFFLINE  
7
ENSURE THE AMPLIFIER IS TURNED DOWN AND THAT YOU HAVE SUITABLE  
SPEAKERS CONNECTED FOR YOUR INTENDED CONFIGURATION  
For familiarization with the DSP-3 and the Signal Manager software, we recommend that you use a pair of full range  
speakers connected to your amplifier and that the amplifier gain be reduced to the minimum useful setting. This will  
allow you to configure the DSP-3 almost anyway you desire while providing audio output to verify that the DSP-3 is  
doing as you intend. Small, high-power rated monitor speakers are perfect for the task.  
Better safe than sorry! Dont turn you amp all the way up; if communica-  
tions between the computer and DSP-3 fail for any reason, unexpected  
output transients could damage your speakers  
8
CREATE A SIMPLE DSP CONFIGURATION  
n
From the Menu Bar, select Configuration, New. If there was a default configuration on the Workspace, you will be prompted to close  
the “current” configuration first.  
n
Locate the Inputs and Outputs palette; left-click on the icon labeled IN1. Move your pointer into the upper left area of the Workspace  
and left-click the mouse again. The IN1 object should now be on your workspace.  
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Section 1: Introduction- Quick Start  
n
Now select the OUT1 icon from the same palette (left click on the OUT1 icon). Move your pointer into the upper right area of the  
workspace, in line with the IN1 object you just placed, and left click again. The OUT1 object should appear.  
n Select the GAIN icon in the MISC PROCESSORS palette (it looks like a little wedge and is the left-most icon in this palette). Move your  
pointer to the workspace in between (and in line with) the IN1 and OUT1 objects; click the mouse button again. The GAIN object should  
appear.  
n
Go to the DRAWING TOOLS palette and select the DRAW (pencil) icon. Notice that the IN1 object has a small yellow-colored “node”  
on its right side. This is its connection node or the point that “wires” are drawn from. Similarly, note the same yellow-colored nodes on the  
GAIN and OUT1 objects. Draw a “wire” from the IN1 object to the left side of the GAIN object. Draw another “wire” from the GAIN object  
(right side) to the OUT1 object.  
The DRAW tool works by clicking on one of the nodes that you want to draw a wire between, then, while holding down the  
mouse button, dragging the wire to the other node. You can change the drawing mode from click-drag-release wiring to  
click-clickwiringintheTools,Optionsdialogbox;selecttheDrawingtabandmakeanydesireddrawingbehaviorchanges.  
n
When everything is placed on the workspace and connected with “wires”, go to the Menu Bar and select Configuration, then Apply  
toDSP(orjustclickontheApplytoDSPiconintheDSPToolspalette).Thiswillsendyourconfiguration(andanyobjectparametersettings)  
fromthecomputertotheDSP-3. TheDSP-3’soutputswillbemutedwhiletheconfigurationisloaded. Forcomplexconfigurations, thiscould  
take several seconds.  
n If you have active audio inputs connected to the DSP-3 and the amplifier’s gain is sufficient, you will probably hear your audio material  
at this point. If not, double-click on each of the GAIN objects and increase the gain setting as required. Also in the Tools, Options dialog,  
the DSP tab has settings for input and output sensitivity for the DSP-3; these may require adjustment dependant on your particular set up.  
n
The Communication Status pane should indicate “ONLINE” and the Configuration Status pane should indicate “ACTIVE”. If you get  
an error message when applying the configuration to the DSP-3 (i.e. “Failed to connect to DSP-3”) check the cable connection between the  
DSP-3 and the computer’s COM port. Ensure that the correct COM port is selected in Signal Manager’s Tools, Options, DSP settings dialog  
box.  
n
Repeat the above procedure, this time using IN2, OUT2 and a GAIN object. This will give you a signal path with gain adjustment for  
channel 2. Be sure to “Apply to DSP”. This sends your updated configuration from your computer to the DSP-3.  
ThelastappliedconfigurationthatisrunningintheDSP-3whenitisturnedoffbecomestheactiveconfigurationagainonce  
thepoweristurnedbackontotheDSP-3. Thisensuresthatthesystemcomesupjustasitwasleftlasttimeitwaspowered  
down.  
If you decide to edit an existing configuration, you will need to “unlock” the configuration after opening it. Just select  
Configuration from the Menu Bar, then select Edit. The palettes that were “grayed out” will now appear in their normal,  
coloredstateandyouwillbeabletoedittheconfiguration.Afteryoureditingiscomplete,selectConfigurationfromtheMenu  
Bar and then Apply to DSP.  
Thats it for the Quick Start. For more information, review this manual and the softwares help file.  
11  
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Section 1: Introduction- Basic Connector & Indicator Descriptions  
FRONT PANEL  
CH1OUTPUT,CH2OUTPUT--These terminal-  
CH1INPUT,CH2INPUT-Theseterminal-block  
jacks (receptacles) are where you connect the  
line-level audio inputs to the DSP-3.  
blockjacksprovidespost-DSP(processed)signal  
from the DSP-3 for downstream devices (ampli-  
fiers, monitoring busses, daisy-chaining the pro-  
cessed signal to a second amplifier). In the case  
of non-DataPort amplifiers, these are the DSP-3  
output that gets connected to your amplifier’s  
input connector.  
They are electronically balanced with an input  
impedanceof8.3kOhm. Ifusedinanunbalanced  
configuration,theinputimpedanceis3.7kOhms.  
SIGNALindicator-Thisgreen  
LED illuminates when the  
DSP-3detectsaninputsignal  
oneitherchannel. Dualbright-  
ness levels indicate signal  
level. At -40dB, it will light  
dimly; at -20dB it will light  
brightly.  
EXTERNAL POWER-  
2.5mmbarrelconnector-  
Center (+), Outer(-), 15  
VDC, 300mA. Use only if  
your amplifier does not  
supply the required op-  
erating voltage from its  
DataPort (or non-  
DataPort amps).  
DATAPORT- This is the “in-  
put” DataPort. If the DSP-3 is  
used with QSC DataPort prod-  
ucts that can supply the audio  
inputsorprovideamplifiercon-  
trol&monitoring, thisiswhere  
they are connected to the DSP-  
3.  
RS-232- This DB-9 fe-  
male jack is where the  
serialcablebetweenthe  
DSP-3andthecomputer  
is plugged in.  
POWER indicator- This blue  
LEDilluminateswhentheDSP-  
3 has power properly applied.  
12  
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Section 1: Introduction- Basic Connector & Indicator Descriptions  
REAR PANEL  
DATAPORT (unlabeled)- This is the “output”  
DataPort.  
If the DSP-3 is directly mounted on a 2-RU QSC  
DataPortequippedamplifier, thisconnectorplugs  
into the amplifier’s DataPort connector.  
If used with 3-RU QSC DataPort equipped amplifi-  
ers, the DSP-3 will need to be remotely mounted  
and a male-female DataPort cable used to inter-  
connect the amp & DSP-3.  
If used with a non-DataPort amp (QSC or other),  
this connector will not be used.  
OVERALL  
13  
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Section 1: Introduction- List of Functions & Features  
DSP-3 Hardware Features (full set available to QSC DataPort equipped amplifiers):  
High- and Low-Pass Crossover  
Selectable responses:  
Butterworth (6,12,18 or 24 dB per octave slope)  
Bessel (6,12,18 or 24 dB per octave slope)  
Linkwitz-Riley (12 or 24 dB per octave slope)  
Graphical response curve provided in software  
Adjustable frequency & slope  
Ability to bypass all EQ with a single mouse click  
Ability to add or delete EQ  
Assignable anywhere in signal chain  
High- and Low-Pass Shelf Filter  
Adjustable corner frequency  
Adjustable Q factor  
Adjustable gain  
Graphical response curve provided in software  
Ability to bypass all EQ with a single mouse click  
Ability to add or delete EQ  
Assignable anywhere in signal chain  
Output Peak Limiter  
Adjustable threshold  
Adjustable attack time  
Adjustable release time  
Graphical response curve provided in software  
Ability to quickly bypass limiter with a single mouse click  
Assignable anywhere in signal chain  
Multiple Delays  
910 millisecond maximum ( sum of all delay objects)  
20.83 microsecond increments  
Entry can be in seconds, feet or meters  
Assignable anywhere in signal chain.  
14  
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Section 1: Introduction- List of Functions & Features  
Parametric EQ  
Adjustable frequency  
Adjustable gain  
Adjustable Q factor  
Ability to bypass all EQ with a single mouse click  
Ability to add or delete EQ  
Graphical response curve provided in software  
Assignable anywhere in the signal chain  
Signal Compressor  
Adjustable attack and release times  
Adjustable Gain  
Adjustable threshold  
Adjustable compression ratio  
Graphical response curve provided in software  
Assignable anywhere in the signal chain  
Signal Level Meter  
Peak or rms response  
Signal Attenuation (mute or bypass)  
Mix Post Crossover Audio (2 to 1 mixer with mute and lock all channels featured)  
Signal Splitter  
External Contact Closure Sensing (pin #9 of RS-232, operates with Switched Gainobjects in Signal Manager software)  
Pink & White Noise Generator  
Variable Frequency Tone Generator  
Clip & Protect Indication  
Signal Polarity Reversal  
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Section 1: Introduction- Block Diagram  
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Section 1: Introduction- Technical Overview  
This portion of the introduction provides some of the technical details of the DSP-3.  
Audio Input Path  
to non-QSC amplifiers (or any amplifier that does not have a  
There are two audio channels each with two input connectors, a  
balanced 3-pin ‘euro’ terminal block jack and an electronically  
balanced DataPort input. The inputs are protected with a filter that  
prevents radio frequency interference. The inputs have software-  
selectablefullscaleinputlevelsensitivity; thisisthelevelatwhich  
the analog to digital converters reach their full scale digital value.  
Refer to the Specifications section for full details. The DataPort is  
scaled to clip with a full scale digital input if the DSP-3 does not  
change gain structure. Each CODEC input is diode protected to  
prevent any large signal from destroying its inputs.  
DataPort). External power is provided by the accessory power  
supply (“wallwart”)viaacoaxialpowercordjackonthebackofthe  
DSP-3.  
When using the external power source, we recommend  
that the DSP-3 be powered-up before the amplifier in order  
to insure trouble-free start-up. This will also avoid the  
possibility of thumps & bumpsshould the DSP-3 be pow-  
ered up after the amplifier.  
Audio Output Path  
Data Acquisition  
The first stage the audio passes through is an inverting gain stage.  
The second stage is a second order Butterworth low pass filter that  
removes high frequency sampling artifacts. The signal is then sent  
out of the DSP-3 through the DataPort or the output ‘Euro’ connec-  
tors. The output level is selectable in software.  
The DSP-3 samples the IMON and VMON (current and voltage monitor-  
ing from the amplifier) lines of QSC amplifiers (via the DataPort) in  
order to perform dynamics (limiter, compressor, etc.) processing.  
The four inputs (IMON and VMON for both channels) are continuously  
sampled by a four channel ADC. When used with non-QSC  
amplifiers or QSC amplifiers that have no DataPort, the  
power limiter DSP objectis not available as this function  
relies upon amplifier current and voltage feedback. The  
DSP-3 will also not be able to monitor the protect or power status  
of the amplifier as these features require amplifier data via a  
DataPort connection.  
Power Supply  
No external power supply is needed for use with the CX, DCA and  
PL2two-channel, 2RUseriesamplifiersproducedwith date-codes  
of August, 1999 or later. With these models, the DSP-3 is supplied  
powerfromthe amplifier viatheDataPort(HD-15)connection. CX,  
DCA, and PL2 amps made prior to August 1999 DO NOT  
provide adequate power supply voltage to the module,  
requiring the use of the same type of external DC supply as  
used with Powerlight amplifiers. The amps in question will have a  
serial number PRIOR to 0899XXXXX, where the first four digits of  
the serial number are the MMYY datecode. Again, the modules  
WILL work with these amps just fine, but will require the use of our  
external power supply. External power is not required for all other  
directly-mounted-to-amplifiersituations.  
Contact Closure  
One contact closure input is provided. It uses pin 9 of the RS-232  
DB-9 connector (not normally used for RS-232). Shorting this pin to  
ground with a maximum impedance of 1.3 kOhms will cause a  
general purpose I/O pin of the DSP to be pulled to a logic low. The  
currentreleaseofSignalManagersoftwareusesthisinputtoallow  
switched gain functions. Each of the Switched Gain blocks will be  
switched simultaneously by the single contact closure (switch).  
EachSwitchedGainblockhasatwogainsettings;oneforopenand  
one for closed switch conditions.  
When used with the Powerlight series of amplifiers (or 3 RU & 4-  
channel amps), the DSP-3 requires use of the accessory external  
supply.Theaccessoryexternalsupplyisalsousedwhenconnecting  
17  
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Section 2: Installation- Unpacking and Mounting  
UNPACKING  
TherearenospecialunpackingprecautionsfortheDSP-3. However, itisrecommendedthatyoukeeptheoriginalpackingmaterialforreuse  
in the rare event that service be required for your DSP-3. If service is required and the original packing material is not available, insure that  
the DSP-3 is adequately protected for shipment (strong box of appropriate size , sufficient packing material).  
WHAT IS INCLUDED IN THE CARTON:  
Item  
1-  
Description  
Quantity  
DSP-3 Digital Signal Processor  
3-pin terminal block connector plug  
#4-40 machine screw, 1.125” long  
#8-32 machine screw, 0.312” long  
Hardware Manual (this document)  
Signal Manager Software CD disk  
1
4
2
1
1
1
2-  
3-  
4-  
5-  
6-  
DIRECT MOUNTING THE DSP-3 TO 2-CHANNEL, 2 RU QSC DATAPORT EQUIPPED AMPLIFIERS (CX, DCA, Powerlight2)  
The DSP-3 mounts directly to the rear of 2-channel, 2-RU, DataPort equipped QSC amplifiers.  
1- Configure the amplifiers DIP switches (QSC amplifiers where the DSP-3 covers the configuration switches) as follows:  
•All filters off  
•Clip limiter off  
•Mode set as required  
2- Align the DataPort plug on the back of the DSP-3 with the DataPort jack on the back of the amplifier and gently push the DSP-3 to seat  
the connector.  
3- Install the two #4-40 screws to secure the left side of the DSP-3 to the amplifier. These two long screws pass through the DSP-3 and  
thread into the inserts on the DataPort (HD15) jack. (see below). Use a #1-size phillips driver; be sure not to overtighten.  
Be sure to secure the DSP-3 using all three mounting screws. The DSP-3s backsideDataPort connector can be  
easily damaged if the DSP-3 is twisted and there are no supporting screws to properly secure it to the chassis.  
4- Install the #8-32 screw (0.312 inch long) to secure the right side of the DSP-3 to the amplifier (see below).  
18  
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Section 2: Installation- Remote mounting (4-ch., Powerlight & non QSC amps)  
REMOTE MOUNTING THE DSP-3 : 4-Channel CX and DCA , Powerlight series, and all non-QSC amplifiers  
Use of the DSP-3 with the 4-channel CX and DCA and all Powerlight amplifiers requires the remote mounting of the DSP-3. Use with non-  
QSC amplifiers also requires remote mounting. Keep in mind that all applications that use amplifiers that do not have a DataPort ( i.e. non-  
QSC amplifiers) some of the dynamic processing capabilities of the DSP-3 will not be available.  
Accessory Remote Mounting Bracket- This accessory is a 19”, 2-RU panel with mounting facilities for up to four DSP-3 modules. It is  
intended to be mounted to the rear-support rails of an equipment rack. The bracket kit comes with one large bracket ( the 19”, 2-RU size)  
and four smaller right-angle brackets that are used for securely mounting up to four DSP-3’s in a 2-RU space. Adjustable rack ears are  
included for maximum mounting flexibility.  
1- Attach the right-angle bracket to the DSP-3 module. The right-angle bracket is attached as shown, below.  
2- Attach the DSP-3 & right-angle bracket to the main 19” bracket as shown, below.  
3- Mount the main bracket assembly in your equipment rack  
between the rear support rails.  
4- Attach the inputs, outputs, DataPorts,  
RS-232 and external power as required.  
19  
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Section 2: Installation- Connections  
CONNECTING AUDIO INPUTS AND OUTPUTS:  
The audio inputs and outputs of the DSP-3 use 3-pin “Phoenix”-type (Euro-style) terminal block connectors. These connectors allow pre-  
wiring of inputs without any soldering and allow for rerouting of audio inputs by simply interchanging connector locations without the need  
for any tools. See Appendix for connector manufacturer’s part number reference.  
Inputs- The audio input can be from one of two sources; the front-panel DataPort OR the terminal-block  
INPUT connectors.  
Do not use both sets of inputs at the same time! Use balanced connections  
for the lowest possible noise levels and for minimizing the possibility of hum inducing ground loops.  
Outputs-The DSP-3’s post-DSP (processed) audio is output to the rear-panel DataPort ANDthe terminal-  
block OUTPUT connectors.  
The OUTPUT’s can be used for daisy-chaining the processed audio to  
additional amplifiers, even when connected to a DataPort-equipped amplifier via the rear-panel DataPort.  
Balanced connection is recommended for all inputs.  
The terminal block inputs on the DSP-3 are electronically  
balanced. Balanced input cables are recommended to mini-  
mize noise pick up and prevent ground loops.  
Unbalanced inputs can be used if required. If unbal-  
anced audio sources are used, it is preferable to use an  
appropriate audio transformer (or other unbalanced-to-bal-  
anced “converter”) to provide a balanced input to the DSP-3.  
Ifthisisnotpossible,thenitisrecommendedthatthenegative  
terminalandshieldterminalbeconnectedtooneanotherwith  
a jumper wire.  
Withtheconnectororientedasshownattheright,connectthe  
positive (+) signal wire to the left-most  
Toconnectyoursignalwiretotheterminal-blockplug-backthescrewsout  
a few turns to open the wire-clamp, carefully insert the conductors into the proper  
location, and retighten the clamping screw.  
The recommended stripping length for the wires is approximately 6 to 8  
mm ( 1/4 to 5/16 inch). When stripping the audio cable, be careful not to nick or  
cut the conductor strands. After each conductor has been stripped and dressed,  
insert it fully into the connector and tighten the retaining screw. When stranded  
wire is used, carefully twist the conductor strands together so that when they are  
inserted into the connector assembly, no loose strands short adjacent terminals.  
20  
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Section 2: Installation- Connections  
DATAPORTConnection-Thissectionappliestothoseusersinterfacing  
withtheQSCDataPortproducts.IfusingtheDataPortforyouraudioinputs,  
DO NOT use the terminal block inputs. If the DataPort is used only for  
control&monitoringoftheamplifier(noaudioinputthroughtheDataPort),  
then audio input may be via the terminal-block connectors.  
The front-panel DataPort connection is used for connecting to  
QSC DataPort products. Use a QSC DataPort cable (male-to-  
male) similar to VGA computer monitor cables. Do not use com-  
puter VGA cables as they are not correctly constructed for  
use with the DSP-3. QSC DataPort cables may be obtained  
through your QSC distributor or by calling QSC’s Technical Services  
Department. The plugs and jacks are the same physical size as the  
RS-232 connections; be careful not to get them confused.  
The rear-panel DataPort connection from the DSP-3 to QSC  
amplifiers is made when mounting the DSP-3 to the rear of the  
amplifier. The DataPort connection from any other accessory to the  
DSP-3 is made by orienting the connector properly, inserting it fully  
into the jack and finger-tightening the retaining screws. The audio  
signals on the rear-panel DataPort are post-DSP (processed).  
DataPort Connection: 15-pin Cable  
Front panel DataPort connection is not required for the operation  
of the DSP-3.  
RS-232 PORT Connection- Connection to the RS-232 port is made  
usinga9-pinserialdatacable(male-to-female).Cablelengthshouldbe25  
feetorless.OrienttheDB-9plugcorrectly,inserttheplugfullyintotheRS-  
232 port and finger-tighten the retaining screws.  
DSP-3 setup and programming takes place through the RS-232 port. Any  
time setup changes are required to the DSP-3, it must be connected to its  
host computer through the RS-232 port. If “real-time” control of the DSP-  
3 is required, the RS-232 port connection must be maintained as well. If  
“real-time” control is not required, then the DSP-3 can be setup first and  
then disconnected from the PC.  
The RS-232 connection does not have to be maintained for the  
DSP-3 to operate.  
RS-232 Connection: 9-pin Cable  
Setup & programming can also be done via Ethernet network  
communication when using QSCs QSControl products. Refer to  
QSControl documentation for detailed information.  
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Section 2: Installation- Connections  
DAISY-CHAINING THE DSP-3 OUTPUTS TO ADDITIONAL AMPLIFIERS  
The DSP-3 provides audio output jacks for each channel. These outputs may be used for daisy-chaining the post-DSP signal to other  
amplifiers or for monitoring purposes. The signal on the output jacks is post-DSP. All signal processing functions done by the DSP-3 effect  
the signal provided to the output connectors as well. The terminal block outputs are active even when the DataPort connections are used.  
To daisy-chain the DSP output, connect the output jacks of the DSP-3 to the input jacks of the next amplifier. Make sure that  
all interconnecting cables are balanced and connected properly.  
CONNECTION TO ACCESSORY EXTERNAL DC  
POWER SOURCE  
When the DSP-3 is used with QSC Powerlight amplifiers  
that do not provide the required +15VDC through their  
DataPort connection OR is used with non-DataPort ampli-  
fiers,powermustbesuppliedtotheDSP-3fromanexternal  
power supply.  
QSC offers an accessory external power supply for applica-  
tions with non-QSC amplifiers or with QSC Powerlight models  
QSCoffersanaccessory externalpowersupplyforapplica-  
that do not provide the required operating voltage.  
tions where a DataPort that provides +15 VDC is not  
available. Contact QSC’s Technical Services Department  
for details. Although not recommended, third-party ex-  
ternal power supplies may work with the DSP-3 provided  
they are of the correct voltage, voltage type (DC) , current  
rating and polarity. Any damage to the DSP-3 caused by  
connection to a non-QSC external power supply is not  
covered under the warranty.  
Ensure that any external power supply connected to  
the DSP-3 is of the proper voltage type, level and  
current rating.  
Be certain that the connector polarity is correct as  
there is no industry standard!  
Connection to an improper voltage source can cause  
immediate damage to the DSP-3!  
Insert the coaxial power plug into the EXTERNAL  
POWER jack. Ensure that the plug is firmly seated in  
the jack. Use the tabprovided on the chassis for  
securing the power cord with a tie-wrap (wire-tie).  
22  
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Section 2: Installation- Application Examples  
The following examples show basic hook up information that assumes a two-channel, full range audio signal driving the load. Refer to your  
amplifier’s hardware manual for other output configurations. All audio signals are line level.  
DSP-3 Directly Mounted to QSC Amplifier. Audio Inputs via Terminal Block Inputs  
DSP-3 Directly Mounted to QSC Amplifier. Networked OR Local Control. Audio Inputs via DataPort.  
NOTE: External accessory power supply may be required on older models, see page 2 for full application information.  
23  
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Section 2: Installation- Application Examples  
DSP-3 Remotely Mounted used with QSC DataPort Amplifier. Audio Input via Terminal Block Inputs  
DSP-3 Directly Mounted to QSC Amplifiers, Networked Control via QSCcontrol Products  
NOTE: External accessory power supply may be required on older models, see Appendix for application information.  
24  
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Section 2: Installation- Application Examples  
DSP-3 Remotely Mounted connected to any Non-DataPort Amplifier.  
Audio Input via Terminal Block Inputs  
25  
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Section 3: Signal Manager Software- Software Installation  
System Requirements- To use QSC Signal Manager, you need the following hardware and software:  
• IBM compatible computer, 200 mHz or greater Pentium Processor  
• Windows 98/2000/ME or Windows NT 4.0 with service pack 6a or later  
• SVGA display at 800 x 600 minimum resolution, 1024 x 768 recommended  
• CD-ROM drive  
• 32 MB or more of RAM  
• 10 MB of free hard disk space  
• An available RS-232 serial communications port (COM port) capable of 38.4k baud  
• A male-to-female 9-pin serial cable (to connect the DSP-3 to available COM port)  
Software Installation-  
1. Insert the CD labeled QSC DSP-3 Signal Manager into your CD drive (typically drive “D:”). If your computer has AUTORUN enabled, the  
installation utility will start automatically. If it does not, then proceed to step 2, below. Otherwise, proceed to step 3.  
2. Run D:\Setup.exe (replace “D” with your CD drive’s designation if necessary) and follow the instructions displayed.  
3. When the installation is complete, you will be presented with a screen that prompts you to view the “Readme” file. Please  
take time to read this- it contains important information on how to use the software.  
4. After installation, you will have an icon on your desk top labeled “Signal Manager”. Use this icon to start the application.  
5. Using the main menu bar at the top of the window, choose the “Help” item and read the software help section. The help system includes  
6. IMPORTANT!TheDSP-3isshippedwithallofitspresetsconfiguredtopassfull-rangeaudiosignalsthroughbothchannels.THISMAY  
NOTBEAPPROPRIATEFORYOURSETUP!Besuretoconfigureanynecessarycrossovers, filters, etc. priortoapplyingaudio  
signals to the inputs. Damage to equipment may result if these recommendations are not followed.  
OVERALL NOTES AND WARNINGS-  
The last applied configuration that is runningin the DSP-3 when it is turned off becomes the active configuration again  
once the power is turned back on to the DSP-3. This ensures that the system comes upjust as it was left last time it was  
powered down.  
Do not run your amplifier wide open(maximum gain) while making real-time adjustments to the DSP-3s setup. The  
nature of the communication path between the PC and DSP-3 is inherently more complex than direct physical controls of  
an equivalent analog processing device. Unpredictable results may occur due to failure of the PC or the communications  
channel. Under such circumstances, damage to your drivers is possible if the amplifier gain is set for high power levels.  
Use the minimum useful gain settings while making system adjustments.  
26  
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Section 3: Specifications  
Signal Processing 24 bit, 48 kHz.  
Common-mode rejection  
Crosstalk  
>50 dB, 20 Hz–20 kHz  
Frequency response  
at 3dB below full  
scale input voltage  
20 Hz–10 kHz 0.3 dB (term. block inputs)  
20 Hz–20 kHz 0.7 dB (term. block inputs)  
20 Hz–20 kHz 0.2 dB (DataPort inputs)  
>75 dB separation, 20 Hz–20 kHz  
Distortion  
<0.01% THD+N @ +4 dBu out  
687.5 microseconds  
Outputs  
Delay (throughput)  
Dynamic range  
Program outputs  
Connector type  
Pinout  
2 (via HD-15)  
HD-15 DataPort connection  
Special, see appendix  
QSC DataPort cable  
2 meters  
>93 dB unweighted  
20 Hz–20 kHz, 1.5V, 4V and 9V sensitivity  
>88dB unweighted  
Cable type  
Qualified length  
20 Hz–20kHz, 18V sensitivity  
Polarity  
Mute  
In-phase or inverted  
>90 dB attenuation  
Daisy-chain output  
Connector  
2 (1 per channel)  
“Phoenix-style” (a.k.a.  
“Euro-style”) detachable  
terminal blocks  
Inputs  
Program inputs  
Connector type  
2
“Phoenix-style” (a.k.a.  
“Euro-style”) detachable terminal blocks  
Type  
Grounding  
Electronically balanced  
Shield terminal connected to  
chassis  
Type  
Grounding  
Electronically balanced  
All shield terminals connected to  
chassis  
Output level  
(full scale)  
6.0 or 4.0 Vrms  
18.0 or 14.5 dBu  
15.5 or 12.0 dBv  
Input sensitivity  
1.5, 4.0, 9.0 or 18.0 Vrms  
(full scale input level)  
6, 14.5, 21.5 or 27.5 dBu  
3.5, 12.0, 19.0 or 25.0 dBv  
Output impedance  
600 Ohms balanced  
Units are selectable in software interface  
Impedance  
8.3 K Ohm balanced  
3.7 K Ohm unbalanced  
Power amplifier connectivity  
Power amplifier interface  
Amplifiers  
one 2-Ch. amplifier per DSP-3  
Compatibility  
all QSC and non- QSC amplifiers  
Amplifier status monitor  
Clip indicator  
Full-feature set  
Connector and cable  
all QSC DataPort equipped amplifiers  
Senses channel clipping  
Senses amplifier protect status  
Protect indicator  
(status monitoring not available for non-DataPort amplifiers)  
HD-15 VGA cable, 2 meters length  
qualified (for longer runs, contact  
QSC’s Technical Services Department)  
RS-232 Port  
Cable Type  
9-pin serial cable, male-to-female  
25 feet (7.6 meters)  
Maximum Length  
Contact closure input (sense)  
Inputs  
Configuration  
1 discrete input (pin #9 of RS-232 port)  
Single-ended input  
Resistance for closure detect <150 Ohms  
Resistance for open detect >1.9 K Ohms  
TTL Compatible  
Maximum Voltage= +9vdc  
Note: Specifications are subject to change without notice.  
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Section 3: Specifications  
General  
Physical  
Accessory External Power Supply  
Height  
Width  
Depth  
3.50 inches  
3.75 inches  
1.38 inches  
AC Input Voltage  
AC Input Current  
Frequency  
80–240 VAC  
0.3 Amps rms  
50 to 60 Hz  
Output Voltage  
Output Current  
15 VDC  
300 milliamperes  
Weight  
0.59 lbs (0.27 kg)  
Output Termination Detachable power cord with 2.5mm  
barrel-type (coaxial) connector  
Mounting  
Direct mount to amplifier or  
remote mount  
center pin is positive  
Operating temperature  
0 to 50° Celsius  
Note: Specifications are subject to change without notice.  
Dimensions  
28  
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Section 4: Architects and Engineers Specifications  
Contact Closure I/O—The DSP shall provide a trigger input  
The Digital Signal Processor (DSP) shall provide two independent  
channels of DSP for signal delivery to QSC DataPort equipped  
poweramplifiers. TheprocessingshallbedistributedwiththeDSP  
module mounted directly to the rear of the power amplifiers.  
usable for contact-closure (or other) purpose which shall  
be CMOS & TTL signal compatible.  
Power Supply—The DSP shall be provided power through its  
DataPort connection to QSC amplifiers. For older ampli-  
fiers or non-QSC amplifiers, a coaxial power jack will be  
provided on the DSP for connection to an external power  
source. Power required shall be +15 VDC at 300 mA  
(max.).  
Output Peak Limiter—For each audio channel, the DSP shall  
provide a peak limiter that is assignable anywhere in the  
signalchainandcanbeswitchedonoroff.Thelimitershall  
provide the following adjustments:  
Gain  
Amplifier Interface—The DSP shall attach directly to the rear of  
eachpoweramplifier.TheDSP’sinterfacetoeachpower  
amplifierDataPortshallbeviaanHD-15connector. This  
interfaceshalltransmittwoamplifierinputaudiosignals  
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  
andcrosstalk.Fornon-DataPortamplifiers,thereshallbe  
mounting and interface options provided for operating  
with the DSP.  
Threshold  
Attack time  
Release time  
High- and Low-Pass Crossovers—For each channel of audio,  
the DSP will provide high-pass and low-pass crossovers  
that are assignable anywhere in the audio chain. The  
crossovers must be capable of being switched in or out  
of the signal chain. The DSP shall provide the following  
crossover responses:  
Butterworth (6,12,18,24 dB per octave slope)  
Bessel (6,12,18,24 dB per octave slope)  
Linkwitz-Riley (12 & 24 dB per octave slope)  
Amplifier Output Monitoring—When used with QSC DataPort  
amplifiers, the DSP shall provide clipping and protect  
status detection at the amplifier’s output terminals.  
Noise & Tone Generation-- The DSP shall provide pink and  
whitenoisegenerationcapability.Itshallalsoprovidefor  
tone generation.  
High-andLow-PassShelfFilters—Foreachaudiochannel,the  
DSP shall provide high-pass and low-pass shelf filters  
that are assignable anywhere in the audio chain. The  
shelf filters must be capable of being switched in or out  
of the signal chain. The DSP shall provide the following  
shelf filter adjustments:  
Presets— The DSP shall be capable of storing at least 8 preset  
configurations. The control software shall provide man-  
agement of these presets.  
Variable corner frequency  
Variable gain  
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 “Phoenix” detach-  
able terminal block type.  
Variable slope  
Compressor-- The DSP shall provide a signal compressor that is  
assignable anywhere in the signal chain. It shall have adjustable  
threshold, attack time, release time, and compression ratio.  
Control— The DSP shall be configurable via RS-232 or via a  
networked DataPort connection.  
The Digital Signal Processor shall be the QSC DSP-3.  
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Section 5: Appendix- DataPort Pinout  
DATA PORT PINOUT  
The diagram below shows the pin assign-  
ments used for the HD-15 connectors on  
the DSP-3 and amplifier.  
Pin  
Signal Description  
NOTE!  
1
Ch. 1 Minus (-) Input Signal  
AC Standby Control  
This information is shown for reference  
2
only and is subject to change without no-  
3
V- MON Ch. 1 and Subcode 1  
I- MON Ch. 1 and Subcode 2  
Clip/Protect Ch. 1  
tice as the DataPort feature is specific to  
QSC products and not intended for inter-  
face to other manufacturer’s equipment.  
4
5
6
Hard Ground  
7
Ch. 1 Plus (+) Input Signal  
Ch. 2 Plus (+) Input Signal  
+15V from Amplifier  
8
9
10  
11  
12  
13  
14  
15  
Data Reference Ground  
Ch. 2 Minus (-) Input Signal  
Amplifier IDR (Model ID)  
V- MON Ch. 2 and Subcode 3  
I- MON Ch. 2 and Subcode 4  
Clip/Protect Ch. 2  
Note: Powerlight 6.0 and Powerlight 9.0 amplifiers  
require that pin #9 be removed from the remote mounting  
interconnect cable.  
Amplifier damage may result from use of cable that has pin  
#9 connections present.  
Description of Encode Signals  
encode 1  
encode 2  
Bridge mode & power detect  
Temperature, channel 1  
encode 3  
encode 4  
Standby mode detect  
Temperature, channel 2  
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Section 5: Appendix- RS-232 Port Pinout & Connector P-Ns  
RS-232 PINOUT: The diagram below shows the pin assignments for the RS-232 connector on the DSP-3.  
Note that Pin #9 is used for Contact Closure function (normally not used in RS-232).  
Pin  
Signal Description  
1
2
3
4
5
6
7
8
9
DCD  
TD  
RD  
DTR  
Signal GND  
DSR  
RTS  
CTS  
contact closure  
TERMINAL BLOCK CONNECTOR PART NUMBER REFERENCE- The following manufacturers and part numbers are provided  
as a reference to users. The information here is subject to change without the knowledge of QSC.  
3 pin without integral strain relief: Phoenix Contact - 17 57 02 2; Riacon - 31249103-6; On Shore Tech - EDZ950/3  
3 pin WITH Strain Relief : Phoenix Contact 17 76 16 8  
Phoenix Contactis the trademark of Phoenix Contact, Inc., Middletown, PA  
Riaconis the trademark of RIA electronic, Inc., Eatontown, NJ  
On-Shore Technologyis the trademark of On-Shore Technology, Inc., Tempe, AZ  
All other trademarks are the property of their respective owners  
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Section 5: Appendix- Application Information  
APPLICATION INFORMATION  
As design improvements are continuous, the following information is subject to change. Contact QSC for current information.  
QSC’sDSP-3ModulehasbeendesignedtoattachdirectlytotheDataPortconnectorofQSC’sCX,DCA,Powerlight,andPowerlight  
2 series amplifiers. When attached to CX, DCA, and Powerlight 2 amps manufactured 08/99 and later, the module receives its  
power through the DataPort from the amplifier. Modules connected to earlier models of those just mentioned and all Powerlight  
amplifiers (the “non-2’s”) require an external DC supply (available from QSC).  
TO CLARIFY- CX, DCA, and PL2 amps made prior to August 1999 DO NOT provide adequate power supply voltage to  
the module, requiring the use of the same type of external DC supply as used with Powerlight amplifiers. The amps in  
question will have a serial number PRIOR to 0899XXXXX, where the first four digits of the serial number are the MMYY datecode.  
Again, the modules WILL work with these amps just fine, but will require the use of our external power supply.  
Full feature set, Direct-mounting, No external power or special interconnect cables required for the following QSC  
power amplifiers with serial numbers of 0899XXXXX and later, where the first four digits of the serial number are the MMYY datecode :  
CX series:  
CX302 - CX1202V (all)  
DCA series:  
PL2 series:  
PL2A series:  
DCA1222, DCA1622, DCA2422, DCA3022, DCA342  
PL224, PL230, PL236, PL218  
All  
Remote Mounting Required, QSC DataPort Cable required: Full feature-set, no external power required.  
CX series:  
DCA series:  
CX204V, CX254, CX404  
DCA1644, DCA1824  
Remote Mounting, QSC DataPort Cable and External Power required: Full feature-set.  
Powerlight series:  
PL1.0 through PL4.0 (all)  
PL6.0 and PL9.0 require modified DataPort cable between DSP-3 and amplifier.  
Powerlight 6.0 and 9.0 MUST have  
pin#9removedfromtheAmplifier-to-  
DSP DataPort Cable before use!  
RemoteMountingandExternalPowerrequired.NoDataPortConnectionpossible,PowerLimitingnotavailable.  
ISA series:  
MX series:  
PLX series:  
RMX series  
USA series:  
The ISA amplifiers have a “V2” DataPort that may be used for audio inputs only.  
All  
All  
All  
All  
ALL non-QSC amplifiers are can be used with the DSP-3.  
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Section 5: Appendix- Preset Operation Notes  
SPECIAL INFORMATION CONCERNING SAVED DSP-3 CONFIGURATIONS  
The computer which is used to create the DSP-3 signal flow configurations, and subsequently save them to disk,  
should be the same computer used to modify and adjust the DSP-3 settings in the future. Naturally, this might not  
always be the case. At the least, a copy of the DSP-3 configuration(s) should be saved to floppy disk, so the  
configuration files can be transferred to whatever computer(s) might be used to adjust or modify the DSP-3  
module settings in the future.  
The reason:  
The Signal Manager software works in conjunction with the DSP-3 module to  
create specific signal processing algorithms for filters, delays, limiters, and the like. The algorithms are displayed on the  
computer screen as ”configuration files”, with graphical representations of each function and parameters. The user creates a  
signal chain, “wiring” together blocks of functions as needed for each particular audio channel or channels.  
When you build a DSP-3 configuration from scratch, or load one from disk, and perform an “Apply to DSP” operation, the  
information downloaded into the DSP-3 module is NOT the graphical representation of what is displayed on the screen. The  
downloaded information consists of the compiled algorithm coefficients of the functions, i.e. “just the math”. If building a new  
configuration from scratch, when you apply it to the DSP-3 you will also be prompted to save it to disk as a Configuration file.  
The path for this Configuration file is then associated with the compiled information that is applied to the DSP-3. A previously  
saved(todisk)configurationfilemayalsobeappliedtotheDSP-3, andthatparticularfilepathisassociatedwiththealgorithms  
now loaded in the DSP-3.  
When you connect a DSP-3 to a computer, the Signal Manager software first attempts to locate and display the configuration  
file that has been associated with the algorithm coefficients currently running in the DSP-3, to correlate “what you hear” with  
“what you see”. This would allow you to further adjust a delay or a filter parameter, for instance. If the correct file is located,  
based on the associated path name, the graphical configuration is displayed. If the file is not found (the file has been renamed,  
moved,deleted,oryouarenotusingthesamecomputeronwhichtheDSP-3wasoriginallyconfigured)thecomputerwilldisplay  
a message asking if you would like to load the Default configuration.  
Answering YES will load the Default (factory) configuration TO THE SCREEN, but will not apply it to the DSP-3. Answering NO  
will merely display a blank workspace to the screen with no configuration loaded. At this point, what is displayed is NOT what  
is currently running in the DSP-3 memory.  
IFYOUPERFORMANAPPLYTODSPNOWYOUWILLOVERWRITEWHATEVERISCURRENTLYRUNNINGINTHEDSP-3! This  
is likely NOT what you want to do. Instead, locate the desired configuration file (from an alternate path or from floppy) using  
the Configuration->Open menu (Ctrl-O).  
When the proper configuration file is displayed on the screen, go to the Configuration->Edit menu (Ctrl-E), followed by an Apply  
to DSP command (Ctrl-D). This will download the currently displayed configuration back into the DSP-3 (overwriting itself),  
allowing synchronization of what is displayed with what is running in the DSP-3. At this point, you may adjust parameters or  
modify settings as usual.  
QSC engineers are currently developing an improvement to this process, in which the computer would always be capable of  
displaying the currently running configuration, regardless of the location of the configuration file (or lack of the file).  
33  
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Section 6: Maintenance, Warranty & QSC Contact Information  
Disclaimer  
Cleaning  
QSC Audio Products, Inc. is not liable for any damage to speakers,  
amplifiers, or any other equipment that is caused by negligence or  
improper installation and/or use of the DSP-3 digital signal proces-  
sor.Duetotheinherentcomplexityofthecommunicationsbetween  
the DSP-3 and the host computer, QSC Audio Products, Inc. is not  
liableforanydirectorindirectdamagecausedbycomputercommu-  
nications failure.  
The faceplate and chassis can be cleaned with a soft cloth and  
nonabrasive, mild cleaning solution. Products like Simple Green  
andWindexworkwell.Donotusepowdersorscrubbingpadsofany  
type as they are usually abrasive and will permanently damage the  
finish of your DSP-3. Dampen a soft, lint-free cloth with the  
cleaning solution and wipe the DSP-3 down gently. Insure that  
cleaning solution does not get down into the connectors. Do not  
spray the solution directly onto the DSP-3 as it will penetrate into  
the connectors.  
Product Warranty  
QSC guarantees the DSP-3 to be free from defective material and/  
orworkmanshipforaperiodofthreeyearsfromthedateofsale,and  
will replace defective parts and repair malfunctioning products  
under this warranty when the defect occurs under normal installa-  
tion and use—provided the unit is returned to our factory via  
prepaid transportation with a copy of the proof of purchase, i.e.,  
sales receipt. This warranty provides that examination of the  
returned product must indicate, in our judgment, a manufacturing  
defect. This warranty does not extend to any product which has  
been subjected to misuse, neglect, accident, improper installation,  
or where the serial number and date code have been removed or  
defaced.  
User Maintenance  
There is no user-level maintenance on the DSP-3. Contact QSC’s  
Technical Services Department if service is required.  
Warranty Information  
If the DSP-3 isn’t working properly, please verify that a  
known good 9-pin serial cable is used between the DSP-3  
and the computer. If proper operation can not be restored,  
the DSP-3 may require service. This must be performed by  
qualified service personnel. To obtain the location of you  
nearest QSC Authorized Service Center, please contact you  
QSC dealer or contact QSC’s Technical Services Depart-  
ment.  
If the DSP-3 is returned to the factory for service, it should be sent  
in the proper QSC carton. If you did not save the original carton, ask  
your QSC dealer for one or call QSC to have one sent to you. This  
warranty does not cover shipping damage caused by improper  
packing or the use of improper shipping cartons.  
FACSIMILE (FAX) NUMBERS:  
WORLD WIDE WEB:  
Sales & Marketing FAX  
Technical Services FAX  
ADDRESS:  
(714) 754-6174  
(714) 754-6173  
TELEPHONE NUMBERS:  
Main Number  
(714) 754-6175  
QSC Audio Products, Inc.  
1675 MacArthur Boulevard  
Sales Direct Line (714) 957-7100  
or (800) 854-4079 toll free (U.S.A. only)  
Costa Mesa, CA 92626-1468 USA  
Technical Services (714) 957-7150  
or (800) 772-2834 toll free (U.S.A. only)  
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1675 MacArthur Boulevard Costa Mesa, California 92626 USA PH: (714) 754-6175 FAX: (714) 754-6174  
© Copyright 2001, QSC Audio Products, Inc.  
QSC® is a registered trademark of QSC Audio Products, Inc., Costa Mesa, CA  
QSCand the QSC logo are registered with the U.S. Patent and Trademark Office  
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