QSC Audio Thermometer DSP 4 User Guide

DSP-4  
Digital Signal Processor  
This compact module offers two channels of independent DSP and  
attaches to the back of most 2-channel DataPort equipped QSC  
amplifiers—without occupying any additional rack space.  
Configurable  
The DSP-4’s processing horsepower is dynamically assignable so you  
are not limited by a fixed signal chain. Simply use QSC’s powerful PC-  
based Signal Manager software to easily configure multiple processing  
functions and signal flow with “drag-and-drop” tools.  
Capitalizing on the success of our DSP-3, the second-generation  
DSP-4 provides several enhancements in functionality and  
performance while also incorporating the universally popular  
XLR balanced connectors. These enhancements include new  
A/D and D/A converters for improved signal-to-noise performance  
and upgraded software that significantly increases the unit’s  
operational characteristics.  
Cost-effective  
The power and flexibility of the DSP-4 eliminates the need for  
expensive outboard processing gear, reducing cost and installation time  
for almost any application. The compact DSP-4 also plugs directly into  
the back of most QSC DataPort-equipped amplifiers for use in systems  
where rack space is a premium.  
Powerful  
Simple to install, compact, and featuring “set-and-forget” convenience,  
the DSP-4’s powerful processor enables you to perform a wide range of  
signal processing functions; and with its new A/D and D/A converters,  
its noise floor improves. Whether you need speaker crossovers,  
EQ, signal delay, or infrasonic filters, the DSP-4 is as flexible as your  
system’s needs.  
Save space and weight by  
Each channel includes:  
mounting the DSP-4 onto the  
back of most 2-channel DataPort  
equipped QSC amplifiers. Or  
use multiple DSP-4s as a stand-  
alone,rack-mounted DSP solution.  
• Crossover filtering  
• Shelf filtering  
• Compression and limiting  
• Multiple Parametric EQs  
• Precision attenuation  
• Mixing  
• Multiple Delays (up to 910 ms)  
Tone and noise generation  
 
Configurations  
The DSP is configured with an  
easy-to-use software interface.  
Signal processing icons from the  
toolbar are dropped onto the  
workspace and the signal path is  
routed with simple drawing tools.  
Signal Manager  
Advanced “Drag and Drop” Software Configuration  
DSP configuration is made simple with a PC-based “drag-  
and-drop” software program called Signal Manager. Users  
can access a DSP “toolbox” and simple drawing tools  
to configure processing functions and signal flow. DSP  
processing power and memory is dynamically assigned  
to signal processing functions and any combination of  
functions may be configured until the total capacity is used.  
DSP resources are graphically displayed at the bottom of  
the screen.  
Compatible Amplifier Models  
The DSP-4 mounts directly to the back of these models via the DataPort:  
Full Feature  
Version 2 DataPort  
• Two-channel CX Series  
• Two-channel DCA Series  
• PowerLight 2 Series  
• ISA (V2 DataPort – audio only;  
requires external power supply)  
Configurations can be downloaded directly to the DSP-4  
via an RS-232 serial port or through a QSControl Audio  
Network System via a CM16a Amplifier Network Monitor for  
added simplicity. The software package also offers real-time  
control and set-and-forget convenience. Configurations can  
be saved and recalled for future use.  
The following models require a Remote Rack Mounting Bracket:  
Full Feature (DPX-2 cable required)  
• 4-channel CX Series  
Reduced Feature Set  
• MX  
• Non-QSC amplifiers  
• 4-channel DCA Series  
• PowerLight Series  
• USA  
• PLX  
• RMX  
• 8-channel CX Series  
 
Specifications  
DSP-4  
Audio Converters  
Frequency Response  
XLR Output  
24 bit, 48 kHz  
3 dB below full scale input voltage  
20 Hz -10 kHz, 0.3 dB / 20 Hz - 20 kHz, 0.7 dB  
20 Hz - 20 kHz, 0.2 dB  
DataPort  
Distortion  
< 0.02% THD+N at +4 dBu  
Throughput Delay  
Dynamic Range  
AES-17 -60 dB Method  
1.00 milliseconds (A/D – DSP – D/A)  
> 104 dB, 20 Hz to 20 kHz, 1.5V sensitivity, unweighted  
> 106 dB, 20 Hz to 20 kHz, all other sensitivities, unweighted  
> 107 dB, 20 Hz to 20 kHz, 1.5V sensitivity, A weighted  
> 109 dB, 20 Hz to 20 kHz, all other sensitivities, A weighted  
8.3k ohm balanced / 3.7k ohm unbalanced  
> 50 dB minimum, 20 Hz – 20 kHz | > 60 dB typical, 20 Hz – 20 kHz  
1.5, 4, 9, 18 Vrms | 6, 14.5, 21.5, 27.5 dBu | 3.5, 12, 19, 25 dBV  
> 62 dB separation, 20 Hz - 20 kHz  
Input Impedance  
Commom Mode Rejection  
Input Sensitivity (selectable)  
Crosstalk (inter-channel within DataPort pair)  
Audio Input Connectors  
Two XLR female (1 for each audio channel) | One HD-15 female DataPort* | One RS-232 female (PC input)  
Two XLR male (for daisy-chaining each audio channel out)  
Audio Output Connectors  
One HD-15 male DataPort amplifier connection  
Indicators  
Front: Power (one blue) | Signal (one green)  
Contact Closure Inout  
Inputs  
1 discrete input (pin #9 of RS-232 port)  
Configuration  
Single-ended input, pull LOW (to GND, pin5) for closure detect  
Resistance for closure detect  
< 150Ω  
Resistance for open detect TTL compatible  
thresholds with 9V DC max input  
> 1.9k ohms  
External Power Requirements  
(DPX-1 recommended)  
15 VDC, 0.3 A  
Required only for PowerLight®, QSC non-DataPort amplifiers, or non-QSC amplifiers  
DImensions (HWD)  
Weight - Net / Shipping  
Construction  
3.47" (8.81 cm) x 3.35" (8.51 cm) without flanges / 3.75" (9.52 cm) with flanges x 2.05" (5.21 cm)  
0.93 lbs (0.42 kg) / 1.3 lb (0.59 kg)  
Steel chassis and back cover  
*DataPort input for use with CM16a Amplifier Network Monitor in QSControl audio network systems for remote management of QSC amplifiers and other audio devices  
PowerLight is a registered trademart of QSC Audio Products Inc.  
A remote rack mounting bracket (the DPX-4) is available to use with PowerLight, 4-channel QSC amplifiers, or for non  
DataPort equipped amplifiers. Designed to be bolted to the rear of an amplifier rack, up to four modules can be mounted  
to each panel, providing up to eight channels of DSP processing in a three rack unit space.  
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174  
qscaudio.com  
DSP-4 Spec Sheet - 02/21/06  
 

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