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
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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
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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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