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.
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.
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.
Each channel includes:
• Crossover filtering
• Compression and limiting
• Multiple Parametric EQs
• Precision attenuation
• Shelf filtering
• Mixing
• Multiple Delays (up to 910 ms)
• Tone and noise generation
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.
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.
Save space and weight by
mounting the DSP-4 onto the
back of most 2-channel DataPort
equipped QSC amplifiers. Or
use multiple DSP-4s as a standalone,rack-mounted DSP solution.
DSP-4
Signal Processing Functions and Additional Features
Multiple Parametric Filters, assignable anywhere in the signal chain:
Variable Frequency Bypass all EQs
Variable Gain Add EQ
Variable Q Delete EQ
Bypass one EQ Show Response
Multiple Delays, assignable anywhere in the signal chain:
20.83 µsec incremental
910 msec maximum (total of all delays)
Compressor, assignable anywhere in the signal chain:
Gain Release Time
Threshold Show Response
Ratio Bypass
Attack Time
Output Peak Limiter, assignable anywhere in the signal chain:
Gain Release Time
Threshold Show Response
Attack Time Bypass
High and Low-Pass Crossover Filters, assignable anywhere in the
signal chain:
Butterworth 6, 12, 18, 24 dB per octave slope
Bessel 6, 12, 18, 24 dB per octave slope
Linkwitz-Riley 12 and 24 dB per octave slope
Bypass one EQ Delete EQ
Bypass all EQ’s Show Response
Add EQ Cutoff Frequency
High and Low-Pass Shelf Filters, assignable anywhere in the
signal chain:
Variable Corner Frequency Bypass all EQs
Variable Gain Add EQ
Variable Q Delete EQ
Bypass one EQ Show Response
Signal Mute
Attenuation 0.1 dB steps
Mix Post Crossover Audio (2➞1 Mixer)
Signal Splitter
Built-in Noise Generator (Pink & White)
Built-in Variable Frequency Tone Generator
Signal Polarity Reversal
Frequency Response
Clip and Protect Indication of the amplifier’s output
Hardware
Two independent channels of DSP
48 kHz, 24-bit converters
No turn on pops or “zipper” noise
If the memory or hardware fails, unit turns on muted to prevent
driver damage
Host interface via RS-232 or QSControl Audio Network System via
CM16a Amplifier Network Monitor
Electronically balanced XLR inputs
Contact closure to trigger preset changes
Post DSP output signal for daisy chaining
Selectable input sensitivity: 1.5, 4, 9, 18 Vrms; 6, 14.5, 21.5, 27.5
3.5, 12, 19, 25 dBV
Output signal gain
Software
“Drag-and-drop” configuration software
DSP processing power and memory is dynamically assigned to signal
processing functions — eliminating the limitations imposed by fixed
signal chain designs
Graphical representation of DSP resources
Firmware upgrades via RS-232
Hard copy printout of signal flow layout or parameter settings
System Requirements
®
Windows
SVGA monitor at 800 x 600 (min.); 1024 x 768 recommended
CD-ROM drive
32 MB RAM (min.)
10 MB free hard disk space (min.)
Available RS-232 COM port
Male to female 9-pin serial cable (for programming)
* Windows Me not supported
98, NT4 (SP6), and 2000 (SP1)*
dBu;
Predictive Delay Feature — produces less signal distortion than analog
compressor/limiters — especially for fast attack times
Configurations
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.
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 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.
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 • ISA
• Two-channel DCA Series
• PowerLight 2 Series
The following models require a Remote Rack Mounting Bracket:
Full Feature (DPX-2 cable required) Reduced Feature Set
• 4-channel CX Series • MX • Non-QSC amplifiers
• 4-channel DCA Series • USA
• PowerLight Series • PLX
• 8-channel CX Series • RMX
(V2 DataPort – audio only;
requires external power supply)
DSP-4
Audio Converters 24 bit, 48 kHz
Frequency Response 3 dB below full scale input voltage
XLR Output 20 Hz -10 kHz, ± 0.3 dB / 20 Hz - 20 kHz, ± 0.7 dB
DataPort 20 Hz - 20 kHz, ± 0.2 dB
Distortion < 0.02% THD+N at +4 dBu
Throughput Delay 1.00 milliseconds (A/D – DSP – D/A)
Dynamic Range > 104 dB, 20 Hz to 20 kHz, 1.5V sensitivity, unweighted
AES-17 -60 dB Method > 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
Input Impedance 8.3k ohm balanced / 3.7k ohm unbalanced
Commom Mode Rejection > 50 dB minimum, 20 Hz – 20 kHz | > 60 dB typical, 20 Hz – 20 kHz
Input Sensitivity (selectable) 1.5, 4, 9, 18 Vrms | 6, 14.5, 21.5, 27.5 dBu | 3.5, 12, 19, 25 dBV
Crosstalk (inter-channel within DataPort pair) > 62 dB separation, 20 Hz - 20 kHz
Audio Input Connectors Two XLR female (1 for each audio channel) | One HD-15 female DataPort* | One RS-232 female (PC input)
Audio Output Connectors Two XLR male (for daisy-chaining each audio channel out)
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 > 1.9k ohms
thresholds with 9V DC max input
External Power Requirements 15 VDC, 0.3 A
(DPX-1 recommended) Required only for PowerLight®, QSC non-DataPort amplifiers, or non-QSC amplifiers
DImensions (HWD) 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)
Weight - Net / Shipping 0.93 lbs (0.42 kg) / 1.3 lb (0.59 kg)
Construction 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.
Specifications
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
DSP-4 Spec Sheet - 02/21/06
qscaudio.com
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