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DSP-4
 DSP-4 (Digital Signal Processing)
With more than three decades of experience pioneering cutting edge audio products, QSC raises the bar once again with the DSP-4 Digital Signal Processing Module. 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.
If you would like to purchase a DSP-4 module, please call our sales department at: 800-854-4079.
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, time delay, or subsonic filters, the DSP-4 is as flexible as your system’s needs.
Each channel includes:
- Crossover filtering
- Multiple parametric EQs
- Shelf filtering
- Tone and noise generation
- Precision attenuation
- Multiple delays (up to 910 ms)
- Mixing
- Compression and limiting
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.
| DSP-4 FEATURES |
| Hardware |
- Two independent channels of DSP
- 48kHz, 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
- Peak and RMS meter displays with clip indication
- DataPort pass-through compatible with QSControl
- Selectable input sensitivity: 1.5, 4, 9, 18 Vrms;
6, 14.5, 21.5, 27.5 dBu; 3.5, 12, 19, 25 dBV
- Output signal gain (to be released)
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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
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| System Requirements |
- Windows® 98, NT4 (SP6), and 2000 (SP1)*
- SVGA monitor @ 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
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| DSP-4 FUNCTIONS |
Multiple Parametric Filters, assignable anywhere in the signal chain:Variable Frequency
Variable Gain
Variable Q
Bypass (one EQ Band)
Bypass all EQs
Add EQ
Delete EQ
Show Response |
Multiple Delays, assignable anywhere in the signal chain910 msec Maximum
20.83 μsec Incremental |
Dynamics processor with Compressor assignable anywhere in the signal chain: Gain
Threshold
Ratio
Attack Time
Release Time
Show Response
Bypass |
Output Peak Limiter, assignable anywhere in the signal chain:Gain
Threshold
Attack Time
Release Time
Show Response
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 Band)
Bypass all EQs
Add EQ
Delete EQ
Show Response |
High and Low-Pass Shelf Filters, assignable anywhere in the signal chain:
Variable Corner Frequency
Variable Gain
Variable Q
Bypass (one EQ Band)
Bypass all EQs
Add EQ
Delete EQ
Show Response |
| Signal Mute |
| Attenuation: 0.1 dB steps |
| Mix Audio (2 to 1 Mixer) |
| Signal Splitter |
| Built-in Noise Generator (Pink & White) |
| Built-in Variable Frequency Tone Generator |
| Signal Polarity Reversal |
| RMS and Peak Metering with Clip Indication |
| Add or delete up to 7 additional bands of "EQ" per filter block |
| Visual editing of composite filter response, using cursor controls in graphical display |
| Individual or group bypass of EQ bands per filter block |
| "Predictive Delay" feature- produces less signal distortion than analog compressor/limiters-especially for fast attack times |
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DSP-4 SPECIFICATIONS |
Frequency Response
XLR Output
3 dB below full scale input voltage |
20 Hz to 10 kHz ± 0.3 dB
20 Hz to 20 kHz ± 0.7 dB |
| Distortion |
<0.02% THD+N @ +4 dBu |
| Dynamic Range Unweighted |
>104 dB 20 Hz to 20 kHz, 1.5V sensitivity, unweighted
>106 dB 20 Hz to 20 kHz, all other sensitivies, unweighted
>106 dB 20 Hz to 20 kHz, 1.5V sensitivity, A weighted
>108 dB 20 Hz to 20 kHz, all other sensitivies, A weighted |
| Common-mode Rejection |
>50 dB minimum 20 Hz to 20 kHz
>60 dB typical 20 Hz to 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 |
| Output Sensitivity |
4, 6 Vrms
14.5, 18 dBu
12, 15.5 dBV |
| Crosstalk (inter-channel w/in DataPort pair) |
>62 dB separation, 20 Hz to 20 kHz
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| Input Connectors |
Two XLR female (1 for each audio channel)
One HD-15 female DataPort*
One RS-232 female (PC input)
One Power Jack (Required only for PowerLight, QSC non-DataPort amplifiers, or non-QSC amplifiers, using remote rack mounting bracket) |
| Output Connectors |
Two XLR male (for daisy-chaining each audio channel out)
One HD-15, male amplifier connection |
| Indicators |
Front: Power (one blue) Signal (one green) |
External Power Requirements
(DPX-1 recommended) |
15 VDC, 0.4 A
Required only for PowerLight, QSC non-DataPort amplifiers, V2 DataPort (audio only) models, or non-QSC amplifiers. |
| Dimensions |
3.5" height
3.75" width
1.38" depth |
| Weight |
.93 lbs net, 1 lb shipping |
| 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. |
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| Compatible Amplifier Models |
The DSP-4 mounts directly to the back of these models via the DataPort:
Full Feature:
- Two-channel CX Series
- Two-channel DCA Series
- PowerLight 2 Series
- ISA Series (Version 2 DataPort--audio only; requires external power supply)
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The following models require a Remote Rack Mounting Bracket: 
(Download the DPX-4 specs in PDF format here.)
Full Feature (DPX-2 cable required)
- Four-channel CX Series
- Four-channel DCA Series
- PowerLight Series
Reduced Feature Set
- MX
- USA
- PLX
- RMX
- Non-QSC amplifiers
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DIGITAL SIGNAL PROCESSORS
DOCUMENTS
User Manual (PDF 1.1MB)
DSP-4 Specifications (PDF 396K)
HI-RES IMAGES
DSP-4
RESOURCES
DSP FAQ (Frequently Asked Questions)
DSP Voicings
SOFTWARE
SIGNAL MANAGER SOFTWARE
ACCESSORIES
DPX-1 External Power Supply
When a DSP-4 is mounted outboard with a DPX-4 Rack Mount Bracket, or directly on an amplifier where external voltage is necessary. (FG-000306-00)
DPX-2 DataPort Cable
Used when the DSP-4 is mounted outboard. (SG-000301-00)
DPX-4 Rack Mount Bracket
Allows remote outboard mounting of the DSP-4. (SG-000303-00)
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