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)
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® 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
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.