Digital Signal Processing Module for QSC Amplifiers


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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.

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

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.

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.

Hardware Features:

  • 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 Features:

  • "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)


  • 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, AES-17 -60dB Method:
        > 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
  • Input Impedance: 8.3k ohm balanced / 3.7k ohm unbalanced
  • Common 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)
  • External Power Requirements: 15 VDC, 0.3 A; Required only for PowerLight®, QSC non-DataPort amplifiers, or non-QSC amplifiers
  • Construction: Steel chassis and back cover
  • Dimensions (H x W x D): 3.47" x 3.35" x 2.05" (8.81 x 8.51 x 5.21 cm)
  • Weight: 0.93 lbs. (0.42 kg)
Remote Rack Mounting Bracket for DSP-3 & DSP-4QSC DPX4 Remote Rack Mounting Bracket for DSP-3 & DSP-4

The DPX-4 allows remote rack mounting of QSC DataPort-compatible accessory modules such as the DSP-3 and DSP-4 digital signal processors. The bracket allows accessory modules to be used in a standalone configuration with QSC four-channel, ...

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Power Supply for DSP3 QSC DPX1 Power Supply for DSP3

This external power supply is used for the DSP-3 Digital Signal Processor under special circumstances.When a DSP-3 is mounted out-board with a DPX-4 Rack Mount Bracket, or directly on an amplifier where external voltage is necessary, this ...

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Our Price:$60.00

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