QSC DSP4

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)

Specifications:

• 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)