1600 Watt Peak 2-Channel Power Amplifier with DSP


The QSC GXD4 2-channel power amplifier is ideal for entertainment and production applications requiring performance and the convenience of integral signal processing. The hallmarks of the QSC brand – professional audio quality, engineering and manufacturing focused on long-term reliability - are all intrinsic to the GXD4. Add contemporary styling, multiple routing options, light weight, digital signal processing and advanced protection circuitry, and the GXD4 clearly represents real value.

The GXD4 is optimized for use with 8 and 4 ohm loudspeaker loads, and delivers just the right amount of power to the most popular speakers used by entertainers and production professionals.

The GXD4 also brings full-function loudspeaker processing capability to a new price point with all the processing necessary to get the most from a loudspeaker system. The DSP section includes High and Low-Pass filters (24dB LR), 4-band parametric equalizer, signal alignment delay, and RMS/Peak speaker protection limiting. Twenty presets for selected typical systems - provided as generic “starting points” - are included.

The most common cause of loudspeaker failure is amplifier clipping. The digital limiter used in the GXD4 is set to prevent the amplifier from being driven into clipping while delivering the maximum usable output. In addition to amplifier limiting it also provides smart speaker protection by simply setting the loudspeaker’s continuous power and impedance (4 Ohm and 8 Ohm), and selecting whether Mild, Medium or Agressive protection is desired.

QSC GXD4 Features:

  • High peak output power of 1600 Watts
  • Power levels matched to the most popular loudspeakers and optimized for maximum real-world headroom into 4 Ohm and 8 Ohm speaker systems.
  • Class-D output stage with a universal power supply for high performance and efficiency.
  • Extensive and powerful loudspeaker processing built in.
    • Includes High & Low-Pass filters, 4-band PEQ, Limiting, and Delay.
  • Large LCD display simplifies amplifier setup and indicates amp status.
  • Precision rotary encoders for gain and DSP parameter control.
  • Inputs:  Parallel XLR and 1/4” TRS connectors for compatibility with any source while providing convenient loop-thru capability.
  • Outputs:  Professional binding post and NL4 connectors (compatible with NL2) provide for mono and bi-amp speaker connections.
  • Digital Limiting automatically protects the amplifier from damage due to temperature rise or overdrive.
  • Adjustable speaker protection to match your loudspeaker’s power and impedance.
  • Front panel LEDs indicate signal presence, input overload, and amplifier clipping.

QSC GXD4 Specifications:

  • Stereo Mode - Watts Per Channel:
    • 8 Ohm Peak, Both Channels Driven:  600 Watts
    • 4 Ohm Peak, Both Channels Driven:  800 Watts
    • 8 Ohm Continuous, Both Channels Driven:  400 Watts
    • 4 Ohm Continuous, Both Channels Driven:  600 Watts
  • Distortion (typical, 1 kHz at full rated power): < 1% THD
  • Signal-to-Noise Ratio (A-weighted, 20 Hz - 20kHz):  100 dB
  • Input Sensitivity:  1.2 Vrms, 3.9 Vrms
  • Voltage Gain (8 Ohms):  33.5 dB
  • Output Circuitry:  Class D
  • Power Requirements - 1/8 Power at 4 Ohms:
    • 100 VAC:  3.4 Amps
    • 120 VAC:  2.9 Amps
    • 230 VAC:  1.6 Amps
  • Frequency Response:  20 Hz - 20 kHz, +0.7 dB,-0.8 dB
  • Dynamic Headroom (4 Ohms):  1.25 dB
  • Damping Factor:  100
  • Input Impedance: 
    • 20 kOhms (balanced)
    • 10 kOhms(unbalanced)
  • Maximum Input Level:  +23.5 dBu
  • Input Connectors (each channel):  3-pin XLRF /1/4" TRS, balanced
  • Output Connectors (each channel):  NL4 (Channel 1- 1+/-, Channel 2 - 2+/-), binding posts
  • Amplifier and Load Protection: 
    • Short circuit
    • Open circuit
    • Thermal
    • RF protection
    • Load protected against DC faults
  • Front Panel Controls and Indicators:
    • 2x Rotary Encoders
    • 3x Operational Buttons (HOME, ENTER, EXIT)
    • 2x Green Signal LEDs, indicates signal presence
    • 2x Red A/D Clip LEDs, indicate input over-drive and/or amplifier current clipping
    • Blue Power LED ring, AC on
    • 2.12" x 1.0", 256 x 128 pixel LCD panel
  • DSP Functions:
    • High Pass Filter, 4th order LR, adjustable Frequency 20 Hz to 4 kHz
    • Low Pass Filter, 4th order LR, adjustable Frequency 60 Hz to 4 kHz
    • 4-band PEQ, with variable Frequency, Gain, and Bandwidth
    • Peak Limiter, with Power, Aggressiveness, and Impedance selection
    • Delay 50 msec max.
  • Dimensions (HxWxD):  3.5" (2RU) x 19" x 10.2"(89mm x 483mm x 259mm)
  • Weight:  11.3 lbs (5.1 kg)
  • Agency Approvals:  UL, CE, RoHS/WEEE Compliant
  • Carton and Contents:  Power cable and quick start guide
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