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QSC Audio GXD4 Professional Power Amp - 2 x 400W at 8 Ohms



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Product Description

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GXD Series amplifiers are ideal for all kinds of music and production applications when you need great performance and the convenience of integral signal processing and the GXD4 is a great, reliable unit at a very affordable price. The hallmarks of the QSC brand – professional audio quality, engineering and manufacturing focused on long-term reliability - are all intrinsic to the GXD. With contemporary styling, multiple routing options, a light weight construction, digital signal processing and advanced protection circuitry, and the GXD Series clearly represents real value – something everyone can use.

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

The GXD amplifiers are unlike other amps in this category that provide little more than a front panel screen to control the same functions that have been under rear-panel, DIP switch control for decades. 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 are provided as generic “starting points” are included.

The most common cause of loudspeaker failure is amplifier clipping. The digital limiter used in the GXD amplifiers 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 and 8), and selecting whether Mild, Medium or Aggressive protection is desired.

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Key Features

  • Extensive and powerful loudspeaker processing built in. Includes high and low-pass filters, 4-band parameteric EQ, limiting, and delay.
  • Large LCD display simplifies amplifier setup and indicates amp status. Just right for
  • Inputs: Parallel XLR and 1/4” TRS connectors for compatibility with any source while providing convenient loop-thru capability.
  • Precision rotary encoders for gain and DSP parameter control.
  • 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.


  • 8 dynamic, both channels driven 600 watts
  • 4 dynamic, both channels driven 800 watts
  • 8 continuous, both channels driven 400 watts
  • 4 continuous, both channels driven 600 watts
  • Distortion (typical) < 1% THD
  • 1 kHz at full rated power 
  • Signal to Noise (A weighted, 20 Hz–20 kHz) 100 dB
  • Input Sensitivity 1.2 Vrms, 3.9 Vrms
  • Maximum Voltage Gain 33.5 dB
  • Output Circuitry Class D
  • - 100 V AC 3.4 A
  • - 120 V AC 2.9 A
  • - 230 V AC 1.6 A
  • Frequency Response (20 Hz–20 kHz) +0.7 dB, -0.8 dB
  • Dynamic Headroom (4) 1.25 dB
  • Damping Factor (8) 100
  • Input Impedance 20 k (balanced), 10 k (unbalanced)
  • Maximum Input Level +23.5 dBu
  • Input Connectors (each channel) 3-pin XLR/F / 1/4" TRS, balanced
  • Output Connectors (each channel) NL4, binding posts
  •  NL4 pinout:
  •  Channel A on 1+, 1-; Channel B on 2+, 2-
  •  Channel B on 1+, 1- 
  • Amplifier and Load Protection Short circuit, open circuit, thermal, RF protection
  •  Load protected against DC faults
  • Front Panel Controls and Indicators 2 × Rotary Encoders
  •  3 × Operational buttons (HOME, ENTER, EXIT)
  •  2 × Green Signal LEDs indicate signal presence
  •  2 × Red A/D Clip LEDs indicate input over-drive and/or amplifier current clipping
  •  Blue Power LED ring indicates AC on
  •  2.12" × 1.0", 256 × 128 pixel LCD
  • DSP Functions High-pass filter, 4th-order Linkwitz-Riley, adjustable frequency 20 Hz to 4 kHz
  •  Low-pass filter, 4th-order Linkwitz-Riley, adjustable frequency 60 Hz to 4 kHz
  •  4-band parametric EQ with variable frequency, gain, and bandwidth
  •  Peak limiter with power, aggressiveness, and impedance selection
  •  Delay 50 msec max.
  • Dimensions (HWD) 3.5" (2 RU) × 19" × 10.2" (89 mm × 483 mm × 259 mm)
  • Weight (Net) 11.3 lb (5.1 kg)
  • Weight - Shipping 15.4 lb (7.0 kg)
  • Agency Approvals UL, CE, RoHS/WEEE compliant
  • Carton and Contents Power cable and quick start guide

Written by Anna Colombo

QSC Audio

Customer Reviews


3 reviews





Trusted Customer7th Feb 2023

Simple to install. Works well, although it’s predecessor failed after 5 years use.

Value 4Looks 4Durability 3Sound 4

Trusted Customer28th Jun 2022

A fine piece of superior kit.

Value 3Looks 5Durability 4Sound 5


I bought this amp based on its brand reputation, resources, and technical specifications. On my hand, it looks and sounds as good as it is described.

Value 5Looks 5Durability 5Sound 5

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Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.