QSC GXD4 Lightweight, class-D professional power amplifier with DSP, 2 channels, 400 watts/ch at 8Ω, 600 watts/ch at 4Ω, total power capacity of 1600 watts

Vendor: QSC
Description QSC GXD4 Lightweight, class-D professional power amplifier with DSP, 2 channels, 400 watts/ch at 8Ω, 600 watts/ch at 4Ω, total power capacity of 1600 watts The GXD amplifiers is a part of the E...
$549.99 $689.99

QSC GXD4 Lightweight, class-D professional power amplifier with DSP, 2 channels, 400 watts/ch at 8Ω, 600 watts/ch at 4Ω, total power capacity of 1600 watts

The GXD amplifiers is a part of the E Series Entertainment System, it is ideal for production and entertainment applications. The GXD amplifiers, with its outstanding performance and integral signal processing, it express all the hallmarks of the QSC brand - long-term reliability and professional audio quality. Add contemporary styling, light weight, multiple routing options, advanced protection circuitry and digital signal processing, and the GXD Series surely represents real value - something that everyone can use. The GXD series is enhanced for use with 8 and 4 ohm loudspeaker loads. The GXD amplifiers is delivering just the right amount of power to the most popular speakers used by production professionals and entertainers. One of this is the QSC GXD4 Lightweight, class-D professional power amplifier with DSP, 2 channels, 400 watts/ch at 8Ω, 600 watts/ch at 4Ω, total power capacity of 1600 watts.

The Right Power

There’s a GXD amplifier within 1dB of the ideal power for your speaker system. Best practice is to use an amplifier capable of delivering approximately twice the loudspeaker’s rated power capacity. Too much power probably means unnecessary amplifier expense. Too little amplifier and the speakers won’t deliver everything they’re capable of and the risk of destructive amplifier clipping is increased. In order to know the right amount of power points for the GXD series, QSC examined the loudspeakers that is most widely used for sound reinforcement by DJs, production professionals and musicians. Overall, these speakers are designed with woofers that fall into a couple of categories of continuous power capacity - mid to high-power drivers rated around 250-400, and low-power drivers that can handle 150 - 250 watts. By using these drivers, a single woofer loudspeaker systems will typically have an impedance of 8Ω. Of course, a dual woofer loudspeakers will have power ratings that are twice that of the single woofer model and an impedance that is half that of single-woofer models.

Digital Signal Processing

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 GXD amps bring 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 are provided as generic “starting points” are included. To further prove the point, the GXD amplifiers come pre-loaded with QSC E Series loudspeaker tunings, enabling a simple connect and play system that maximizes the performance of the system.

Digital Limiting

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 (4Ω and 8Ω), and selecting whether Mild, Medium or Agressive protection is desired.


  • High peak output power with up to 1600 watts from the GXD 4 and a whopping 4500 Watts from the GXD 8.
  • Power levels matched to the most popular loudspeakers and optimized for maximum real-world headroom into 4Ω and 8Ω 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 and low-pass filters, 4-band parameteric EQ, limiting, and delay.
  • E Series Entertainment System DSP Tunings are now available for GXD processing amplifiers:

             - Visit the GXD Firmware Updater to download and update

  • Large LCD display simplifies amplifier setup and indicates amp status.
  • Inputs: Parallel XLR and 1/4-inch 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.
8Ω dynamic, both channels driven 600 watts per channel
4Ω dynamic, both channels driven 800 watts per channel
8Ω continuous, both channels driven 400 watts per channel
4Ω continuous, both channels driven 600 watts per channel
Distortion (typical)
1 kHz at full rated power
< 1% THD 
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
Power Requirements 1/8 power at 4Ω
- 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 (4Ω) 1.25 dB
Damping Factor (8Ω) 100
Input Impedance 20 kΩ (balanced), 10 kΩ (unbalanced)
Maximum Input Level +23.5 dBu
Input Connectors 
(each channel)
3-pin XLR/F / 1/4-inch 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-inch × 1.0-inch, 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, agressiveness, and impedance selection
Delay 50 msec max.
Dimensions (HWD) 3.5-inch (2 RU) × 19-inch × 10.2-inch (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