QSC GXD 4 Professional 1600W Power Amplifier with DSP

Product #41810 | SKU GXD 4 | QSC
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1600W Max Power Output, Matched for 4 Ohm and 8 Ohm Speakers


The GXD 4 from QSC is a power amplifier designed for professional PA systems utilising speakers with 4 and 8 ohm loads and a maximum output of 1600W. The GXD 4 employs a class D output stage with a universal power supply for high performance and efficiency, while keeping the unit lightweight at 11.3 lbs. The integrated DSP section includes High and Low-Pass filters (24dB LR), 4-band parametric equaliser, signal alignment delay, and RMS/Peak speaker protection limiting.

The parallel XLR and 1/4" TRS input connectors offer broad compatibility with convenient loop-through capabilities, while the professional binding posts and NL4 connector provide mono and bi-amped speaker connections. In addition to the limiting offered on inputs and outputs, the GXD employs smart speaker protection by providing settings for the loudspeaker's continuous output and impedance (4 ohm or 8 ohm). The GXD 4 ships with a standard IEC power cord.


  • High peak output power with up to 1600 W
  • Power levels matched to the most popular loudspeakers and optimised 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 built-in loudspeaker processing, includes high & low-pass filters, 4-band PEQ, limiting, and delay
  • Large LCD display simplifies amplifier setup and indicates amp status
  • Inputs: Parallel XLR and 1/4” TRS connectors for compatibility with any source while providing convenient loop-through 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


Watts Per Channel 8 Ohm Dynamic (Both Channels Driven): 600 W
4 Ohm Dynamic (Both Channels Driven): 800 W
8 Ohm Continuous (Both Channels Driven): 400 W
4 Ohm Continuous (Both Channels Driven): 600 W
Total Harmonic Distortion (THD) Distortion: < 1% (typical), 1 kHz at full rated power
Signal to Noise Ratio Signal to Noise: 100 dB, (A-weighted, 20 Hz to 20 kHz)
Input Sensitivity 1.2 Vrms
3.9 Vrms
Voltage Gain 33.5 dB
Output Circuit Class D
Power Requirements Power Requirements: 1/8 power at 4 ohms

100 VAC: 3.4 A
120 VAC: 2.9 A
230 VAC: 1.6 A
Frequency Response 20 Hz to 20 kHz (+0.7 dB, -0.8 dB)
Headroom Dynamic Headroom: 1.25 dB (4 ohms)
Damping Factor 100
Input Impedance 20 kOhms (balanced)
10 kOhms (unbalanced)
Maximum Input Level +23.5 dBu
Input Connectors 3-pin XLR/F
1/4" TRS, balanced
Output Connectors NL4 (Channel 1 - 1+/-, Channel 2 - 2+/-), binding posts
Amplifier Protection Short circuit
Open circuit
RF protection
Load protected against DC faults
Front Panel Controls and Indicators 2 x rotary encoders
3 x operational buttons (HOME, ENTER, EXIT)
2 x green signal LEDs, indicate signal presence
2 x red A/D clip LEDs, indicate input over-drive and/or amplifier current clipping
Blue power LED ring, AC on
256 x 128 Pixel LCD: 2.1 x 1.0" / 5.4 x 2.5 cm
Digital Signal Processing (DSP) 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: Variable frequency, gain, and bandwidth
Peak Limiter: Power, aggressiveness, and impedance selection
Delay: 50 ms maximum
Approvals UL, COE, RoHS/WEEE compliant
Dimensions (H x W x D) 3.5 x 19.0 x 10.2" / 8.9 x 48.3 x 25.9 cm
Weight 11.3 lb / 5.1 kg


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  • Product: QSC GXD 4 Professional 1600W Power Amplifier with DSP
  • Manufacturer: QSC
  • Model: GXD 4
  • SKU: GXD 4
  • RM Product #: 41810
  • Warranty: All QSC products have a 6-year warranty, with the exception of TouchMix mixers, which have a 3-year warranty.

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