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QSC Amplifiers GXD4



  • 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.

Additional information

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

– 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)


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.

Product Dimensions (H×W×D)

89 × 483 × 259 mm 3.5 (2 RU) × 19 × 10.2 in

Carton Dimensions (H×W×D)

600 × 370 × 153 mm 23.6 × 14.6 × 6 in

Net Weight

5.1 kg / 11.3 lb

Shipping Weight

7 kg / 15.4 lb

Carton and Contents

Power cable and quick start guide


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