QSC GXD4 2-Channel 400W Power Amplifier

Get the perfect amount of power with the GXD4 from QSC. This 2-Channel 400W Power Amplifier matches the most popular loudspeakers while optimizing real-world headroom.

Great for speaker processing, this power amp features E Series Entertainment System DSP Tunings, and includes precision rotary encoders that allow you to calibrate gain and DSP parameters.

QSC GXD4 Features

• Two-channel, 400W power amplifier
• High peak output power with up to 1600W
• Power levels matched to the most popular loudspeakers and optimized for maximum real-world headroom into 4O and 8O speaker systems
• Adjustable speaker protection to match your loudspeaker’s power and impedance
• Front panel LEDs indicate signal presence, input overload, and amplifier clipping.
• 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
• 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-thru capability
• Outputs: Professional binding post and NL4 connectors (compatible with NL2) provide for mono and bi-amp speaker connections
• Precision rotary encoders for gain and DSP parameter control
• Digital limiting automatically protects the amplifier from damage due to temperature rise or overdrive

• GXD4 2-Channel 400W Power Amplifier1
• Power Cable1
• Quick Start Guide1

• Output power per channel
  • 8Ω dynamic, both channels driven: 600W
  • 4Ω dynamic, both channels driven: 800W
  • 8Ω continuous, both channels driven: 400W
  • 4Ω continuous, both channels driven: 600W
• Distortion (typical) 1 kHz at full rated power< 1% THD 
• Signal to Noise (A weighted, 20 Hz–20 kHz)100 dB 
• Input Sensitivity1.2 Vrms, 3.9 Vrms 
• Maximum Voltage Gain33.5 dB
• Output CircuitryClass D
• Power Requirements1/8 power at 4Ω
• - 100V AC3.4 A
• - 120V AC2.9 A
• - 230V AC1.6 A
• Frequency Response (20 Hz–20 kHz)+0.7 dB, -0.8 dB
• Dynamic Headroom (4Ω)1.25 dB
• Damping Factor (8Ω)100
• Input Impedance20 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)3.5 (2 RU) × 19 × 10.2 in (89 × 483 × 259 mm)
• Carton Dimensions (H×W×D)23.6 × 14.6 × 6 in (600 × 370 × 153 mm)
• Net Weight11.3 lbs (5.1 kg)
• Shipping Weight15.4 lbs (7 kg)
• Agency ApprovalsUL, CE, RoHS/WEEE compliant

More about the GDX4

The GXD4 delivers high peak output power with up to 1600 watts. Other features include adjustable speaker protection for matching an individual loudspeaker’s power and impedance, as well as digital limiting that automatically prevents damage to the amplifier with rising temperatures or overdrive.

More about QSC’s GXD Power Amplifiers

Like all QSC’s products, the GXD series of power amplifiers are characterized by professional-quality audio, meticulous engineering, precision manufacturing, and long-term reliability.

With a specifically-chosen power supply and precision-engineered topology, the GX Class-D amplifier series are also small and light without compromising on features, quality, or power.

Optimized to deliver maximum real-world headroom, GXD amps are ideal for incorporating into 4Ω and 8Ω loudspeaker systems. Their LCD allows you to control and monitor in dim lighting and includes three buttons for menu navigation, and two knobs for adjusting parameters. Edit, store, and recall up to 18 User Presets to match any configuration or system.

Explore versatile connectivity options with parallel XLR and ¼” TRS connectors for inputs on each channel, and professional NL4 outputs. Binding post connectors enable mono and bi-amp speaker connectivity as well.

Other speaker processing features include channel gain and polarity, 4th Order Linkwitz Riley high-pass and low-pass filters, 4-band parametric EQ, 50 mSec of alignment delay, QSC Smart Speaker Protection limiter, and much more!