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GX Series Overview


collapse expand iconDescription

The QSC GX3 Stereo Power Amplifier delivers maximum performance for professional entertainers seeking an affordable, lightweight solution. QSC engineers optimized the GX3's power and appearance while reducing cost and weight, creating an amplifier ideal for speakers around 300W. With outputs optimized for popular 4 and 8-ohm loads, the rackmountable GX3 provides maximum headroom and power.

Flexible, Entertainer-Friendly Inputs and Outputs

The GX3's XLR, 1/4" TRS, and phono inputs ensure compatibility with any source. Speakon combo jacks accept 1/4" TS plugs or 2 or 4-pole Speakon plugs, connecting two poles only. Binding posts support other wiring systems.

Cooling System Provides Efficient, Reliable Performance

QSC's grounded collector output and true Class-B biasing maximize the GX3's thermal efficiency and audio quality. Detented gain controls allow precise sensitivity adjustment and matching.

Safeguard Your Investment with GuardRail Protection

QSC's GuardRail technology protects the amplifier and speakers from damage due to overheating or overdriving without interrupting your performance. Front-panel LEDs monitor power, signal, and clipping to give you full control over your sound.

Flexible Crossover and Compact Design

A built-in subwoofer/satellite crossover provides flexibility, while the GX3's 10.1" depth fits in standard racks. Lightweight and compact, the GX3 delivers professional quality you can take anywhere.

QSC GX3 Stereo Power Amplifier
QSC GX3 Stereo Power Amplifier
QSC GX3 Stereo Power Amplifier

collapse expand iconFeatures

  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4 ohm and 8 ohm speaker systems
  • Inputs: XLR, 1/4" TRS and phono input connectors for compatibility with any source
  • Outputs: Speakon combo accepts, 1/4" (TS) plugs or speakON 2-pole and 4-pole plugs (connects 2 poles only), binding posts support all other speaker wiring systems
  • Minimum depth chassis (10.1"/257 mm) fits in compact, inexpensive effects racks
  • Lightweight: less than 26 lb. (12.5 kg)
  • Detented gain controls for precise setting and matching of sensitivity
  • GuardRail automatically protects the amplifier and loudspeakers from damage due to temperature rise or overdrive without shutting down the show
  • Front panel LEDs monitor Power, Signal and Clipping
  • Subwoofer/Satellite crossover built-in

collapse expand iconSpecs

Power Rating
  • 8 ohm / both channels driven / 1kHz: 300W
  • 8 ohm / single channel driven / 1kHz: 350W
  • 4 ohm / both channels driven / 1kHz; 425W
  • 4 ohm / single channel driven / 1kHz; 500W
  • 2 ohm / both channels driven / 1kHz; 200W
  • Distortion (typical): 20Hz–20kHz: 1dB below rated power 8 ohm: less than 0.05%/4 ohm: less than 0.1%
  • Signal to Noise: (20Hz–20 kHz) 100dB
  • Input Sensitivity: 1.2 Vrms
  • Voltage Gain: (8 ohm) 32.2dB
  • Output Circuitry: Class B
  • Power Requirements: (1/8 power, pink noise at 4 ohm, 120V) 6.3A
  • Frequency Response: 20 Hz–20 kHz, +0, 1dB
  • Dynamic Headroom (4 ohm): 2dB
  • Damping Factor: 100
  • Input Impedance (ohm): Greater than 20k (balanced)
  • Maximum Input Level: +24dB (16 Vrms)
  • Input Connectors (each channel): 3-pin XLR and 1/4" TRS, balanced, parallel Phono, unbalanced
  • Output Connectors (each channel) Speakon, 1/4", Binding Posts
  • Amplifier and Load Protection: Short circuit, open circuit, thermal, RF protection
  • Load protected against DC faults
  • Front Panel Controls and Indicators: Gain controls, 21 detents
  • Red Clip LEDs, proportional, 0.1% THD threshold
  • Green Signal LEDs, threshold -35dB
  • Blue Power LED, AC on
  • Rear Panel Controls: Full Range / Crossover switch
  • 100 Hz, 3rd order LP (sub), 2nd order HP (top)
  • Dimensions (HWD): 3.5" (2RU) x 19" x 10.1" (89 mm x 483 mm x 257 mm)
  • Weight: Shipping / Net 30 (13.5 kg) / 25 lb. (11.5 kg) Agency Approvals: UL, CE, RoHS/WEEE compliant

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