QSC GX3 425W 2-channel Power Amplifier
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The QSC GX3 stereo power amplifier have optimized output and appearance while reducing raw material cost and weight. It's all here – dramatic styling, easy hookup and adjustments, excellent audio quality and QSC reliability.

QSC GX3 stereo power amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker's "Program (Music) Power" rating or two times (2 x) the "Continuous (RMS) Power" rating. The GX3 is ideal for speakers in the 300 watt (Program) range, supplying maximum possible power to 4 ohm and 8 ohm loads.

Technical Notes
The GX3 uses the latest evolution of the QSC Grounded Collector output system, for optimum cooling of the critical power transistors. A true Class B biasing system combines maximum thermal efficiency with excellent audio performance.

GuardRail protection delivers full peak power while preventing detrimental overloads. During excessive clipping, or extreme overheating, GuardRail reduces gain just enough to preserve the integrity of the music, protect the speakers and keep the audience excited, without unprofessional distortion levels or shutdowns.

Subwoofer/Satellite Crossover
A subwoofer reduces strain on the full-range speaker, allowing it to play louder, or letting a smaller speaker do the same job. The GX Series supports this mode with a Crossover switch that splits the full-range input entering Ch 1, sending 20 Hz - 100 Hz to the sub (Ch 1) and 100 Hz - 20 kHz to the top box (Ch 2). The front panel gain controls balance the sub and top box, while GuardRail optimizes peak power into the sub and top individually, for greater musical impact and dynamic range.


    • 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 lbs (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


  • 8 ohms / 1 kHz (both channels driven) 300 W
  • 8 ohms / 1 kHz (single channels driven) 350 W
  • 4 ohms / 1 kHz (both channels driven) 425 W
  • 4 ohms / 1 kHz (single channels driven) 500 W
  • Distortion (typical) 20 Hz - 20 kHz, 1 dB below rated power: 8 ohms: less than 0.05%; 4 ohms: less than 0.1%
  • Signal to Noise (20 Hz - 20 kHz) 100 dB
  • Input Sensitivity 1.2 Vrms
  • Voltage Gain (8 ohms) 32.2 dB 34.4 dB
  • Output Circuitry Class B
  • Power Requirements (1/8 power, pink noise at 4 ohms, 120V) 6.3A
  • Frequency Response 20 Hz - 20 kHz, +0, 1 dB
  • Dynamic Headroom (4 ohms) 2 dB
  • Damping Factor (8 ohms) 100
  • Input Impedance (ohms) Greater than 20k (balanced)
  • Maximum Input Level +24 dB (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 -35 dB; Blue Power LED, AC on
  • Rear Panel Controls Full Range / Crossover switch; 100 Hz, 3rd order LP (sub), 2nd order HP (top)
  • Item #: QSCGX3
  • Condition: New

QSC GX3 425W 2-channel Power Amplifier

Price: $349.99
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