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QSC GX3 Power Amplifier (GX3) with Speakon® Combo Output

300W, power levels matched to the most popular speakers used by entertainers, binding post, and 1/4" connectors

What's in the box:

  • QSC GX3 Power Amplifier
  • Three-Year Warranty


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GX3 amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget.

QSC's 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. The GX3 is ideal for speakers in the 300 watt (Program) range. It supplies maximum possible power to 4 ohm and 8 ohm loads. QSC designers 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.


  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4- and 8-ohm speaker systems
  • Inputs: XLR, 1/4-inch TRS and phono input connectors for compatibility with any source
  • Outputs: Speakon® combo accepts 1/4-inch (TS) plugs or Speakon 2- and 4-pole plugs (connects 2 poles only). Binding posts support all other speaker wiring systems
  • Minimum depth chassis (10.1-inch / 257 mm) fits in compact, inexpensive effects racks
  • Lightweight - GX3 and GX5 less than 26 lb (12.5 kg). GX7 only 15.5 lb (7 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

Be sure to check out the brochure and the video for more information!

Specifications for the QSC GX3 Power Amplifier

{ "Power Rating" : [ "8 ohms / 1 kHz (both channels driven): 300W", "8 ohms / 1 kHz (single channels driven): 350W", "4 ohms / 1 kHz (both channels driven): 425W", "4 ohms / 1 kHz (single channels driven): 500W" ], "Damping Factor" : "Not Specified By Manufacturer", "Input Sensitivity" : "1.2 Vrms", "Input Impedance" : "Greater than 20k (balanced) ", "Gain" : "32.2dB ", "Frequency Response" : "20Hz - 20kHz, +0, -1 dB ", "Signal-to-Noise Ratio" : "100dB", "Total Harmonic Distortion (THD)" : { "8 ohms" : "less than 0.05%", "4 ohms" : "less than 0.1% " }, "Input Connections" : [ "3-pin XLR and 1/4" TRS, balanced, parallel", "Phono, unbalanced" ], "Output Connectors" : "Speakon, 1/4", Binding Posts", "Controls Front Panel" : [ "Gain controls, 21 detents", "Red Clip LEDs, proportional, 0.1% THD threshold", "Green Signal LEDs, threshold -35 dB", "Blue Power LED, AC on" ], "Controls (Rear)" : [ "Full Range / Crossover switch", "100 Hz, 3rd order LP (sub), 2nd order HP (top)" ], "Indicators" : [ "Red Clip LEDs, proportional, 0.1% THD threshold", "Green Signal LEDs, threshold -35 dB", "Blue Power LED, AC on" ], "Cooling" : "Not Specified By Manufacturer", "Power Consumption" : [ "0.2 AC Amps, 44 per hour idle", "UL, CE, RoHS/WEEE Compliant" ], "Power Requirements" : "1/8 power, pink noise at 4 ohms, 120V 6.3A", "Dimensions (WxHxD)" : "19 x 3.5 10.1" (483 x 89 x 257mm)", "Weight" : "26 lbs (12 kg)", "Specialties" : "Subwoofer/Satellite crossover built-in " }