Professional Two Channel 300 Watt Per Channel High Power Amplifier
Availability: 8 in stock
Manufacturer: QSC

8 ohms / 1 kHz (both channels driven) 300 W
8 ohms / 1 kHz (single channel driven) 350 W
4 ohms / 1 kHz (both channels driven) 425 W
4 ohms / 1 kHz (single channel driven) 500 W
Distortion (1 dB below rated power, 1 kHz) 8 ohms: less than 0.02% 4 ohms: less than 0.05%
Signal to Noise (20 Hz - 20 kHz) 100 dB
Input Sensitivity 1.2 Vrms
Voltage Gain (8 ohms) 32.2 dB
Output Circuitry Class B
Power levels matched to the most popular speakers used by entertainers
Optimized for maximum real-world headroom into 4 ohm & 8 ohm speaker systems
Inputs: XLR, 1/4-in TRS & phono input connectors for compatibility w/any source
Outputs: Speakon combo accepts, 1/4-in (TS) plugs or Speakon 2-pole & 4-pole plugs (connects 2 poles only).
Binding posts support all other speaker wiring systems
Minimum depth chassis (10.1-in /257 mm) fits in compact, inexpensive effects racks
Lightweight - GX3 less than 26 lbs (12.5 kg).
Detented gain controls for precise setting & matching of sensitivity
GuardRail automatically protects the amplifier & loudspeakers from damage due to temperature rise or overdrive without shutting down the show
Front panel LEDs monitor Power, Signal & Clipping
Subwoofer/Satellite crossover built-in
* 230V 16.5 lbs (7.5 kg)
GX Series amplifiers are ideal for professional entertainers who require maximum performance & portability on a limited budget.
The hallmarks of the QSC brand - professional audio quality, meticulous engineering, precision manufacturing & long-term reliability - are all intrinsic to GX.
Add contemporary styling, multiple input/output options, light weight, & advanced protection circuitry, & the GX Series clearly represents real value - something everyone can use.
GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers.
Typically, loudspeaker manufacturers recommend an amplifier w/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.
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 w/excellent audio performance.
Uses premium toroidal power transformers for reliable "mid-weight" performance.
A variable-speed fan moves air crosswise through the amplifier, drawing cool air in over the power transformer, through the fan, & then over the heat sink.
This keeps the transformer cool & allows a full size heat sink to fit in a down-sized chassis.
As always, GX Series amplifiers are fully protected from the usual hazards of the trade, ensuring stable performance & long life.
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 & keep the audience excited, without unprofessional distortion levels or shutdowns.
Learn more about how GuardRail Protection works
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 w/a Crossover switch that splits the full-range input entering Ch 1, sending 20 Hz -100 Hz to the sub (Ch 1) & 100 Hz - 20 kHz to the top box (Ch 2).
The front panel gain controls balance the sub & top box, while GuardRail optimizes peak power into the sub & top individually, for greater musical impact & dynamic range.
Learn More