QSC GX3 Power Amplifier

QSC GX3 300-Watt Power Amplifier

The QSC GX3 Stereo Power Amplifier is ideal for professional entertainers who require maximum performance and portability on a limited budget. It's all here – dramatic styling, easy hookup and adjustments, excellent audio quality and QSC reliability.


GX 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. The GX3 supplies maximum possible power to 4 ohm and 8 ohm loads.

Technical Note

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. QSC design expertise allows the output devices to shift from low-power to high-power rails in less than a millionth of a second, ensuring that the output power is always right where it needs to be without excess loss.

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 - 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
XLR, 1/4" balanced and phono inputs for compatibility with any source
Speakon - 1/4" (TS) combo outputs, accepts 2-pole or 4-pole (connects 2 poles only)
Binding posts to support all other speaker wiring systems
Minimum depth chassis fits in compact, inexpensive racks
De-tented 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
Front panel LEDs monitor Power, Signal and Clipping
Subwoofer/Satellite crossover built-in