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.
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.
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.
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.
Output power per channel:
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 V rms
Voltage Gain: 32.2 dB
Output Circuitry: Class B
Power Requirements (1/8 power, pink noise at 4 ohms, 120V): 6.3 A
Frequency Response: 20 Hz–20 kHz, +0, -1 dB
Dynamic Headroom (4 ohms): 2 dB
Input Impedance: Greater than 20 kΩ (balanced)
Maximum Input Level: +24 dBu (16 V rms)
Input Connectors (each channel)
3-pin XLR and 1/4" TRS, balanced, parallel
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 below clipping
Blue POWER LED, AC on
Rear Panel Controls:
Full Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top)
Height: 3.5" (89 mm) 2RU
Width: 19" (483 mm)
Depth: 10.1" (257 mm)
Agency Approvals: UL, CE, RoHS/WEEE Compliant