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GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers, headed by Pat Quilter, 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.
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.
The GX3 use 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, and then over the heat sink. This keeps the transformer cool and allows a full size heat sink to fit in a down-sized chassis. As always, the amplifiers are fully protected from the usual hazards of the trade, ensuring stable performance and 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 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 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 30 lbs (13.5 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) 500 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)
Voltage Gain (8 ohms)
20 Hz - 20 kHz, +0, -1 dB
Dynamic Headroom (4 ohms)
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)
Height: 3.5" (89 mm) 2RU
Width: 19" (483 mm)
Depth: 10.1" (257 mm)
Net: 27 lbs (12.1 kg)
Shipping: 31 lbs (14.1 kg)
AC Power Consumption, 230VAC
(1/8 power, typical operating conditions)
Operating Condition - AC amps
Idle - 0.10
8 + 8 ohms - 2.05
4 + 4 ohms - 3.15