Specs
Features
• Power levels matched to the most popular
speakers used by entertainers
• Optimized for maximum real-world
headroom into 4Ω and 8Ω 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 26 lb (12.5 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
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, while the GX5 provides
full performance for 500 watt (Program) speakers. Both models supply maximum possible
power to 4 ohm and 8 ohm loads. Owners of popular 4 ohm loudspeakers (dual-woofer,
2-way models and many subwoofers) will find the 700 watt (4 ohm) power of the GX5 an
ideal match.
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 with excellent audio performance.
The GX5 uses a Class H system, based on key elements of the PLX Series, almost doubling
power in the same size and weight. 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.
Both amplifiers 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™
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.
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 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.
Choose the right GX amp for your speakers
Model
GX3 For 8Ω speakers: 250 W – 350 W (program)*
GX5 For 8Ω speakers: 400 W – 600 W (program)**
GX Series
Professional Power Amplifiers
GX3 | GX5
*
For 4Ω speakers: 350 W – 500 W (program)
**
For 4Ω speakers: 550 W – 900 W (program)