GX3, Stereo Power Amplifier, 300 watts/ch at 8 Ohm, QSC
GX Series amplifiers are ideal for professional entertainers who
require maximum performance and portability on a limited budget. The
hallmarks of the QSC brand - professional audio quality, meticulous
engineering, precision manufacturing and long-term reliability - are all
intrinsic to GX. Add contemporary styling, multiple input/output
options, light weight, and advanced protection circuitry, and 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 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. The GX7
outputs 725 watts into an 8 ohm load. Owners of popular 4 ohm
loudspeakers (such as dual-woofer, two-way models) will find the 700
watt (4 ohm) power of the GX5 an ideal match while the GX7's 1000 watts
will very capably power many of today's popular subwoofers or two
typical 8 ohm speakers per channel.
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 PL Series, (PLX, PL3, CX, DCA)
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
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
The GX7 adds the road-proven PowerLight supply to
the Class H output section, for more overall output power and additional
weight savings. The result is one of the highest power-to-weight ratios
in the industry. A low-noise variable-speed fan with rear-to-front
airflow keeps amplifiers and racks cool.
As always, GX Series amplifiers are fully protected
from the usual hazards of the trade, ensuring stable performance and
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. 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
* 230V 16.5 lbs (7.5 kg)
- Lightweight - GX3 less than 26 lbs (12.5 kg). GX
- 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
- Front panel LEDs monitor Power, Signal and Clipping
- Subwoofer/Satellite crossover built-in