QSC GX5 850w Power Amplifier (Certified-Used)

  • $349.99


This is a previously used item which has been recertified by our quality assurance team.

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.

GX5 provides full performance for 500 watt (Program) speakers.

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 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, GX Series 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. GuardRail optimizes peak power into the sub and top individually, for greater musical impact and dynamic range.

Includes:

(1) QSC GX5 Power Amplifier
(1) IEC US Power Cord
(1) Operator's Instructions

  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4- and 8-ohm speaker systems
  • Inputs: XLR, 1/4-inch TRS and phono input connectors for compatibility with any source)
  • Outputs: Speakon® combo accepts 1/4-inch (TS) plugs or Speakon 2- and 4-pole plugs (connects 2 poles only). Binding posts support all other speaker wiring systems
  • Minimum depth chassis (10.1-inch / 257 mm) fits in compact, inexpensive effects racksl
  • Lightweight - GX3 and GX5 less than 26 lb (12.5 kg). GX7 only 15.5 lb (7 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
  • Stereo, bridge, or parallel operating modes
  • Subwoofer/satellite crossover built-in
OUTPUT POWER PER CHANNEL, both channels driven
8 ohms / 1 kHz 500 W
4 ohms / 1 kHz 700 W
OUTPUT POWER PER CHANNEL, single channel driven
8 ohms / 1 kHz 600 W
4 ohms / 1 kHz 850 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 34.4 dB
Output Circuitry 2-tier Class H
Power Requirements (1/8 power, pink noise at 4 ohms, 120V) 6 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-inch TRS, balanced, parallel
Phono, unbalanced
Output Connectors (each channel) Speakon®, 1/4-inch, 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)
Carton Dimensions (H×W×D) 24” x 15” x 10.1”
Shipping Weight 32 Lbs
Agency Approvals UL, CE, RoHS/WEEE Compliant
AC Current and Heating, 120 VAC (multiply current by 0.5 for 230 VAC)
Operating Condition AC amps BTU/hour
Idle 0.3 60
8 + 8 ohms, 1/8 power* 3.3 734
8 + 8 ohms, 1/3 power** 8.5 1456
8 + 8 ohms, full power*** 16.2 1891
4 + 4 ohms, 1/8 power* 5.8 1160
4 + 4 ohms, 1/3 power** 11.2 2162
4 + 4 ohms, full*** 24.5 3754
*1/8 power represents typical maximum operating conditions
**1/3 power represents over-driven program levels
***Full power is breaker limited to short periods
For 230 V, multiply AC current by 0.5
For 100 V, multiply AC current by 1.25

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