Power Amplifier Rated at 500W Per Channel @ 8 ohms


Our Price: $399.99List Price: $499.99
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The QSC GX5 professional power amplifier is for professional entertainers that require maximum performance and portability.  This power amp is ideal for speakers in the 500 watt (Program) range, supplies maximum possible power to 4 ohm and 8 ohm loads, and features easy hookup and adjustments.  Owners of popular 4 ohm loudspeakers (dual-woofer, two-way models and many subwoofers) will find the 700 watt (4 ohm) power of the GX5 an ideal match.

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.

Uses 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 audio and protect the speakers 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 GX5 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.

Other Features:

  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4 ohm and 8 ohm speakersystems
  • Inputs: XLR, 1/4" TRS and phono input connectors for compatibility withany source
  • Outputs: Speakon® combo accepts, 1/4" (TS) plugs or Speakon 2-pole and4-pole plugs (connects 2 poles only). Binding posts support all other speakerwiring systems.
  • Minimum-depth chassis fits in compact, inexpensive effects racks
  • Detented gain controls for precise setting and matching of sensitivity
  • Front panel LEDs monitor Power, Signal and Clipping
  • Subwoofer/Satellite crossover built-in


  • 8 ohms/1 kHz (both channels driven): 500 W
  • 8 ohms/1 kHz (single channels driven): 600 W
  • 4 ohms/1 kHz (both channels driven): 700 W
  • 4 ohms/1 kHz (single channels driven): 850 W
  • Distortion (typical) 20 Hz-20kHz, 1 dB below rated power: 8 ohms: lessthan 0.05%
    4 ohms: less than 0.1%
  • Signal to Noise (20 Hz - 20 kHz): 100 dB
  • Input Sensitivity: 1.2 Vrms
  • Voltage Gain (8 ohms): 34.4 dB
  • Output circuitry: 2-tier Class H
  • Power Requirements (1/8 Power, Pink Noise @ 4 ohms,120 V): 6 A
  • Frequency Response: 20 Hz-20kHz, +0, 1 dB
  • Dynamic Headroom (4 ohms):2 dB
  • Damping Factor (8ohms):100
  • Input Impedance(ohms):Greater than 20k (balanced)
  • Maximum Input Level: +24dB(16 Vrms)
  • InputConnectors(each channel): 3-pin XLR and 1/4" TRS, balanced,parallel
    Phono, unbalanced
  • Output Connectors(eachchannel): Speakon®, 1/4", Binding Posts
  • Amplifier and Load Protection: Shortcircuit,open circuit, thermal, RF protection
    Load protected against DC faults
  • FrontPanelControls and Indicators: Gain controls,21detents
    Red Clip LEDs, proportional, 0.1% THD threshold
    GreenSignalLEDs, threshold -35 dB
    Blue Power LED, AC on
  • RearPanelControls: Full Range / Crossover switch
    100 Hz,3rd order LP (sub), 2nd order HP (top)
  • Cordset:
      120V50/60 Hz:NEMA-15
      230V 50 Hz: Euro 16A
  • Dimensions: 3.5" H x 19" W x 10.1" D (89 x 483x 257 mm),  2 RU High
  • NetWeight: 26 lbs. (12 kg)
    Shipping Weight: 31 lbs.(14 kg)
  • Agency Approvals: UL, CE, RoHS/WEEECompliant

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