QSC GX5 500W 2-Channel Power Amp


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The QSC GX5 professional power amplifier 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 power amplifier is ideal for professional entertainers who require maximum performance and portability on a limited budget. This power amp is ideal for speakers in the 500W (Program) range, supplies maximum possible power to 4-ohm and 8-ohm loads, and features easy hookup and adjustments.

The GX5 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.

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.


  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4- and 8-ohm speaker systems
  • Detented gain controls for precise setting and matching of sensitivity
  • GuardRail automatically protects the amplifier and loudspeakers from damage
  • Subwoofer/satellite crossover built-in


  • Power Ratings:
    • 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 - 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): 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 - 20 kHz, +0, 1 dB
  • Dynamic Headroom (4 Ohms): 2 dB
  • Damping Factor (8 Ohms): 100
  • Input Impedance: Greater than 20 kOhms (balanced)
  • Maximum Input Level: +24dB (16 Vrms)
  • Input Connectors (each channel):
    • 3-pin XLR and1/4" 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 Pane lControls: Full Range /Crossover switch, 100 Hz, 3rd order LP (sub), 2nd order HP (top)
  • Cordset:
    • 120V 50/60 Hz: NEMA-15
    • 230V 50 Hz: Euro 16A
  • Dimensions (H x W x D): 3.5" x 19" x 10.1" (89 x 483 x 257 mm), 2U High
  • Net Weight : 26 lbs. (12 kg)
  • Agency Approvals: UL, CE, RoHS/WEEE Compliant