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QSC GX3 Stereo Power Amplifier

499.99 $499.99
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Maximum performance at a modest price, plus flexible I/O.

The GX3 stereo power amplifier from QSC offers everything performers need to electrify their live shows with 300W per channel of power, while remaining light enough to transport between gigs. Optimized for speakers in the 300W range, the GX3 effortlessly drives 4 ohm and 8 ohm loads for full, rich sound.

Advanced Cooling System Keeps Things Running Smoothly

The GX3 utilizes QSC's acclaimed Grounded Collector output system to keep internal components operating at peak efficiency, even under demanding conditions. By effectively dissipating heat, the GX3 avoids performance issues that often plague lesser amplifiers. You'll enjoy consistent, uncompromised sound for the duration of your show.

Intuitive Controls Make Adjustments a Breeze

With its straightforward front panel layout, the GX3 amplifier is easy to set up and adjust on the fly. Turn the level knobs to quickly balance left and right channels, while the power switch and LED indicator provide an obvious visual reference for on/off status. For many performers, the GX3's minimal complexity is a major benefit, allowing you to focus on your performance rather than fussing with finicky controls.

Road-Ready Ruggedness

From the durable steel chassis to the reinforced corners, the GX3 is built to withstand the rigors of live performance and frequent transport between venues. It will provide years of reliable service, giving you peace of mind that it can handle whatever your schedule demands. The included mounting ears make rack installation quick and secure.

Unmatched Value

For professional entertainers seeking maximum power and portability on a budget, the GX3 stereo power amplifier offers unparalleled performance per dollar. With QSC's signature sound quality and build, it's an ideal choice for taking your show to the next level without breaking the bank.


  • 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
  • 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

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GX3 Stereo Power Amplifier Specifications:

Power Rating
  • 8 ohm / both channels driven / 1kHz: 300W
  • 8 ohm / single channel driven / 1kHz: 350W
  • 4 ohm / both channels driven / 1kHz; 425W
  • 4 ohm / single channel driven / 1kHz; 500W
  • 2 ohm / both channels driven / 1kHz; 200W
  • Distortion (typical): 20Hz–20kHz: 1dB below rated power 8 ohm: less than 0.05%/4 ohm: less than 0.1%
  • Signal to Noise: (20Hz–20 kHz) 100dB
  • Input Sensitivity: 1.2 Vrms
  • Voltage Gain: (8 ohm) 32.2dB
  • Output Circuitry: Class B
  • Power Requirements: (1/8 power, pink noise at 4 ohm, 120V) 6.3A
  • Frequency Response: 20 Hz–20 kHz, +0, 1dB
  • Dynamic Headroom (4 ohm): 2dB
  • Damping Factor: 100
  • Input Impedance (ohm): Greater than 20k (balanced)
  • Maximum Input Level: +24dB (16 Vrms)
  • Input Connectors (each channel): 3-pin XLR and 1/4" 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 -35dB
  • Blue Power LED, AC on
  • Rear Panel Controls: Full Range / Crossover switch
  • 100 Hz, 3rd order LP (sub), 2nd order HP (top)
  • Dimensions (HWD): 3.5" (2RU) x 19" x 10.1" (89 mm x 483 mm x 257 mm)
  • Weight: Shipping / Net 30 (13.5 kg) / 25 lb. (11.5 kg) Agency Approvals: UL, CE, RoHS/WEEE compliant

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