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QSC GX3 300 Watt 8-Ohm Professional Power Amplifier

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Product Description

QSC GX3 300 Watt 8-Ohm Power Amplifier

GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Power levels matched to the most popular speakers. Inputs: XLR, 1/4" TRS and phono. Outputs: Speakon® combo and binding posts.


  • 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 racks
  • 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
  • Subwoofer/satellite crossover built-in
Output power per channel 4 Ω / 1 kHz (both channels driven): 425 W
Output power per channel 8 Ω / 1 kHz (both channels driven): 300 W
Voltage: USA 120v
Output power per channel 8 Ω / 1 kHz (single channel driven): 350 W
Voltage Gain: 32.2 dB
Output Circuitry: Class B
Output power per channel 4 Ω / 1 kHz (single channel driven): 500 W
Input Impedance: Greater than 20 kΩ (balanced)
Signal to Noise (20 Hz - 20 kHz): 100 dB
Input Sensitivity: 1.2 V rms
Dynamic Headroom (4 Ω): 2 dB
Distortion (1 dB below rated power, 1 kHz): 8 Ω: less than 0.02%; 4 Ω: less than 0.05%
Output Connectors (each channel): Speakon®, 1/4", Binding posts
Input Connectors (each channel): 3-pin XLR and 1/4" TRS, balanced, parallel, Phono, unbalanced
Power Requirements (1/8 power, pink noise at 4 Ω, 120V): 6.3 A
Frequency Response: 20 Hz–20 kHz, +0, -1 dB
Rear Panel Controls: Full Range / Crossover switch 100 Hz, 3rd order LP (sub), 2nd order HP (top)
Dimensions: Height: 3.5" (89 mm) 2RU Width: 19" (483 mm) Depth: 10.1" (257 mm)
Amplifier and Load Protection: Short circuit, open circuit, thermal, RF protection Load protected against DC faults
AC Current and Heating(BTU/hour), 120 VAC, (multiply current by 0.5 for 230 VAC) iply current by 0.5 for 230 VAC): 0.2/44(Idle), 4.1/904(8 + 8 Ω, 1/8 power 1), 6.1/1160(8 + 8 Ω, 1/3 power 2), 9.75/1109(8 + 8 Ω, full power 3), 6.3/1515(4 + 4 Ω, 1/8 power 1), 9.4/2105(4 + 4 Ω, 1/3 power 2), 15/2297(4 + 4 Ω, full power 3)
Maximum Input Level: +24 dBu (16 V rms)
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
Weight: Net: 27 lb (12.1 kg) Shipping: 31 lb (14.1 kg)
Agency Approvals: UL, CE, RoHS/WEEE Compliant

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