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QSC GX3 Professional 2x425-Watt@4 Ohms Power Amplifier

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Product Description

The GX3 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 GX3 amplifiers 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 music, protect the speakers and keep the audience excited, without unprofessional distortion levels or shutdowns. Learn more about how GuardRail Protection works

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.

• Power levels matched to the most popular speakers
• 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.
• Minimum depth chassis (10.1" / 257 mm) fits in compact, inexpensive effects racks
• Lightweight - less than 26 lbs (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

• 8 ohms / 1 kHz (both channels driven) 300 W
• 8 ohms / 1 kHz (single channels driven) 350 W
• 4 ohms / 1 kHz (both channels driven) 425 W
• 4 ohms / 1 kHz (single channels driven) 500 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) 32.2 dB
• Output Circuitry: Class B
• Power Requirements (1/8 power, pink noise at 4 ohms, 120V) 6.3A
• Frequency Response: 20 Hz - 20 kHz, +0, 1 dB
• Dynamic Headroom (4 ohms): 2 dB
• Damping Factor (8 ohms): 100
• Input Impedance (ohms): Greater than 20k (balanced)
• Maximum Input Level: +24 dB (16 Vrms)
• Input Connectors (each channel):

(2) 3-pin XLR
(2) 1/4" TRS, balanced , parallel
(2) 1/4" 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: Ch1, Ch 2, (21 detents)
Red Clip LEDs: proportional, 0.1% THD threshold
Green Signal LEDs: threshold -35 dB
Blue Power LED: AC on

• Rear Panel Controls:

Full Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top)

• Cordset: 120V 50/60 Hz 230V 50 Hz
• Dimensions (HxWxD):

3.5" x 19" x 10.1"  (89 x 483 x 257mm)
2 Rack Spaces

• Weight: Net: 25 lbs (11.5 kg)
• Agency Approvals: UL, CE, RoHS/WEEE Compliant

Other Details

Manufacturer's Suggested Retail Price:
Wattage per channel at 8 ohms:
Wattage per channel at 4 ohms:
Input Connections:
XLR, 1/4", RCA
Output Connections:
Speakon, Binding Post
Built in DSP:

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