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    QSC GX3 Power Amplifier, 300 Watts

    The GX3 is optimized for real-world performance into 4 or 8 ohm systems.
    Product Rated 9.8 Out of 10 (4 ratings)
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    Web Item #QSCGX3

    QSC GX3 Power Amplifier
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    QSC Warranty: If you have additional warranty questions, please call the manufacturer at 800-772-2834



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    This product ships to: Can ship to United States Can ship to APO/FPO

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    QSC GX3 Power Amplifier (300 Watts) Product Description

    GX Series amplifiers are ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers, headed by Pat Quilter, have optimized output and appearance while reducing raw material cost and weight. It's all here - dramatic styling, easy hookup and adjustments, excellent audio quality and QSC reliability.

    GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker's "Program (Music) Power" rating or two times (2 x) the "Continuous (RMS) Power" rating.

    The GX3 is ideal for speakers in the 300 watt (Program) range. This model supplies the maximum possible power to 4 ohm and 8 ohm loads. 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.


    - Optimized for maximum real-world headroom into 4 Ohm 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-pole and 4-pole plugs (connects 2 poles only).
    - Binding posts support all other speaker wiring systems.
    - Minimum depth chassis (10.1 inches/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

    GX amplifiers deliver just the right amount of power to the most popular speakers used by entertainers. Most loudspeaker manufacturers recommend an amplifier with power output equal to the speaker's Program (Music) Power rating or two times (2 x) the Continuous (RMS) Power rating. The GX3 is ideal for speakers in the 300 watt (Program) range. The GX3 supplies maximum possible power to 4 ohm and 8 ohm loads.

    Technical Notes

    The GX3 uses 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. 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.

    The amplifier 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 Limiting Protects Your Speakers

    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.

    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.

    Same Day Music is an authorized dealer of QSC products.

    QSC GX3 Technical Description

    Output watts per channel:
    - 8 Ohms / both channels driven: 300 Watts
    - 8 Ohms / single channel driven: 350 Watts
    - 4 Ohms / both channels driven: 425 Watts
    - 4 Ohms / single channel driven: 500 Watts
    - 2 Ohms / both channels driven: 200 Watts

    - 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: 6.3A
    - Frequency Response: 20 Hz - 20 kHz, +0, 1 dB
    - Dynamic Headroom (4 Ohms): 2 dB
    - Damping Factor: 100
    - Input Impedance: Greater than 20k (balanced)
    - Maximum Input Level: +24 dB (16 Vrms)
    - Input Connectors (each channel): 3-pin XLR and 1/4-inch TRS, balanced, parallel Phono, unbalanced
    - Output Connectors (each channel): Speakon, 1/4-inch, Binding Posts
    - Amplifier and Load Protection: Short circuit, open circuit, thermal, RF protection Load protected against DC faults
    - Rear Panel Controls: Full Range / Crossover switch
    - Dimensions (H x W x D): 3.5 x 19 x 10.1 inches (89 mm x 483 mm x 257 mm)
    - Weight: 25 lbs (11.5 kg)

    - 8 Ohms: less than 0.05%
    - 4 Ohms: less than 0.1%

    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

    Same Day Music is an authorized dealer of QSC products.
    Shipping Weights and Dimensions
    Shipping Weight: 28 lbs
    Shipping Dimensions: 24 x 14 x 6 in

    User Reviews for QSC GX3 Power Amplifier (300 Watts)

    Product Rated 9.8 Out of 10 (4 ratings)

    4 users have rated this product, but no one has reviewed it yet. To rate this item and/or write a review, click the "Rate It" button.

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