Professional Power Amplifiers GX Series GX3 | GX5 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, while the GX5 provides full performance for 500 watt (Program) speakers. Both models supply maximum possible power to 4 ohm and 8 ohm loads. Owners of popular 4 ohm loudspeakers (dual-woofer, 2-way models and many subwoofers) will find the 700 watt (4 ohm) power of the GX5 an ideal match. Technical Notes 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 GX5 uses a Class H system, based on key elements of the PLX Series, almost doubling power in the same size and weight. 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. Both amplifiers use 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. GuardRailTM 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. Features · Power levels matched to the most popular speakers used by entertainers · Optimized for maximum real-world headroom into 4 and 8 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 30 lb (13.5 kg) · Detented gain controls for precise setting and matching of sensitivity · GuardRailTM 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 Choose the right GX amp for your speakers Model GX3 GX5 For 8 speakers: 250 W ­ 350 W (program)* For 8 speakers: 400 W ­ 600 W (program)** * For 4 speakers: 350 W ­ 500 W (program) ** For 4 speakers: 550 W ­ 900 W (program) GX Series GX3 Stereo Mode 8 / both channels driven / 1 kHz* 8 / single channel driven / 1 kHz* 4 / both channels driven / 1 kHz* 4 / single channel driven / 1 kHz* Distortion (typical) 20 Hz ­ 20 kHz: 1 dB below rated power Signal to Noise (20 Hz ­ 20 kHz) Input Sensitivity Voltage Gain (8) Output Circuitry Power Requirements (1/8 power, pink noise at 4, 120 V) Frequency Response Dynamic Headroom (4) Damping Factor Input Impedance () Maximum Input Level Input Connectors (each channel) Output Connectors (each channel) Amplifier and Load Protection Front Panel Controls and Indicators 300 W 350 W 425 W 500 W 8: less than 0.05% / 4: less than 0.1% 100 dB 1.2 Vrms 32.2 dB Class B 6.3 A 20 Hz ­ 20 kHz, +0, 1 dB 2 dB 100 Greater than 20k (balanced) +24 dB (16 Vrms) 3-pin XLR and 1/4" TRS, balanced, parallel Phono, unbalanced Speakon®, 1/4", Binding Posts Short circuit, open circuit, thermal, RF protection Load protected against DC faults Gain controls, 21 detents Red Clip LEDs, proportional, 0.1% THD threshold Green Signal LEDs, threshold -35 dB Blue Power LED, AC on Full Range / Crossover switch 100 Hz, 3rd order LP (sub), 2nd order HP (top) 3.5" (2 RU) x 19" x 10.1" (89 mm x 483 mm x 257 mm) 27 lb (12.1 kg) / 31 lb (14.1 kg) UL, CE, RoHS/WEEE compliant 34.4 dB 2-tier Class H 6A GX5 500 W 600 W 700 W 850 W Specifications Rear Panel Controls Dimensions (HWD) Weight - Net / Shipping Agency Approvals * At onset of clipping 28 lb (12.6 kg) / 32 lb (14.6 kg) Inputs XLR, 1/4" TRS and phono input connectors for compatibility with any source Crossover Subwoofer/Satellite crossover built-in Speakon® Outputs to Speakers combo output connector accepts 1/4" or Speakon 2 wire connectors Binding post output for compatibility with any loudspeaker wiring scheme All specifications are subject to change without notice. ©2008 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and other countries. GuardRail is a trademark of QSC Audio Products, LLC. Speakon is a trademark of Neutrik. All other trademarks are the property of their respective owners. US patent pending. Other patents may apply. please recycle 1675 MacArthur Boulevard · Costa Mesa, CA 92626 · Ph: 800/854-4079 or 714/957-7100 · Fax: 714/754-6174 GX Spec Sheet 06/05/09 qscaudio.com ...