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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, two-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.
GuardRail
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. Learn More
FEATURES
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.
1 1/8 power represents typical operating conditions 2 1/3 power represents peak program levels 3 Full power is breaker limited to short periods For 230 V, multiply AC current by 0.5 For 100 V, multiply AC current by 1.25
* At onset of clipping
All Specifications Subject to Change Without Notice.
Inputs XLR, 1/4" TRS and phono input connectors for compatibility with any source.
Crossover Subwoofer/Satellite crossover built-in.
Outputs to Speakers Speakon combo output connector accepts 1/4" or Speakon 2 wire connectors. Binding post output for compatibility with any loudspeaker wiring scheme .
I purchased the QSC GX5 several months ago and have used it almost every night since. I use it to supplement a powermixer who's output is woefully inadequate, in fact the QSC does ALL of the output work. The volume is cranked up to about 3/4 full and I just let it cook! The first thing I noticed was the clarity of the sound... crystal clear! And the power... it practically powers the whole band. It handles all of the vocals, a Hammond XK-3, a Korg piano AND a big set of Roland electronic drums! From personal experience I know that it takes a 25 lb. toriodal transformer to power a Class A amp at 200 watts (Avg Continuous Power) and I'd laugh when I see other amps claim to have 800, 1000, or 1500 watts per channel and the whole unit weighs 25 lbs. Now, I've never experienced a Class 'H' amp design before but decided to give it a try based on my faith that QSC was an excellent brand. Let me tell you... they knew what they were doing. The unit is not as heavy in comparison to other comparably rated units and this design amazes me that the audio output is so powerful. The amp might lack some of the frills that more expensive amps have (you can't run it on a 2 ohm load... it'll shut down) but it was meant to be that way. I have enough equipment to haul around and I'm not as young as I once was so believe me, if it's lighter weight and it delivers the power, I'm all for it.Now, I don't have money to burn but I'm thinking of adding a second unit and throwing in some sub-woofers. Yeah, a SECOND unit for SUBS! .I'm getting' psyched!
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