QSC GX5 Power Amplifier

2-channel Power Amplifier, 700W Program/ch at 4 ohms, with Load Protection, Crossover Switch
QSC GX5 Power Amplifier image 1
QSC GX5 Power Amplifier image 1
Sweetwater Savings: $99.01 MSRP: $499.00
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QSC GX5 Power Amplifier
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A Lightweight Power Amp That Really Packs a Punch!

The QSC GX5 700-watt power amplifier gives your speakers the power they need while giving you the efficiency and protective features you want for easy operation and peace of mind. The GX5 uses advanced components for both light weight and reliability. Its Guardrail protection allows delivery of peak power while preventing overloads. It's equipped with a crossover switch, so adding a subwoofer to your system is a snap. Optimized for 4- and 8-ohm speakers, this amp also fits perfectly into popular racks, and its lightweight design (less than 30 lbs.) makes the GX5 incredibly easy to transport.

The right amount of power for your application

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 the "Continuous (RMS) Power" rating.

The GX5 provides full performance for 500 watt (Program) speakers. It supplies 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.

Efficient operation

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 the 700-watt GX5 and 425-watt GX3 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: protection from overloads

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-ready when you are

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 20Hz-100Hz to the sub (Ch 1) and 100Hz-20kHz 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.

QSC GX5 700-watt Power Amplifier Features:

  • 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 systems.
  • Minimum depth chassis (10.1" / 257 mm) fits in compact, inexpensive effects racks
  • Lightweight - less than 30 lbs.
  • 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
  • Power at 4 ohms/1kHz (both channels driven): 700W
  • Distortion (typical): 20Hz-20kHz, 1dB below rated power
  • Dynamic headroom (4 ohms): 2dB
  • Input impedance (ohms): greater than 20k (balanced)
  • Maximum input level: +24 dB (16 Vrms)
  • Input connectors (each channel):
  • 3-pin XLR and 1/4" TRS, balanced, parallel
  • 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, 21 detents; red clip LEDs, proportional, 0.1% THD threshold; green signal LEDs, threshold -35dB; blue power LED, AC on
  • Rear panel controls: Full range/crossover switch
  • 100Hz, 3rd order LP (sub), 2nd order HP (top)
  • Dimensions" Height: 3.5"/2RU;
  • width: 19"; depth: 10.1"
  • Net weight: 28 lbs.

Additional Media

Power Amp Buying Guide

Tech Specs

Number of Channels 2
Power Class Class H
Watts/Side @ 8 ohms 500W
Watts/Side @ 4 ohms 700W
Inputs 2 x XLR, 2 x 1/4", 2 x RCA
Outputs 2 x SpeakON, 2 x Binding Posts
Cooling System Variable-speed fan with rear-to-front airflow
Rack Spaces 2U
Height 3.5"
Depth 10.1"
Width 19"
Weight 28 lbs.
Manufacturer Part Number GX5

Customer Reviews

Based on 21 reviews
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Proof that Quality Delivers

Throughout the past 30years I have probably been through a few dozen power amps made by pretty much everyone from cheapos that blew or had some sort of defect (one of them blew when we hit the first chorus of the first song on a gig) to those equaling monthly Car payments vin that never gave a hint of ever giving up while running constantly at their limits. I got the GX5('s) for monitors and have actually switched them to be primary mains. There is something about the way the GX5 (and GX3) delivers dynamic power without effort that makes bands sound punchier and cleaner during busy and high-power-need passages. This is a mid-priced mid-range amp that is definitely punching above its weight class, and delivering!!! Everyone should buy or rent or borrow one for a wtf moment of Why does it sound so much better and louder? and its alot less watts..... Hhmmmmmmm
Music background: 35yrs Guitar, Pro Studio, Live Prod, Amp Designer/Builder

QSC- The only choice!

This is one of the QSC amps that I own. I am completely satisfied with this amp and it's quality, features, and pristine sound! I have used this both in stereo mode and also in the crossover mode and it performs exceptionally well under both conditions. Drives subs without any problems and runs cool for hours and hours all while maintaining that great sound that I love from QSC amps. I have used many different brand amps over the years (running live sound) and I much prefer QSC over Crown ANYDAY! I feel QSC's are more dynamic and have better sound quality and they hold up longer (proven to me many times). They are used by many sound companies for that very reason. This is truly a great amp for live sound as well as DJing. QSC has done it, again!
Music background: Active gigging Bassist, sound engineer, home recording

Amazing Amp

After a long search for the right amps for my cover rock band I settled on these and I am extremely happy with my choice I baught two GX5. This amp has just what you need and nothing you dont! I have two of these one to power both my Peavey pv118 subs and one to powere my tops which are 15s, very clean power, crystal clear and no clipping, toss anything at these amps you want and they handle it! The ratings are very accurate, 500 watts per chanell at 8ohms is just that more than enough to power my bands 4 speakers, from small venues to outsider we have plenty of power. There built like tanks and can withstand heat etc..we played 4 hours on a 90 plus degree day with the amps cranked and nopt a hicup! In my opinion you will not find better "working mans" amp than this one, its worth every penny and then some! I also own a GX3 To power our monitors, its an amazing set up, I expect to be using these amps for years to come, awesome job QSC !
Music background: Weekend Musician! Rock/80s Rock

Great Power - and outstanding sound reproduction quality in an inexpensive power amp

You typically buy a power amplifier because you need good clean sound reproduction and more power to enable you to play at much larger venues. In my case, I needed a sound system that would adequately support my guitar, my bass, my keyboard synthesizer and could also handle vocals and double as studio monitor for my home recording studio. In essence, I was looking for a powerful pristine sound reproduction system. I started out by selecting twin JBL JRX115 speaker cabinets and after reading over the amplifier requirements to drive those speakers, and researching the specifications of several power amplifiers and selected the QSC GX5 as the perfect match up for those speakers. I could not be happier with the clean, quiet, high quality sound reproduction I am receiving from this system and I now have adequate power to play almost anywhere I choose. The amazing thing for me was that I fully expected to pay a whole lot more for a system that would adequately support all those instruments and microphones and also sounds as good as this system does. There was enough money left over in my budget that I was also able to add a 16-channel mixer on the front end and now I can plug the entire band into this sound system and balance the sound perfectly and even record live off the mixer as we play. In the final analysis, the QSC GX5 is a workhorse that gives my band and my home recording studio the powerful, clean, quiet, quality of sound reproduction I was looking for. I couldn't be happier with this amp.
Music background: Musician / Songwriter / Home Recording Engineer

Amazing Power Amp

I have loved this amp since the day I got it. I had to replace an older crown amp that was a little more powerful then this one. I have had no issues with this one and it actually ended up being the exact amount of power I needed where my old one was slightly too much. Love QSC amps. I use almost all QSC for my power needs.
Music background: Recording/Live Sound Engineer

Sweetwater Advice

Evan Mehre

The QSC GX5 is a workhorse. I've used this amp for YEARS (both in a rack and thrown into the back of a van uncased) for powering monitors, practice speakers, and all sizes and shapes of mains. I've even taken it from a -20 degrees truck into a hot bar, and from damp basement practice spaces to 100-degree outdoor gigs. My GX5 has never tripped a breaker, never quit, never overheated, and has never let me down!
See also: Power Amps, QSC, QSC Power Amplifiers