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QSC GX3 Power PA Amplifier 300W

QSC GX3 Power PA Amplifier 300W
QSC GX3 Power PA Amplifier 300W

QSC GX3 Power PA Amplifier 300W

Item #67675
(4 Reviews)
List Price: $399.99
USD$349.99 Request Price Match
You Save: USD$50.00 (13% Off)

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The GX3 is 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.

The GX3 delivers 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 GX3 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 GX3 an ideal match.

The GX3 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.

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.


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.

  • 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.
  • Minimum depth chassis (10.1" / 257 mm) fits in compact, inexpensive effects racks
  • Lightweight – less than 30 lbs (13.5 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) 300W
  • 8 ohms / 1 kHz (single channels driven) 350W
  • 4 ohms / 1 kHz (both channels driven) 425W
  • 4 ohms / 1 kHz (single channels driven) 500W
  • 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
  • Height: 3.5" (89 mm) 2RU, Width: 19" (483 mm), Depth: 10.1" (257 mm)
  • Weight -Net: 27 lbs (12.1 kg), Shipping: 31 lbs (14.1 kg)
… [ More ]
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Questions & Answers
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 4 questions Browse 4 questions and 4 answers
Why did you choose this?
ProSound and Stage Lighting Store
I am familiar with the product. I have 50+ years in pro audio. Selected for a friend's system.
Hank A on Jan 15, 2018
I am familiar with the product. I have 50+ years in pro audio. Selected for a friend's system.
Hank A on Jan 15, 2018
i would like to ask if this will work at 220volts?thanks
macoy on Oct 15, 2014
BEST ANSWER: Unless otherwise stated, all the products we offer is in US standard voltage (110/120V)
Will this work with Bose 802 speakers without fear of blowing the speakers?
cappy on May 4, 2011
BEST ANSWER: This speaker can handle 240W at 8 ohms. You'll have to get something that is less because this amp will blow the speakers.
I am shopping for a Power Amplifier for the Central Music System for my home. The system consists of 10 Speakers (2way Loud Speaker System, Model : BL-043260B; 8 Ohms) with Volume control (Model SCW-1D, 21.9 rms Max O/p, 60w Max input)and 2 speakers (8 Ohms)with out Volume control. Please advise if this Amplifier will suffice my requirement. Thanks
Hari on Jul 24, 2010
BEST ANSWER: Please contact PSSL for more information.
QSC GX3 Reviews
4.5 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
This Amp ROCKs and won,t break the bank!
Pros: Excellent Sound,Good Warmth,Powerful,Easy To Use,Portable

This Amp ROCKs and won,t break the bank! Professional DJ, and positively Love QSC Amps!
Drives 4 Pevey PR series, doesn't break a sweat.
Rugged, Light, Clean! My Clients compliment the sound reguardless of the volume or type of music playing. PSSL and QSC can't be beat!
July 31, 2012
Big Bang for the buck!
Pros: Easy To Use,Powerful,Excellent Sound,Portable,Good Warmth

Typtical QSC Quality, I have two of these and I love them! They don't break a sweat and operate all day long.
March 4, 2013
over 6 years ago
Quality on a budget
Pros: Good Value,Durable,High Quality

This item is a great basic power amplifier for general-purpose PA applications. The input connections are what you would expect from a 2-channel amplifier of this type, in addition to the unbalanced RCA inputs which I haven't seen on the others. The output connections consist of your garden variety Speakons and binding-posts. One great feature is the crossover, which allows for a quick connection to a subwoofer and top box. One gripe that I have with the product is that the outputs are NOT bridgeable, so if you planned on relegating this to single-speaker use, you would have to settle for a negligible increase in PGM power.
April 17, 2008
300 wpc in a small lightweight amp
Pros: Workhorse,Excellent Sound,Reliable,Easy To Use,Powerful,Portable

Fantastic amplifier! Bought one a while back & loaned it to my cousin down at I.S.U. He said he ran this for over 100 hours during rush week & no problems at all! This is 425 W at 4 ohm for [$] this is not a Mcintosh amp, but for the price, the construction, reliability, clarity, & ease of operation are top notch! This is a great little power amp. Im still using this for my home power amplifier & plan on buying another model as O like these so much. Great sound, features.
July 12, 2011
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