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QSC GX3 Stereo Power Amplifier

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The QSC GX3 Stereo Power Amplifier is ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers have optimized output and appearance of the... Read More

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The QSC GX3 Stereo Power Amplifier is ideal for professional entertainers who require maximum performance and portability on a limited budget. QSC designers have optimized output and appearance of the GX3 power amp while reducing raw material cost and weight. The rackmount GX3 power amplifier is ideal for speakers in the 300W (Program) range and supplies maximum possible power to 4 ohm and 8 ohm loads.

The GX3 power amp uses the latest QSC Grounded Collector output system for optimum cooling of the critical power transistors. The GX3 power amp's true Class B biasing system combines maximum thermal efficiency with excellent audio performance.

  • Power levels matched to the most popular speakers used by entertainers
  • Optimized for maximum real-world headroom into 4Ω and 8Ω 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 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
  • Power Rating:
  • 8Ω / both channels driven / 1 kHz: 300 W
  • 8Ω / single channel driven / 1 kHz: 350 W
  • 4Ω / both channels driven / 1 kHz; 425 W
  • 4Ω / single channel driven / 1 kHz; 500 W
  • 2Ω / both channels driven / 1 kHz; 200 W
  • Distortion (typical): 20 Hz - 20 kHz: 1 dB below rated power 8Ω: less than 0.05% / 4Ω: less than 0.1%
  • Signal to Noise: (20 Hz - 20 kHz) 100 dB
  • Input Sensitivity: 1.2 Vrms
  • Voltage Gain: (8Ω) 32.2 dB
  • Output Circuitry: Class B
  • Power Requirements: (1/8 power, pink noise at 4Ω, 120 V) 6.3A
  • Frequency Response: 20 Hz - 20 kHz, +0, 1 dB
  • Dynamic Headroom (4Ω): 2 dB
  • Damping Factor: 100
  • Input Impedance (Ω): 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 -35 dB
  • Blue Power LED, AC on
  • Rear Panel Controls: Full Range / Crossover switch
  • 100 Hz, 3rd order LP (sub), 2nd order HP (top)
  • Dimensions (HWD): 3.5" (2RU) x 19" x 10.1" (89 mm x 483 mm x 257 mm)
  • Weight: Shipping / Net 30 (13.5 kg) / 25 lbs (11.5 kg) Agency Approvals: UL, CE, RoHS/WEEE compliant

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews


by PowerReviews

(based on 10 reviews)

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Reviewed by 10 customers

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Great sound


from El Cajon CA

I wanted a rackmount amp for my home studio and bought the GX3. I don't need as much power as the GX3 provides but I like the amp. I was really impressed by the sound quality and the solid construction. What I really like is the volume controls with the detent switches. This provides easy balancing the of the two output channels. I was also concerned about the fan noise but it's really not noticeable during playback. I also like the assortment of connections on the back panel.

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Best bang for the buck

By James Webb

from New York, NY

I have been using QSC amps for more than 25 years. I started to purchase powered cabinets, but needed that raw power and warmth. I have used this GX-3 about 10 times, indoor, outdoor with audiences up to 500. More than enough for my mobile DJ sets. Has not failed me once. I knew once I set the levels, I would not have to check until the end of the gig. Everyone compliments me on my sound and I owe it all to QSC and of course GC.

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(5 of 6 customers found this review helpful)


wow it is a real amp !!!!!!!!!!!!!!!!!!!!

By mike

from seattle wa

it is powerful for my bose 301 bookshelf, it makes my bose sounds good. it is perfectly for KARAOKE !!!!!!!!!!!!!!!!!!!!! thanks QSC for making a good product !!!!!!!!!!!

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(3 of 3 customers found this review helpful)


Beginners Special

By Brody

from Sherman Oaks CA.

I'm fairly new to quality dj equipment. I've been toying around, off and on for the last 20 years or more . I mean, nothing really serious or even close to it. I've been just a fan of great sounding equipment and the different djs I've meet or partied to, out at weddings, parties, and clubs. I bought some really inexpensive junk and thought that it would be just as good as anything out there based on my use. BIG mistake, I just got back into it, after a couple years in the basement, and let me tell you this, if you don't have a lot of coin to spare , this system kicks butt. Whatever you do,(to each his own) don't waste your hard earned money and time with the cheap stuff ever. You will be very disappointed when you hear this thing. My wife has a very critical ear, and when I had the cheap junk, she knew it right away. She complained all the time. But today when I bought this thing home and had trouble lifting it, she knew this wasn't that cheap junk, I had before. Anyway long story short, it's clean,clear, and crisp at low volume, and makes our collection sound like it never has before. It's amazing for the price, it's a steal! Make your old songs sound new again...

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(15 of 16 customers found this review helpful)


Awesome Amp!

By soundguy23

from Windsor, CO

I purchased this amp used. I was very surprised at all the options for both inputs and outputs. I was happy to find there was a built in cross over function at 100hz. It fits in a shallow case so need for a large case. It does not weigh much and takes a beating. I used it outside a couple of times when it was over 100 degrees. I was eveing running it at clip for hours and it did not back down. The fan is loud under that condition but what do you expect under conditions like that. I am looking at another for my monitors!

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(16 of 16 customers found this review helpful)



By ZigArt

from Milford, CT

The Gx3 is a true value. Performance exceeds by a 1000% the cost range of this bass pounding with extreme clarity in all sonic ranges 2 rack space adrenalin fueled amp. Get It! I am getting more of them. Best amp find in years.

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(4 of 4 customers found this review helpful)


Very happy!

By Nick R.

from Muskegon, MI

I bought this amp yesterday because my current Peavey PV 500 stopped working. I cannot believe how powerful and clear this amp sounds! Im running two MTX TP1200's for speakers and this Amp makes a great combo!

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(20 of 20 customers found this review helpful)


Cheap, clean & clear!

By Chris Maione

from Phoenix, AZ

I went to get a Crown amp for my drum monitors and they were in the process of changing over models. I tried this amp and am really impressed. Nice, powerful, clean, clear and with a great price. Would buy this product again and recommend it to new buyers on a budget.

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(12 of 14 customers found this review helpful)


GET ONE!!!! or SOME!!!!!!!

By Pete

from Denver, CO

I bought this is a temporary fix to bi-amplify my Martin Logan Electrostatic speakers, which are brutally revealing. I must tell everyone who's reading this, ............for professional or home amplification YOU WILL NOT BE SORRY!!!!!!!!!!! This amp can hang or smash some of the best in the home audio category, and personally I don't know how they did it other than sound, sincere engineering. QSC you have a customer for life, you pulled off something no one has done in maybe 20 years!

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(24 of 25 customers found this review helpful)


Awesome Buy!

By Daniel Van Weddingen

from Washington, DC

I bought my GX3, took it out of the box, lots of choices for your preference of speaker hook-up. I hooked mine up to two Kustom speakers and "Barely" turned the dial on the Amp....and Wow! is that sound loud and clear. Neddless to say I am very satisfied.......well I guess I would be a little more happy if it came with rack screws....

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