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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 de...Click To Read More About This Product

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OVERVIEW

Maximum performance at a modest price plus flexible I/O.

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.

FEATURES
  • 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
SPECIFICATIONS
  • 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
Reviews
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Review Snapshot

by PowerReviews
QSCGX3 Stereo Power Amplifier
 
4.9

(based on 25 reviews)

Ratings Distribution

  • 5 Stars

     

    (23)

  • 4 Stars

     

    (2)

  • 3 Stars

     

    (0)

  • 2 Stars

     

    (0)

  • 1 Stars

     

    (0)

100%

of respondents would recommend this to a friend.

Pros

  • Easy to use (7)
  • Excellent sound (6)
  • Good power output (6)
  • Warm / comfy (6)

Cons

No Cons

Best Uses

  • Performances (7)
  • Outdoor events / games (5)
  • Pro audio / DJ / mixing (5)
  • Amateur recording (4)
  • Home studio (3)
    • Reviewer Profile:
    • Experienced (6)

Reviewed by 25 customers

Displaying reviews 1-20

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(15 of 15 customers found this review helpful)

 
5.0

Hi Fi Workhorse

By Al Simons

from Michigan

Comments about QSC GX3 Stereo Power Amplifier:

Had this for four years now ( as of 2011)It stays on constantly in my little teaching studio four days a week, then goes to gigs every weekend. It powers two QSC full range speakers ( in stereo) both in the studio and live. It also sees use as the power amp for a guitar rig when I do LOUD outdoor gigs or BIG theaters. The fidelity is as close to a perfect flat response I've ever seen. I bench tested when new it and continue to test once a year to confirm performance or to demonstrate it to students and friends. It still performs like new after four years of continuous service with no degradation of fidelity or power.The single issue I had with mine was the loud fan. A quick call to QSC got a person on the phone and a replacement within three days; no charge. I own Crest, Crown ( the american made Crowns!) and QSC amps. They're all good! But this QSC performs with the best and costs a lot less. It is my "go-to" solution for guitar rigs and small PAs. It never lets me down. It sounds great. I'm very satisfied with this product and the service I got from QSC.

(8 of 12 customers found this review helpful)

 
5.0

4 years strong, loud, clean

By Anonymous

from Undisclosed

Comments about QSC GX3 Stereo Power Amplifier:

In my four years of almost daily use, this amp still bench-tests at stated specs. It has powered low-ohm nightmare-subs, full-range PA speakers, guitar rigs, keyboard rigs and studio monitors. It sounds superb and has never even hinted it might fail. I've run it outside in the hot sun. It has spent grueling hours in frozen vans, then immediately powered-up to drive TWO 4 x 12" cabs. Damn... this thing ROCKS!The only maintenance I've given it is to blow out the dust from the cooling-vents one a year with a shop-vac. Considering the smoky, filthy nightclubs it usually works in, it should have died long ago... but it won't die. Seriously... this is one of the best amplifiers on the planet and the price is SO low for this level of performance. For the three-bills I paid over four years, I figure this cost me less than 25-cents a day. That strikes me as a solid value since it EARNS money every night.One gripe: I had a loud fan with mine. That usually was not a problem except in a quiet environment, like a studio. I called QSC, got a real person on the phone in less than 1 minute. He sent me a new fan for free. Super-sound-qualitygreat service,6-year warranty,only three bills andas reliable as the lies of Fox news.THAT is impressive!

(5 of 7 customers found this review helpful)

 
5.0

Great little amp

Comments about QSC GX3 Stereo Power Amplifier:

Great little amp worth the price. Has great power and sound. Brings my keyboards and organs to life. Would recomend this amp to all. Get one today.

(4 of 4 customers found this review helpful)

 
5.0

SOLD ON QSC!

By The guitar guy

from North Dakota

See all my reviews

Comments about QSC GX3 Stereo Power Amplifier:

The sound quality it there with this amp. I'm sold now on QSC and will buy only their amps for any future needs.
I had some extra rack equipment sitting around so I put together a stereo system for my party room. This amp was perfect. I'm runing a mono signal and using the bi-amp function to power two PV118 cabs and two Peavey 15 inch monitor speakers. For pre-recorded music, it's a great set-up. The party room shakes when I turn up the lows. I'm very happy with the quality of this amp. The price was great for what you get.
Well built.
425 watts per side at 4 ohms with bi-amp 100 hz x-over for this price!

(4 of 4 customers found this review helpful)

 
5.0

QSC GX3 Stereo Power Amp

By Chris LaPlante

from Connecticut

Comments about QSC GX3 Stereo Power Amplifier:

I think the amp is perfect for a medium to large venue/audience setting. It's not too heavy and doesn't take up a lot of space.
I would definitely recommend this amp to anyone who needs some power for their speakers and who is on a budget.
The features are what you expect to find on most modern amps. Haven't had a need for the built in 100 Hz crossover, but when I decide to buy a separate sub I will definitely use it. The one feature I would add is handles on the front for easier mounting.
Built tough, and capable of handling tour use. Love the optional rear rack mounts. The sound quality is crisp and clean. I use the GX3 with a couple of Bose 802's and I just love the sound that it puts out.
Just the right amount of power for my needs without having to sell a kidney to get it. Great value.

(3 of 3 customers found this review helpful)

 
5.0

Clear with punch!

By Rocker_103

from Mason, OH

About Me Professional Musician

See all my reviews

Ask me a question

Verified Buyer

Pros

  • Affordable
  • Easy To Use
  • Excellent Sound
  • Good Warmth
  • Portable
  • Powerful

Cons

    Best Uses

    • Events
    • Mobile DJ
    • Performances
    • Rehearsal PA

    Comments about QSC GX3 Stereo Power Amplifier:

    I've had this amp for a couple of weeks now & it's doing a great job so far. I bought this one to replace my very old Peavey CS400 for pushing the mains (Kustom KPC215H 2X15 PA Cabinet Pair) I use for rehearsals, & while teaching guitar 2 days a week from my home.

    I mostly selected the GX3 because of the choices it gives me with the in/output section, plus more power than the Crown I was comparing it to which sells for the same price. The only plus to the crown was the weight of only around 10 lbs vs the QSC's 25 lbs. But in all other ways, this won.

    So far the amps doing a great job, especially since I upgraded my cables going from the outputs on my Tascam mixer to TRS, which is what this amp needs to really sound it's best. The old TS cables worked great with the old amp, but this required the upgrade.

    As others have mentioned, I do hear a more distinct sound coming from the fan in this amp. While I wouldn't call it loud, it is more noticeable, but the fans about half the size in this amp compared to the old one. A higher more noticeable pitch is understandable I suppose.

    Only time will tell how well the GX3 will hold up. I'm hoping it lasts as long as my Peavey did. I bought it used in 1983!

    (3 of 3 customers found this review helpful)

     
    5.0

    GX3 Review

    By Albatross

    from Milwaukee, WI

    About Me Experienced

    See all my reviews

    Ask me a question

    Pros

    • Easy To Use

    Cons

      Best Uses

      • Events
      • Performances

      Comments about QSC GX3 Stereo Power Amplifier:

      So far I have not experienced any of the fan noise that some other reviewers complained about. The GX3 is used to power our floor monitors, and does an excellent job, with no unwanted noise that I can detect. Sound quality is very good and although this amp isn't terribly powerful, it's easily powerful enough to run the monitors.
      One thing I like about this that helped me decide to buy this over some others is the ease of use. Some other power amps require various different types of plugs, and if you don't have speaker cables with those plugs, you have to spend money on adapters. With the QSC, I can plug my regular 1/4 inch speaker cables right into the power amp and not worry about adapters or having the right type of cable handy. I like making setup and tear down easy, and this amp is very easy to run. Basically just plug it in, turn it on, and you're ready. Larger bands or larger venues may want to consider getting the next step up with more power, but for our band, this works nicely.

      (3 of 3 customers found this review helpful)

       
      5.0

      New QSC fanboy

      By Joe Schubel

      from Milwaukee, WI

      Comments about QSC GX3 Stereo Power Amplifier:

      I started looking around for a performance power amp that was in between crown and Behringer. Now while I consider Crown the holy grail of power amps, I didn't feel like spending the cash for the Harley-Davidson of power amps. So when looking, I actually took a look at this site and their most popular power amps. To me, the majority of the people that visit this site have their head screwed on straight and care about quality products. While a lot of the reviews showed promise for Behringer, my cousin and I currently employ a tube based preamp in my studio, and while it worked flawlessly in the beginning, all the pot's on my preamp are now fuzzy and buzzy. His preamp sucked from day one, buzzing at 60Hz, requiring post process filtering which saps the nuances out of the recording. To sum up my opposition to Behringer, I didn't feel like getting a product that worked well for a year or two, though I just bought a Behringer 8-channel mixer to go with it ($60 and not regretting it yet, but we'll see)Hooking it up to my 6.5" jbl studio s26-ii's, I was blown away by its punch and clarity. Mind you, its normally being driven by an 80W/ch Onkyo (0.08%THD). The speakers had more dynamic to the sound, and it was absolutely fantastic. I had done this while I awaited the arrival of my MTX PA speakers.I bought a pair of MTX TP2400 to go along with it. They are definitely not the greatest speaker out there, but they put out the high SPL sound I was looking for in a live performance. The amplifier drives them pretty well, though I cant help but be slightly disappointed with the result. I am confident that the amp is not the culprit though due to how well it has driven my other smaller studio speakers.I think these cheap PA speakers really show the beauty of the amp though, Its speaker/clipping protection made the music stay at uninterrupted high levels. The other great thing is the 6 year transferable warranty. While I don't really care too much about warranties, Behringer's abysmal 1 year warranty pushed me over to QSC. That's pretty much saying what I think about my current products, they know its too risky to warranty a product longer than a year.I hope you find this info useful, because these guys deserve every sale they get.

      (3 of 4 customers found this review helpful)

       
      5.0

      Amazing

      By SoundGuy23

      from Fort Collins

      See all my reviews

      Comments about QSC GX3 Stereo Power Amplifier:

      I purchased the this amp about a year ago from here that was in a like new condition. I had a gig that was outside that ran for 8 hrs in 95 degree weather. I used this amp in conjunction with a Peavey 1500 and a Yamaha EMX312SC. The Peavey amp and the Yamaha went into thermal overload and stopped working. This QSC was the only one that worked. Its has minimal static noise when at idle and continues to impress me!

      (2 of 2 customers found this review helpful)

       
      5.0

      thay've done it again...

      By 1 sound man

      from fayetteville, nc

      See all my reviews

      Ask me a question

      Verified Buyer

      Comments about QSC GX3 Stereo Power Amplifier:

      this one runs a pair of PV118 subs and the GX5 runs a pair of PV215s for the mains...we have enough sound for any small to medium venue...thanks goes to musicians friend for the great deals and QSC for a quality product! the shallow rack mount is a plus when buying (and carrying) rack cases ;-)

      (2 of 2 customers found this review helpful)

       
      5.0

      Nice Pro Amp does the job

      By K-Kerry

      from Bay Area

      About Me Professional Musician

      See all my reviews

      Pros

      • Easy To Use
      • Excellent Sound
      • Good Warmth

      Cons

        Best Uses

        • Events
        • Performances

        Comments about QSC GX3 Stereo Power Amplifier:

        I bought one of these to power some JBL MR series PA cabinets with 15's for vocals for my band and am very pleased with it. Clean design & quiet.

        (2 of 2 customers found this review helpful)

         
        5.0

        So Far So Good

        By journeyman21

        from Orlando Fl

        About Me Experienced

        Verified Buyer

        Pros

        • Extra Clean

        Cons

          Best Uses

          • Amateur Recording
          • Home Studio
          • Mobile DJ
          • Modeling Processor Amp
          • Performances
          • Professional Recording

          Comments about QSC GX3 Stereo Power Amplifier:

          Sounds really clear at any volume. Will Drive Your 300 watt speakers

          (2 of 2 customers found this review helpful)

           
          5.0

          Legendary QSC quality, bargain price

          By Zippo the Heavier

          from markle

          See all my reviews

          Comments about QSC GX3 Stereo Power Amplifier:

          Sounds great for hi fi listening in my studio.Bench tests better than stated spec.Used it live with several speakers systems. Performs well at 4 ohms with no thermal issues or sonic degradation.I am not knocking Crown, Crest or Mackie, because they make good stuff too. I have used and owned them all. QSC is the best in this range.This and the new PLX series are the best performance-to-dollar amps on the market. PLUS! MUCH less weight!Pro tip for PLX series: If you do NOT need ridiculous 2-0hm ratings, buy any model-number that ends in "04" If you enjoy torturing amps and operate amateurish unstable 2-ohm speakers systems, QSC amp-models that end with the number "02" are up to the task.Besides the legendary dependability, sound-quality and professional-features of these amps, QSC publishes honest complete specifications and (most importantly) does not charge extra for those low-ohm, current-sucking transformers that most informed pros would never use anyway. That means you are not paying for the unused features that only the ignorant need.

          (2 of 2 customers found this review helpful)

           
          4.0

          Clean power, loud fan

          By MtBiker

          from Undisclosed

          Comments about QSC GX3 Stereo Power Amplifier:

          I bought a GX3 to power some high end home speakers with horrendously low sensitivity. I have owned several audiophile amps and like the fact that $300 can buy so much clean power, but the fan in the GX3 is really unacceptably loud for home use. According to QSC tech support, the fan is temperature controlled, but it idles like an outboard motor. A decent PWM fan could have covered the range of cfm necessary at different drive levels. In retrospect, I regret this purchase.

          (1 of 1 customers found this review helpful)

           
          5.0

          Good Choice - Easy to use powerful amps

          By bkbrocks

          from Bentonville, AR

          About Me Experienced

          See all my reviews

          Verified Buyer

          Pros

          • Easy To Use
          • Excellent Sound
          • Good Warmth
          • Portable
          • Powerful

          Cons

            Best Uses

            • Performances

            Comments about QSC GX3 Stereo Power Amplifier:

            I have used Mackie power for years and it was time to replace my 15yr old Mackies. I teamed up with a Driverack, and wanted to get a well aligned, clean, powerful, easy to hook and go power amps for my front of house. I looked and studied for months. I soon settles on the GXs form QSC. Great amp which has clean power to drive my EV Eliminator subs and tops. I have two EV Eliminator subs and tops on both side of the stage. This is for top 40/classic rock/original rock band. The GX3 drives the tops at 4ohms and the GX5 drives the subs @ 4ohms with great efficiency. No problems from me. The GX5, and GX3 has all the clean power I'll ever need.

            (1 of 2 customers found this review helpful)

             
            4.0

            Great AMP

            By DC Karaoke

            from Galveston, Texas

            About Me Experienced

            Verified Reviewer

            Pros

            • Excellent Sound
            • Good Warmth
            • Powerful
            • Rugged Construction

            Cons

              Best Uses

              • Amateur Recording
              • Events
              • Karaoke shows
              • Mobile DJ
              • Professional Recording

              Comments about QSC GX3 Stereo Power Amplifier:

              I bought this amp, only needing a small amount of power but it quickly surprised me. I have run this with both Berhinger 15' speaks, and a pair of Peavy dual 15' towers. Worked great for both. Only buying a new one because user errors... Meaning one drink fan and a pitcher of beer is never good for your amps life expectancy :D Great product!

              (1 of 1 customers found this review helpful)

               
              5.0

              Great Amplifier

              By Mitch-ZeLj9

              from PITTSBURGH

              About Me Experienced

              See all my reviews

              Ask me a question

              Verified Buyer

              Pros

              • Easy To Use
              • Excellent Sound
              • Good Warmth
              • Great sound
              • Powerful

              Cons

              • None

              Best Uses

              • Loud sound
              • Mobile DJ

              Comments about QSC GX3 Stereo Power Amplifier:

              Amp is still heavy but I was able to reduce what I carry due to this unit have great power. I now have to watch that I don't blow my speakers. Great Amp.

              (1 of 1 customers found this review helpful)

               
              5.0

              Super Clean and Powerful

              By Writter/Player/Man

              from New Haven, CT

              See all my reviews

              Comments about QSC GX3 Stereo Power Amplifier:

              I bought this unit as a replacement to power my PA system. Sometimes the advertised wattage with some companies is not what you end up with when you read the fine print, but I can tell you you get a full 300W of clean power with this guy. I'm running four cabinets and this thing has power to spare. I am now a fan of QSC. Great Amp for the Money!

              (1 of 1 customers found this review helpful)

               
              5.0

              Great value

              By quesoso

              from Berkeley, CA

              See all my reviews

              Comments about QSC GX3 Stereo Power Amplifier:

              A lot of power for the price. The amp feels very sturdy, its fairly light, and it sounds great. The customer support is excellent-I called QSC with a quick question about the input wiring and was able to talk with a knowledgeable tech right away.

              (1 of 1 customers found this review helpful)

               
              5.0

              NICE HEAD

              By Mobilervdj

              from Benson, Az.

              See all my reviews

              Comments about QSC GX3 Stereo Power Amplifier:

              Got this GX3 to power a pair Gemimi Dueal 15 3-ways. Works Great. plane to upgrade in 6 mos. And then use GX3 to power Subs. Buy this you can't go wrong. Very Nice Power Head.

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