QSC GX3 300 Watt 8 Ohm Power Amplifier

Model: GX3

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MSRP: $499.99 ?


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Packaging Info

Package Weight 29.6 lb
Box Dimensions (LxWxH) 24.0 x 14.5 x 6.0"

General Information

Input Sensitivity 1.2 Vrms
Input Impedance Greater than 20k (balanced)
Gain 32.2dB
Frequency Response 20Hz - 20kHz, +0, -1 dB
Signal-to-Noise Ratio 100dB
Total Harmonic Distortion (THD) 8 ohms: less than 0.05%4 ohms: less than 0.1%
Input Connections 3-pin XLR and 1/4" TRS, balanced, parallelPhono, unbalanced
Output Connectors Speakon, 1/4", Binding Posts
Power Rating 8 ohms / 1 kHz (both channels driven): 300W8 ohms / 1 kHz (single channels driven): 350W4 ohms / 1 kHz (both channels driven): 425W4 ohms / 1 kHz (single channels driven): 500W
Controls (Rear) Full Range / Crossover switch100 Hz, 3rd order LP (sub), 2nd order HP (top)
Indicators Red Clip LEDs, proportional, 0.1% THD thresholdGreen Signal LEDs, threshold -35 dBBlue Power LED, AC on
Cooling Not Specified By Manufacturer
Power Consumption 0.2 AC Amps, 44 per hour idleUL, CE, RoHS/WEEE Compliant
Power Requirements 1/8 power, pink noise at 4 ohms, 120V 6.3A
Dimensions (WxHxD) 19 x 3.5 10.1" (483 x 89 x 257mm)
Weight 26 lbs (12 kg)
Specialties Subwoofer/Satellite crossover built-in
Controls Front Panel Gain controls, 21 detentsRed Clip LEDs, proportional, 0.1% THD thresholdGreen Signal LEDs, threshold -35 dBBlue Power LED, AC on
Damping Factor Not Specified By Manufacturer
User Reviews
6 April 2021

Really good clean class B power. I used this bad boy to power a pair of Klipsch 500sa up firing Dolby atmos speakers and it works great! It has built in rack wings in case you were to install it in a media rack which is not removable permanently on the amp and this amp is not bridgeable which is my...

  • +

    -Great 300 watt power per channel-Reasonably priced for what this class B amp offers

  • -

    -Media rack wings is non removable-The channels are Not bridgeable

31 July 2016

I am a physicist. (energy physics not matter physics). I am also a sound engineer, coincidentally, the control of sound energy. This amp is VERY GOOD for bench testing audio control devices and speakers. The addition of an unbalanced input makes it very handy for typical bench tests.

15 February 2016

Great device, easy setup. Good true sound produced by the amplifier. The only little thing is that if you put out a low volume, you hear the cooling fan running.

12 January 2015

This amp sounded great, and produced just the kind of power I was looking for. My only issue with it was that the fan is really noisey, if you have a sound proof cabinet you will be fine but if not, this amp will distract you

15 April 2018

This amplifier has the power and quality I was looking for.It is also much lighter than the old amplifier that it replaced.

11 January 2017

I am the facility director at a large health club.... We have used this brand amplifier in our Spinning, Yoga and Aerobics studios... When paired up with a Shure wireless mic and a rolls mixer you will have Great long lasting pro audio

3 February 2015

Bought this to replace an old amp with a bad channel. Used for overflow speakers in our church lobby ceiling. Inputs and outputs were totally compatible with our system's existing wiring, making it a simple hook-up. It worked perfectly right out of the box.

19 June 2019

As noted in other reviews the fan is a bit noisy. In my case that's not a big deal as my amps & other equipment are in a separate room from the home theater but it's definitely audible if you're near the rack.

  • +

    Low cost, high power

  • -

    Noisy fan

24 August 2014

Purchased three years ago, I do not regret it. The sound is good, the device compact, rack mountable in 19 'and has a connector adapted to (almost) all possibilities. Only drawback, at a party, it is put repeatedly safe (both channels) while he was on for a short time and at half power.

24 August 2014

Very good amp, many possible connections, compact and in rack 19 '.

Product Highlights
  • Optimized for 4 and 8 ohm Speakers
  • XLR, 1/4" TRS and Phono Inputs
  • Speakon® Combo Outputs
  • Subwoofer/Satellite Crossover Built-in
In The Box
  • QSC GX3 300 Watt 8 Ohm Power Amplifier
  • 3-Year Warranty
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