Pricing and availability

We compare 600+ stores and found this item at 7 stores. Prices updated .

Sweetwater
4.5 (25)
$599.99
Guitar Center
5.0 (21)
$599.99
Amazon
4.3 (96)
$599.99 $499.00 $100.99 Used
Reverb
4.0 (5)
$498.00 New
$209.00 Used
B&H
5.0 (10)
$479.99
Thomann
4.6 (101)
$399.00
Gear4Music
£415.00

Average Price: $469

Standard/Professional

$299

$1500+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 4 merchants for "QSC GX3". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

When power, portability, and precision matter for your performances, the QSC GX3 Stereo Power Amplifier stands out as a reliable choice. This 425-watt powerhouse is designed to deliver just the right amount of energy to your speakers while ensuring efficient operation and robust protection. Thanks to its GuardRail technology, you can push your sound to the limits without worrying about overloads or overheating. Whether you're a musician, DJ, or sound engineer, the GX3's versatility and performance make it a must-have in your audio arsenal.

Boasting a flexible input array with XLR, 1/4" TRS, and RCA phono connectors, the GX3 is ready to work with any setup. Its lightweight, compact design allows for easy installation in standard racks, making it perfect for mobile gigs and permanent installations alike. With built-in crossover capabilities, you can effortlessly integrate subwoofers, enhancing your sound's depth and impact. The detented gain controls offer precise adjustments, ensuring your output is always crisp and clear. Experience the blend of professional quality and ease of use with the QSC GX3.

Key Features:

  • Power: 2x 425W at 4 Ohms, 2x 350W at 8 Ohms
  • Inputs: 2x XLR balanced, 2x RCA, 2x 6.3 mm stereo jacks
  • Outputs: Speakon combo jacks, 6.35 mm jack, 2x screw terminals
  • Frequency Range: 20 Hz - 20,000 Hz
  • Signal to Noise Ratio: 100 dB
  • Integrated switchable crossover
  • GuardRail technology for overload protection
  • Lightweight and compact for easy transport and installation

Owner's manual

QSC GX3 User Manual

Product specs

Number of Channels 2
Power Class Class B
Watts/Side @ 8 ohms 300W
Watts/Side @ 4 ohms 425W
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 27 lbs.

FAQs

What type of speakers is the QSC GX3 power amplifier best suited for?

The QSC GX3 is ideal for powering speakers in the 300-watt (Program) range, making it suitable for small to medium-sized live sound setups.

What are the input options available on the QSC GX3 power amplifier?

The QSC GX3 offers versatile connectivity with 2 XLR, 2 1/4" TRS, and 2 RCA input options, accommodating a wide range of audio sources.

How does the cooling system work on the QSC GX3 amplifier?

The QSC GX3 features a variable-speed fan with rear-to-front airflow, ensuring efficient cooling and reliable performance during extended use.

Is the QSC GX3 power amplifier suitable for rack mounting?

Yes, the QSC GX3 is designed to fit in a standard 19-inch rack and occupies 2U of rack space, making it convenient for professional installations.

What are the power output ratings of the QSC GX3 at different impedances?

The QSC GX3 delivers 300 watts per channel at 8 ohms and 425 watts per channel at 4 ohms, providing flexibility for various speaker configurations.

American Musical Supply

American Musical Supply

QSC GX3 425 Watt Two Channel Stereo Power Amplifier - QSC GX3

Video thumbnail for QSC GX3 425 Watt Two Channel Stereo Power Amplifier - QSC GX3 by American Musical Supply

QSC GX3 425 Watt Two Channel Stereo Power Amplifier - QSC GX3

American Musical Supply

American Musical Supply

Video thumbnail for QSC GX3 Power Amp At Home & Fan Mod by IOWAudio Reviews

QSC GX3 Power Amp At Home & Fan Mod

IOWAudio Reviews

IOWAudio Reviews

Video thumbnail for QSC GX3 300 Watt Power Amplifier review and Buying Guide by Outdoorsumo by Indoor Outdoor Lover

QSC GX3 300 Watt Power Amplifier review and Buying Guide by Outdoorsumo

Indoor Outdoor Lover

Indoor Outdoor Lover

Reviews

PROS

  • Long-term reliability proven with continuous operation for over 18 months

  • Excellent sound quality with open and clean audio

  • Maintains linear tonality even at high levels

  • Effective 100 Hz crossover for powering subs and mids/tweeters

  • Compatible with various setups, from DJ to home stereo

  • Robust build quality, offering durability and longevity

  • Easy installation with compatible inputs/outputs

  • Offers good power for mid-sized gigs

  • Cost-effective solution with high performance

  • Versatile application, serving multiple audio needs

CONS

  • Noticeable fan noise, especially at low volumes

  • Heavier compared to Class D amplifiers

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about QSC GX3.

Build quality

  • The power switch on GX series amps is a common failure point due to high inrush currents burning the contacts, often requiring frequent replacements.

    Source

Setup and maintenance

  • Owners recommend checking the output jacks for broken cable ends or mangled speakon terminals, which can short the output.

    Source
  • Visual inspection for loose connectors and flipping the full range/crossover switch back and forth can resolve certain issues.

    Source
  • Canned air is recommended for cleaning dust, but immobilize fans first to avoid damage from overspinning during the process.

    Source
  • Overheating may occur if the amp is overloaded due to improper speaker configurations; ensure correct setup to prevent this.

    Source

Comparisons

  • The GX series is noted for being cheaply made compared to the RMX and CX series, which are considered more robust and reliable.

    Source

User experience

  • Owners report issues with deteriorated filter capacitors, suggesting that the big capacitors should be checked for flatness to diagnose problems.

    Source
  • If the amp displays solid red clipping lights after hours of use, power cycling can temporarily restore function, indicating potential overheating or maintenance issues.

    Source

Use cases and applications

  • Despite its flaws, the GX3 is commonly used in installations due to its affordability and decent performance for the price.

    Source

Features and functionality

  • QSC's tech support is highlighted for their ability to assist with troubleshooting and cleaning procedures over the phone.

    Source

Based on 0 Reviews and 0 Ratings

5 star
4 star
3 star
2 star
1 star

More QSC Power Amplifiers

QSC GX5

$384.99 - $707.29

# 5

Rank

Buzz Osborne (aka King Buzzo) Adam Roethlisberger
2 artists using

Accessories & Related Items

Artist usage

Community setups

Similar

Gear Guides

  • Added to Equipboard on by

    dj_crash
    dj_crash

    Gear IQ 106