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GX Series Overview

QSC

collapse expand iconDescription

The QSC GX3 Stereo Power Amplifier delivers maximum performance for professional entertainers seeking an affordable, lightweight solution. QSC engineers optimized the GX3's power and appearance while reducing cost and weight, creating an amplifier ideal for speakers around 300W. With outputs optimized for popular 4 and 8-ohm loads, the rackmountable GX3 provides maximum headroom and power.

Flexible, Entertainer-Friendly Inputs and Outputs

The GX3's XLR, 1/4" TRS, and phono inputs ensure compatibility with any source. Speakon combo jacks accept 1/4" TS plugs or 2 or 4-pole Speakon plugs, connecting two poles only. Binding posts support other wiring systems.

Cooling System Provides Efficient, Reliable Performance

QSC's grounded collector output and true Class-B biasing maximize the GX3's thermal efficiency and audio quality. Detented gain controls allow precise sensitivity adjustment and matching.

Safeguard Your Investment with GuardRail Protection

QSC's GuardRail technology protects the amplifier and speakers from damage due to overheating or overdriving without interrupting your performance. Front-panel LEDs monitor power, signal, and clipping to give you full control over your sound.

Flexible Crossover and Compact Design

A built-in subwoofer/satellite crossover provides flexibility, while the GX3's 10.1" depth fits in standard racks. Lightweight and compact, the GX3 delivers professional quality you can take anywhere.

QSC GX3 Stereo Power Amplifier
QSC GX3 Stereo Power Amplifier
QSC GX3 Stereo Power Amplifier

collapse expand iconFeatures

  • 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 26 lb. (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

collapse expand iconSpecs

Power Rating
  • 8 ohm / both channels driven / 1kHz: 300W
  • 8 ohm / single channel driven / 1kHz: 350W
  • 4 ohm / both channels driven / 1kHz; 425W
  • 4 ohm / single channel driven / 1kHz; 500W
  • 2 ohm / both channels driven / 1kHz; 200W
  • Distortion (typical): 20Hz–20kHz: 1dB below rated power 8 ohm: less than 0.05%/4 ohm: less than 0.1%
  • Signal to Noise: (20Hz–20 kHz) 100dB
  • Input Sensitivity: 1.2 Vrms
  • Voltage Gain: (8 ohm) 32.2dB
  • Output Circuitry: Class B
  • Power Requirements: (1/8 power, pink noise at 4 ohm, 120V) 6.3A
  • Frequency Response: 20 Hz–20 kHz, +0, 1dB
  • Dynamic Headroom (4 ohm): 2dB
  • Damping Factor: 100
  • Input Impedance (ohm): Greater than 20k (balanced)
  • Maximum Input Level: +24dB (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 -35dB
  • 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 lb. (11.5 kg) Agency Approvals: UL, CE, RoHS/WEEE compliant

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collapse expand iconReviews

4.95

21 Reviews

100%

of respondents would recommend this to a friend

20514030201
Filters
Best Uses
  1. Pro Audio / DJ / Mixing3
  2. Outdoor Events / Games2
  3. Performances2
  4. Amateur Recording1
  5. Home Studio1
Describe Yourself
  1. Professional Musician3
  2. Experienced2
  3. Novice2
Pros
  1. Excellent Sound6
  2. Easy To Use5
  3. Good Power Output5
  4. Portable3
  5. Warm / Comfy2

Reviewed by 21 customers

  • Clean and solid performer

    5

    submitted3 years ago

    byFletcher

    fromWichita, Kansas

    Powers the Rolands V-12's very well through older JBL passive p.a. speakers. Whether on stage or at rehearsal the QSC does its job very well. Have only had it a month but a winner so far.

  • Very Nice

    5

    submitted5 years ago

    byMC

    fromFL

    Worked out great for my Subwoofers.

  • Sounds Great, Looks Nice and it won't bite!

    5

    submitted5 years ago

    byBassHog

    fromSowMo

    I bought mine to run my Sans Amp GED-2112 thru and power 2 x 115" Fender cabs

  • GX3 Stero Amp survery

    4

    submitted5 years ago

    byDJ Vas

    fromAurora, Colorado

    I am a DJ and use it to power speakers. It is great.

  • Amplified

    5

    submitted6 years ago

    byJessie

    fromTehachapi

    I own a restaurant and have 4 each 8 ohm 250 watt speakers and I bought two of these units to power them up. They work great.

  • Does what it says

    5

    Verified BuyerVerified Buyer

    submitted7 years ago

    byDavid

    fromundisclosed

    QSC GX3 really amplified the stereo power

collapse expand iconQ&A

Have a question about this product? Our expert Gear Advisers have the answers.

  • submitted10 months ago

    asked bySean

    fromundisclosed

    Does this product have a 1/4" output?

    Does this product have a 1/4" output?

    Open Reply - Gear-Support
    Yes it does. There's a picture on the back.

  • submitted2 years ago

    asked byAlex

    fromWhittier, Ca,

    Is This is power amp mainly for live performances? If so, what do you have in terms of stereo power amps for a small home studio?

    Is This is power amp mainly for live performances? If so, what do you have in terms of stereo power amps for a small home studio?

    Open Reply - Thomas
    No. It's simply power. There are no rules. It will mostly depend on your speakers.

  • submitted5 years ago

    asked byTopper

    fromMemphis, Tn

    How many volts does this amp have?

    How many volts does this amp have?

    Open Reply - Beau
    Input Voltage, 120 V

  • submitted6 years ago

    asked byDesmond

    fromMaplewood NJ

    Can i connect 2 sets of speakers to this amp? My Yahama A 100 died , this amp had connections for Speaker A & Speaker B

    Can i connect 2 sets of speakers to this amp? My Yahama A 100 died , this amp had connections for Speaker A & Speaker B

    Open Reply - Ronald
    Thank you for reaching out to us. Unfortunately we need some more info before we can give you a for sure answer. Please give us a call at 866-498-7882 and we can get you squared away.