QSC GXD4 GXD Series power amplifier — 400W x 2 at 8 ohms (non-bridgeable)

Name: QSC GXD4
Brand: QSC
SKU: 907GXD4
Price: 799.99 USD
Availability: InStock

Item # 907GXD4

No matter the type of venue, you need an amp that'll give you plenty of clean power for your music without breaking...

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Crutchfield: Setting up the DSP in QSC GXD amplifiers

QSC GXD4 Get solid power and DSP settings for the best stage presence

No matter the type of venue, you need an amp that'll give you plenty of clean power for your music without breaking...

Item # 907GXD4

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Power up your gig

No matter the type of venue, you need an amp that'll give you plenty of clean power for your music without breaking your back or your wallet. QSC designed the GXD Series amps to deliver ample power to work with the most widely used loudspeakers in the music industry. Its built-in DSP (digital signal processing) lets you adjust for any type of loudspeakers in your setup. Front-panel controls give you quick access to its gain levels and equalization, so you can adjust your stage settings on the fly.

Strong and safe

The GXD4 2-channel amplifier pumps out 400 watts per channel at 8 ohms and 600 watts per channel at 4 ohms. Its class D design and digital limiter ensure that you get maximum output, while still protecting your speakers from being overdriven. This amp includes high- and low-pass crossovers, a 4-band parametric EQ, and signal alignment delay settings, along with 20 presets to give you a starting point to help match your speakers to the amp.

Connections and control

Front-panel controls provide precise gain and DSP adjustments, while the LCD display helps with your amp setup and status. LED indicators keep you aware of signal, input overload, and amp clipping. The GXD4 also offers combination XLR and 1/4" TRS input connectors for your source material, as well as binding posts and NL4 connectors for your speaker cables.

Product highlights:

General Information:

2-channel power amplifier
power output:
- 400 watts RMS per channel at 8 ohms
- 600 watts RMS per channel at 4 ohms
frequency response: 20-20,000 Hz (+0.7 dB, -0.8 dB)
signal-to-noise ratio: 100 dB
total harmonic distortion: <1.0% (1 kHz)

Features:

rotary encoder knobs for gain and DSP parameter control
DSP includes high and low-pass filters, 4-band parameteric EQ, limiting, and delay
digital limiting protects amp from overheating and overdriving
RF, DC voltage, short circuit, and thermal protection
front-panel LEDs indicate signal presence, clipping, and input overload
integrated rack mount ears

Connections:

inputs: balanced XLR and 1/4" TRS
outputs: binding posts and NL4 connectors

Other Information:

dimensions: 19"W x 3-1/2"H x 10-1/4"D (2 rack spaces)
weight: 11.3 lbs.
warranty: 3 years
MFR # GXD4
Item # 907GXD4

What's in the box:

QSC GXD4 owner's manual

2-Channel power amplifier
5' AC power cord (3-prong IEC)
Quick Start Guide
Warranty Registration information

Featured video:

Researched by Crutchfield's Russ B.

Features & specs

General
Number of Channels	2
Power Class	D
Watts per channel 8 ohms	400
Watts per channel 4 ohms	600
Watts per channel 2 ohms	---
Watts bridged	---
Fan cooled	Y
DSP	Y
Filters	Hi- / Lo-pass
Rack spaces	2
Height (inches)	3-1/2
Depth (inches)	10-3/16
Width (inches)	18-15/16
Weight	11.3 lbs
Inputs
RCA	---
1/4"	2
XLR	2
Outputs
1/4"	---
Binding post	2
Spring post	---

Product Research

Features

Overview: The QSC GXD series of 2-channel amplifiers are optimized for 8 and 4 ohm speaker loads, and feature special tunings to maximize the performance of the QSC E Series loudspeakers. The amps have a Class D output stage, digital signal processing, high- and low-pass filters, and digital limiting. The GXD 4 is designed to be rack-mounted and takes up 2 RU (rack units).

Power Output: The GXD 4 amplifier's output power is rated as follows in stereo mode, both channels driven:

8Ω Continuous: 400 watts
4Ω Continuous: 600 watts
8Ω Dynamic: 600 watts
4Ω Dynamic: 800 watts

Inputs: The GXD 4 features a pair of balanced XLR inputs and a pair of 1/4" jacks that will accept either balanced TRS or unbalanced TS inputs. The balanced inputs can be used for long or short runs, while the unbalanced inputs should only be used for short runs. The XLR and TRS jacks are connected internally and provide feed-thru to the other connector.

Speaker Outputs: The GXD 4 is equipped with a pair of professional NL4 speaker terminals and two pairs of binding post speaker terminals for mono and bi-amp speaker connectivity.

Independent Gain Controls: The GXD series amplifier offers independent rotary gain controls for Channel 1 and Channel 2. The gain controls provide precise setting and matching of sensitivity.

Digital Signal Processing: The GXD 4 features Digital Signal Processing with a 2.12" x 1" LCD display with 256 x 128 pixel resolution. The DSP can be set as Stereo DSP with changes being made to both channels simultaneously, or DSP A & DSP B with changes being made to each channel independently (except for Input Sensitivity). The DSP controls include:

Crossover:
- High Pass Filter (4th order Linkwitz-Riley), adjustable frequency 20 Hz to 4 kHz
- Low Pass Filter (4th order Linkwitz-Riley), adjustable frequency 60 Hz to 4 kHz
PEQ (Parametric EQ): 4-bands with variable frequency, gain, and bandwidth
Delay: up to 50 msec
Limiter: peak limiter with power, aggressiveness, and impedance selection

Presets: The amplifier features presets that can be used for configuring the output to suit the loudspeaker type:

Loudspeaker Type	DSP Type	High-Pass Filter	Low-Pass Filter
Full Range Satellite	Stereo	20Hz, 80Hz, 90Hz, 100Hz	Bypass
Subwoofer	Stereo	20Hz	80Hz, 90Hz, 100Hz
Monitor	DSP A DSP B	60Hz, 80Hz, 100Hz	Bypass
Monitor	DSP A DSP B	60Hz, 80Hz, 100Hz	Bypass
Subwoofer + Full Range Satellite	DSP A	20Hz	80Hz, 90Hz, 100Hz
Subwoofer + Full Range Satellite	DSP B	80Hz, 90Hz, 100Hz	Bypass
Bi-amp	DSP A	20Hz	1000Hz, 1100Hz, 1200Hz, 1300Hz, 1500Hz
Bi-amp	DSP B	1000Hz, 1100Hz, 1200Hz, 1300Hz, 1500Hz	Bypass
Mono Full Range Satellites	Stereo	50Hz, 100Hz	Bypass

Front-Panel LEDs: The front panel features the following LED indicators: 2 Green Signal LEDs to indicate signal presence, 2 Red A/D Clip LEDs indicate input over-drive and/or amplifier current clipping, and a Blue Power LED ring around the power button to indicate power is on.

Cooling Fan/Ventilation: The amp features an internal fan to move air through the chassis and out of its front- and rear-panel vents to reduce internal temperatures. The fan has a variable speed that increases or decreases based on the amount of usage.

Protection: The GXD 4 has protection circuitry against short circuits, open circuits, thermal, RF, and DC faults.

Specifications:

Frequency Response: 20Hz - 20kHz (+0.7 dB, -0,8 dB)
Distortion: < 1% THD
Maximum Input Level: +23.5 dBu
Signal-to-Noise Ratio: 100 dB (A-weighted, 20Hz-20kHz)
Input Sensitivity: 1.2 VRMS, 3.9VRMS
Voltage Gain (8Ω): 33.5 dB
Dynamic Headroom: 1.25 dB
Damping Factor: 100
Input Impedance: 20k (balanced), 10k (unbalanced)
Dimensions: 18.9375" W x 3.492" H x 10.18" D
Weight: 11.3 pounds

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2 questions already asked

How do I go up on the GXD 4 QSC amp?

linster Aug 17, 2022

1 answer

I'm not quite sure what you mean by "go up" Linster, but I'll try to answer for you! If you need more power or an upgrade from the QSC GXD4 essentially going up on performance you can use this QSC GXD8 unit in the link below. This is twice as powerful and has the same smorgasbord of DSP control, a sure winner! If you need to "go up" by cranking up louder, that is controlled by the two gain knobs on the front panel. I hope this helps! https://www.crutchfield.com/p_907GXD8/QSC-GXD8.html

bo Aug 17, 2022 (Staff)

Is there a Fan in amp?

russell Jun 06, 2022

1 answer

Greetings Russell, and thank you for your question. It has a variable speed fan built in that adjusts automatically based on the usage of the amplifier.

thomas Jun 07, 2022 (Staff)

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