QSC GXD 4

Power Amplifier(1500W)

Overview

GXD Series amplifiers are ideal for entertainment and production applications requiring performance and the convenience of integral signal processing. The hallmarks of the QSC brand – professional audio quality, engineering and manufacturing focused on long-term reliability - are all intrinsic to GXD. Add contemporary styling, multiple routing options, light weight, digital signal processing and advanced protection circuitry, and the GXD Series clearly represents real value – something everyone can use. The GXD series is optimized for use with 8 and 4 ohm loudspeaker loads. GXD amplifiers deliver just the right amount of power to the most popular speakers used by entertainers and production professionals.

The GDX 8 from QSC is a professional power amplifier designed for professional PA systems utilizing speakers with 4 and 8 ohm loads and a maximum output of 4500W. The GDX 8 employs a class D output stage with a universal power supply for high performance and efficiency, while keeping the unit lightweight at 13.2 lbs. The integrated DSP section includes High and Low-Pass filters (24 dB LR), 4-band parametric equalizer, signal alignment delay, and RMS/Peak speaker protection limiting.

The parallel XLR and 1/4" TRS input connectors offer broad compatibility with convenient loop-through capabilities, while the professional binding posts and NL4 connector provide mono and bi-amped speaker connections. In addition to the limiting offers on the inputs and outputs, the GDX employs smart speaker protection by providing settings for the loudspeaker's continuous output and impedance (4 ohm or 8 ohm). The GDX 8 ships with a standard IEC power cord.

Features

High peak output power with up to 1600 watts from the GXD 4 and a whopping 4500 Watts from the GXD 8.

Power levels matched to the most popular loudspeakers and optimized for maximum real-world headroom into 4Ω and 8Ω speaker systems.

Class D output stage with a universal power supply for high performance and efficiency.

Extensive and powerful loudspeaker processing built in. Includes high and low-pass filters, 4-band parameteric EQ, limiting, and delay.

Large LCD display simplifies amplifier setup and indicates amp status.

Inputs: Parallel XLR and 1/4” TRS connectors for compatibility with any source while providing convenient loop-thru capability.

Precision rotary encoders for gain and DSP parameter control.

Outputs: Professional binding post and NL4 connectors (compatible with NL2) provide for mono and bi-amp speaker connections.

Digital limiting automatically protects the amplifier from damage due to temperature rise or overdrive.

Adjustable speaker protection to match your loudspeaker’s power and impedance.

Front panel LEDs indicate signal presence, input overload, and amplifier clipping.

Specification

GXD 4

GXD 8

8Ω dynamic, both channels driven


600 watts per channel


1500 watts per channel

4Ω dynamic, both channels driven

800 watts per channel

2250 watts per channel

8Ω continuous, both channels driven

400 watts per channel

800 watts per channel

4Ω continuous, both channels driven

600 watts per channel

1200 watts per channel

Distortion (typical)
1 kHz at full rated power

< 1% THD

Signal to Noise
(A weighted, 20 Hz–20 kHz)

100 dB

Input Sensitivity

1.2 Vrms, 3.9 Vrms

Maximum Voltage Gain

33.5 dB

36.5 dB

Output Circuitry

Class D

Power Requirements

1/8 power at 4Ω

- 100 V AC

3.4 A

6.2 A

- 120 V AC

2.9 A

5.6 A

- 230 V AC

1.6 A

3.2 A

Frequency Response
(20 Hz–20 kHz)

+0.7 dB, -0.8 dB

Dynamic Headroom (4Ω)

1.25 dB

2.73 dB

Damping Factor (8Ω)

100

Input Impedance

20 kΩ (balanced), 10 kΩ (unbalanced)

Maximum Input Level

+23.5 dBu

Input Connectors
(each channel)

3-pin XLR/F / 1/4" TRS, balanced

Output Connectors
(each channel)

NL4, binding posts
NL4 pinout:
•  Channel A on 1+, 1-; Channel B on 2+, 2-
•  Channel B on 1+, 1-

Amplifier and Load Protection

Short circuit, open circuit, thermal, RF protection
Load protected against DC faults

Front Panel Controls and Indicators

2 × Rotary Encoders
3 × Operational buttons (HOME, ENTER, EXIT)
2 × Green Signal LEDs indicate signal presence
2 × Red A/D Clip LEDs indicate input over-drive and/or amplifier current clipping
Blue Power LED ring indicates AC on
2.12" × 1.0", 256 × 128 pixel LCD

DSP Functions

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
4-band parametric EQ with variable frequency, gain, and bandwidth
Peak limiter with power, agressiveness, and impedance selection
Delay 50 msec max.

Dimensions (HWD)

3.5" (2 RU) × 19" × 10.2" (89 mm × 483 mm × 259 mm)

Weight (Net)

11.3 lb (5.1 kg)

13.2 lb (6.0 kg)

Weight - Shipping

15.4 lb (7.0 kg)

17.3 lb (7.8 kg)