QSC GXD 4 User Manual Download Page 4

4  (DRAFT 2015/20/07)

 

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TD-000450-01-A

Introduction

The GXD Class-D amplifiers have been engineered for high performance output and optimized for maximum real-world headroom into 4

 and 8

 

loudspeaker systems. The power levels of the GXD amplifiers are matched to the most popular loudspeakers:

•  GXD 4, per channel – 400 W into 8

, and 600 W into 4

 (1600 W peak)

•  GXD 8, per channel – 800 W into 8

, and 1200 W into 4

 (4500 W peak)

The Class-D amplifier topology is very efficient, making the GXD amplifiers small and light. In addition the Universal Power Supply used in the 
GXD helps to reduce weight. Both amplifiers are 2RU and are only 229 mm (9 inches) deep. The GXD 4 weighs in at 5 kg (11 lbs), the GXD 8 is at 
5.9 kg (13 lbs).

The GXD amplifiers have an LCD for control and monitoring, with three buttons for menu navigation, and two knobs for adjusting parameters. There 
are 20 User Presets that can be edited, stored and recalled to match any configuration or system

Each channel has parallel XLR and ¼” TRS connectors for inputs. The outputs are professional NL4 and binding post connectors for mono and bi-amp 
speaker connectivity. You can keep your amplifier up-to-date with software updates using the USB connector.

Both amplifiers have complete loudspeaker processing:

•  Channel Gain & Polarity
•  4th Order Linkwitz Riley Highpass and Lowpass Filters
•  4-band Parametric EQ
•  50 mSec of Alignment Delay
•  QSC Power Limiting 

Package Contents

Rack-Mount the Amplifier

The GXD Series amplifiers are designed to be mounted in a standard rack-mount unit. The amplifiers are 2RU high, and 229 mm (9 in) deep.

1.  Secure the amplifier in the rack with four screws (not included). 

CAUTIONG!:

 

Be sure that nothing is blocking the front or rear ventilation openings, and that each side has a minimum of 

2 cm clearance.

1.  Quick-Start Guide TD-000449-00
2.  GXD Amplifier

3.  IEC AC Power Cord
4.  USB Cable

Summary of Contents for GXD 4

Page 1: ...GXD Amplifier User Manual GXD 4 GXD 8 TD 000450 01 A TD 000450 01...

Page 2: ...ith the manufacturer s instructions 10 Keep ventilation opening free of dust or other matter 11 Do not install near any heat sources such as radiators heat registers stoves or other apparatus includin...

Page 3: ...ese limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not inst...

Page 4: ...s for adjusting parameters There are 20 User Presets that can be edited stored and recalled to match any configuration or system Each channel has parallel XLR and TRS connectors for inputs The outputs...

Page 5: ...on selection 12 Channel B CLIP red Amplifier Rear Panel Figure 2 GXD 4 Figure 3 GXD 8 Figure 2 1 2 3 5 6 11 7 8 10 9 4 12 Figure 3 1 2 3 7 4 11 5 8 10 9 6 12 1 Channel 1 and Channel 2 Input XLRs femal...

Page 6: ...connector See Figure 6 Binding Posts Use banana plugs or wire directly AC Power WARNING The power cord shall be connected to a mains socket outlet with a protective earthing connection See Figure 7 C...

Page 7: ...cator illuminates red when the input is high enough to cause the channel to clip GXD Signal Flow Figure 9 1 2 Clip Digital Signal Processing DSP Sensitivity A D Converter Signal Presence Routing Matri...

Page 8: ...annels out Channel controls are not linked except sensitivity P8 through P10 Figure 15 1 or 2 channels in separate DSP 2 channels out Channel controls are not linked except sensitivity P11 through P18...

Page 9: ...channels equally at the same time Separate DSPs DSP A and DSP B are set independently for each channel Any changes you make are made in real time you hear the change as it is being made NOTE The term...

Page 10: ...LAY ENTER 4 B DELAY 0 00 to 56 30 FT or 17 16 M or 50 MS ENTER HOME Limiter See Figure 32 1 From HOME ENTER 2 B STEREO DSP ENTER 3 B LIMITER ENTER 4 B TYPE ENTER 5 B MILD MEDIUM or AGGRESSIVE ENTER 6...

Page 11: ...L ENTER HOME Reset See Figure 40 through Figure 41 1 From HOME ENTER 2 B UTILITIES ENTER 3 B RESET ENTER 4 B FACTORY RESET ENTER ENTER Figure 34 UTILITIES STATUS AMP TOTAL RUN TIME 12 42 5 HRS HARDWAR...

Page 12: ...Satellite 100 Hz Bypass P5 Stereo Subwoofer 20 Hz 80 Hz P5 P7 ST SUB 2 ST DSP B 1 A P6 Stereo Subwoofer 20 Hz 90 Hz P7 Stereo Subwoofer 20 Hz 100 Hz P8 DSP A DSP B Monitor 60 Hz 60 Hz Bypass Bypass P...

Page 13: ...dBu Input Connectors each channel 3 pin XLR F 1 4 TRS balanced Output Connectors each channel NL4 Channel 1 1 Channel 2 2 binding posts Amplifier and Load Protection Short circuit open circuit thermal...

Page 14: ...mer Service 714 957 7150 or toll free USA only 800 772 2834 Facsimile Numbers Sales Marketing FAX 714 754 6174 Customer Service FAX 714 754 6173 World Wide Web www qsc com E mail info qsc com service...

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