QSC GXD4 User manual

GXD Amplifier

User Manual

GXD 4

GXD 8

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*TD-000450-00*

EXPLANATION OF SYMBOLS

The term “WARNING!” indicates instructions regarding personal safety. If the instructions are not followed the result may be bodily injury or death.

The term “CAUTION!” indicates instructions regarding possible damage to physical equipment. If these instructions are not followed, it may result in damage to the equipment that may not be covered under the warranty.

The term “IMPORTANT!” indicates instructions or information that are vital to the successful completion of the procedure.

The term "NOTE" is used to indicate additional useful information.

The intent of the lightning ﬂash with arrowhead symbol in a triangle is to alert the user to the presence of un-insulated "dangerous" voltage within the product's enclosure that may be of sufﬁcient magnitude to constitute a risk of electric shock to humans.

The intent of the exclamation point within an equilateral triangle is to alert the user to the presence of important safety, and operating and maintenance instructions in this manual.

IMPORTANT SAFETY INSTRUCTIONS

WARNING!:

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1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water.

6. Do not submerge the apparatus in water or liquids.

7. Do not use any aerosol spray, cleaner, disinfectant or fumigant on, near or into the apparatus.

8. Clean only with a dry cloth.

9. Do not block any ventilation opening. Install in accordance with 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 (including ampliﬁers) that produce heat.

12. To reduce the risk of electrical shock, the power cord shall be connected to a mains socket outlet with a protective earthing connection.

13. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not ﬁt into your outlet, consult an electrician for replacement of the obsolete outlet.

14. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.

15. Do not unplug the unit by pulling on the cord, use the plug.

16. Only use attachments/accessories speciﬁed by the manufacturer.

17. Unplug this apparatus during lightning storms or when unused for long periods of time.

18. Refer all servicing to qualiﬁed service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

19. The appliance coupler, or the AC Mains plug, is the AC mains disconnect device and shall remain readily operable after installation.

20. Adhere to all applicable, local codes.

21. Consult a licensed, professional engineer when any doubt or questions arise regarding a physical equipment installation.

TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.

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Maintenance and Repair

WARNING!:

maintenance and repair methods. To avoid a danger of subsequent damage to the apparatus, injuries to persons and/or the creation of additional safety hazards, all maintenance or repair work on the apparatus should be performed only by a QSC authorized service station or an authorized QSC International Distributor. QSC is not responsible for any injury, harm or related damages arising from any failure of the customer, owner or user of the apparatus to facilitate those repairs.

Advanced technology, e.g., the use of modern materials and powerful electronics, requires specially adapted

FCC Statement

NOTE:

FCC Rules.

These 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 installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

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• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the

Warranty

For a copy of the QSC Limited Warranty, visit the QSC Audio Products website at www.qsc.com

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Introduction

The GXD Class-D ampliﬁers have been engineered for high performance output and optimized for maximum real-world headroom into 4Ω and 8Ω loudspeaker systems. The power levels of the GXD ampliﬁers are matched to the most popular loudspeakers:

• GXD 4, per channel – 400 W into 8Ω, and 600 W into 4Ω (1600 W peak)

• GXD 8, per channel – 800 W into 8Ω, and 1200 W into 4Ω (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

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• 4-band Parametric EQ

• 50 mSec of Alignment Delay

• QSC Power Limiting

Package Contents

1. Quick-Start Guide TD-000449-00

2. GXD Ampliﬁer

3. IEC AC Power Cord

4. USB Cable

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).

CAUTION!:

2 cm clearance.

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

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Features

1 2 3 4 5 10 11 126 7 8 9

1 2 3 5 6 117 8 1094 12

1 2 3 74 115 8 1096 12

Ampliﬁer Front Panel

— Figure 1 —

1. Air Vents

2. Power Button

3. Channel A Signal Present (green)

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4. Channel A GAIN

5. Channel A CLIP (red)

6. HOME Button

7. ENTER Button

8. EXIT Button

9. LCD Screen

10. Channel B Signal Present (green)

11. Channel B GAIN and function selection

12. Channel B CLIP (red)

Ampliﬁer Rear Panel (Figure 2 GXD 4, Figure 3 GXD 8)

— Figure 2 —

— Figure 3 —

1. Channel 1 and Channel 2 Input XLRs (female)

2. Channel 1 and Channel 2 Input TRS female

3. USB Connector

4. Channel A Output Binding Posts

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5. Channel A Output NL4 Connector

6. Channel B Output Binding Posts

7. Channel B Output NL4 Connector

8. Air Vents

9. Circuit Breaker (GXD

10. Locking IEC Power Connection

11. Rear Rack-mount Bracket

12. Front Rack-mount Brackets

4–11 A, GXD 8–20 A)

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