QSC GXD4 Quick Start Guide

GXD Amplifier

Quick Start Guide

EXPLANATION OF TERMS AND 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 fl ash 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 suffi cient 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.

NOTE:

custom confi gurations refer to the GXD User Guide.

This Quick Start Guide is based on the basic confi guration as the amplifi er comes from the factory. For detailed instructions for

Rack-Mount the Amplifi er

1. Secure the amplifi er in the rack with eight screws (not supplied), four in front, four in back.

— Figure 1 —

TD-000449-00-A

*TD-000449-00*

Connections

L

Inputs (Channels 1 & 2)

Input Impedance: 40 kΩ Balanced, 20 kΩ Unbalanced

(Figure 2

) See Table 1 for wiring

POS NEG GROUND

XLR 2 3 1

1/4 TIP RING SLEEVE

— Table 1 —

OUTPUTS TO SPEAKERS

K

C

K

C

O

L

CH A

1+ 1-

CH B

2+ 2-

O

L

CH B

1+ 1-

— Figure 3 —

123

1. XLR female

— Figure 2 —

2. ¼" female TRS Phone Jack

3. USB Standard B connector - Used for updating the amplifi er fi rmware.

Outputs (Channels A & B)

4Ω or 8Ω impedance

1. NL4 – Do not combine the audio outputs in any way. Do not connect the audio outputs to ground.

(Figure 3)

AC Power

A. Connect the IEC power cord to the AC receptacle on the rear of the amplifi er. (Figure 4)

Controls

See

Figure 5.

1. Channel A clip indicator

2. Channel A signal presence indicator

3. Power Switch/LED on/off

4. Adjust Channel A gain

5. Home – go to Home screen / view Preset screen

6. Enter – select highlighted item and/or confi rm parameter change

7. Exit – return to previous screen and/or undo parameter changel

8. Adjust Channel B gain, select and adjust controls

9. Channel B signal presence indicator

10. Channel B clip indicator

1

2

PROCESSING

AMPLIFIER

CLIP

+

A

GAIN

P1: ST SAT FULL RANGE

SIG

STATUS: OK

34 5 6 7 8

— Figure 4 —

A

dB

-100 10.0

HOME ENTER EXIT

— Figure 5 —

B

CLIP

B

SIG

GAIN/DSP CONTRO

10

9

Front Panel

LEDs

Sensitivity

Switched

in DSP

Sensitivity

Front Panel

LEDs

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Clip
LED

A/D

Converter

A/D

Converter

Clip
LED

Signal

Presence

Front
Panel

LEDs

Signal

Presence

Routing

Matrix

Controlled

by Preset
Selection

Front
Panel

Knobs

GXD Amplier Signal Flow

Digital Signal Processing

High-pass

Filter

High-pass

Filter

Polarity

Crossover

Polarity

Low-pass

Filter

Low-pass

Filter

— Figure 6 —

2

4-band

PEQ

4-band

PEQ

Delay Limiter MeterGain

Shown on

LCD

Delay Limiter MeterGain

D/A

Converter

D/A

Converter

A

B

Setup and Operation

Menu Tree

Preset

Preset Recall

Preset Save

Preset Save As

Key

B

Turn Knob B (or A) Select / Press Adjust

Home Screen

See Figure 8

From any screen

1. Currently active Preset (location and name)

2. Limit and Clip indicators

3. Output channel letter A and B

4. Output meter A and B (visual)

5. Output Gain (digital) Range = -100 to +10 dB

6. Amplifi er Status

HOME

Stereo DSP

Sensitivity

Crossover

EQ

Delay

Limiter

— Figure 7 —

Utilities

Status

Contrast

Timeout

Lockout

Reset

1
2

3
4
5

6

+

P1: ST SAT FULL RANGE

LIMIT CLIP

A

dB

-100 10.0

STATUS: OK

— Figure 8 —

B

Confi gurations

There are four basic types of confi guration:

• 2-channels in, stereo DSP, 2-channels out (P1 through P7) Figure 31

• 2-channels in, separate DSP, 2-channels out (P8 through P10) Figure 32

• 1or 2-channel in, separate DSP, 2-channels out (P11 through P18) Figure 33

• 1 or 2-channel in, stereo DSP, 2-channels out (P19 and P20) Figure 34

1

ST

DSP

2

— Figure 9 —

A

B

1
2

— Figure 10 —

DSP
DSP

A

B

The confi gurations are selected using the Presets. Refer to the GXD User Manual for details on all 20 available Confi gurations.

TD-000449-00-A

3

1

DSP

2

DSP

— Figure 11 —

A

B

1

ST

DSP

2

— Figure 12 —

A

B

Presets

A preset confi gures the inputs and outputs, along with setting the DSP.
There are 20 Presets. See

From Home

Figure 9.

ENTER

P1: ST SAT FULL RANGE

PRESETS

1

2

STEREO DSP

UTILITIES

3

ENTER TO SELECT

4

1. Previous selection

2. Currently selected

3. Next selection

4. Instructions

Recall a Preset

Recall a preset to confi gure the amplifi er to meet the requirements of your loudspeakers and installation.
There are 20 Presets. See

1. From Home

2. B Preset,

3. B Preset Recall,

4. B the preset you want,

Figure 10.

ENTER

ENTER

ENTER

ENTER ENTER

Save Preset

Saves the active preset with any DSP changes. See

1. From Home

2. B Preset,

3. B Preset Save,

ENTER

ENTER

ENTER ENTER

Figure 11.

— Figure 13 —

PRESET > RECALL
p20: MONO SUBS 100 HZ

ST

DSP

A

B

1
2

ENTER TO SELECT

— Figure 14 —

P1: ST SAT FULL RANGE

PRESET RECALL

PRESET SAVE

PRESET SAVE AS

ENTER TO SELECT

— Figure 15 —

Save Preset As

Select the Location and/or change the Name to save changes you make to the DSP.
See Figure 12 and Figure 13.

1. From Home

2. B Preset,

3. B Preset Save As,

4. B Location

5. B the Location (p1 to p20),

6. B Name,

7. B letter, number, hyphen, or space

8. B Save,

ENTER

ENTER

.

ENTER

ENTER

ENTER

.

ENTER ENTER

.

ENTER

.

ENTER

repeat. When fi nished

.

Stereo DSP (Digital Signal Processing)

The DSP is set for both channels equally, at the same time.

Sensitivity

See Figure 15 through Figure 17.

1. From Home

2. B STEREO DSP,

B Sensitivity,

3.

4.

B 1.2 V (+4 dBu) or 3.9 V (+14 dBu),

ENTER

ENTER

ENTER

.

.

Any changes you make are made in real time – you hear the change as it is being made.

ENTER

.

EXIT

PRESET > SAVE AS
P20: MONO SUBS 100 HZ

LOCATION
ENTER TO SELECT

NAME SAVE

— Figure 16 —

PRESET > SAVE AS
P20: MONO SUBS 100 HZ

ENTER: PRESS TO ADVANCE

.

HOLD TO ACCEPT

— Figure 17 —

DSP > SENSITIVITY

SENSITIVITY: 3.9V (+14dBu)

SENSITIVITY: 3.9V (+14dBu)

— Figure 18 —

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4

Crossover and Polarity

See Figure 15 through Figure 17.

1. From Home

2. B STEREO DSP,

B Crossover,

3.

4.

B HPF,

5. B Frequency (Bypass, 20 Hz to 4 kHz),

6. B LPF,

7. B Frequency (Bypass, 59.8 Hz to 4 kHz),

8. B POL,

9. B positive (+) or negative (-),

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER

.

.

ENTER HOME

ENTER

ENTER

XOVER > HIGHPASS

0

-6

HPF
FREQUENCY: 60 Hz

— Figure 19 —

POL LPF

XOVER > LOWPASS

0

-6

HPF

FREQUENCY: 2000 Hz

POL LPF

— Figure 20 —

XOVER > POARITY

+

HPF

POLARITY: +

POL

— Figure 21 —

LPF

EQ

See Figure 18 through Figure 20.

1. From Home

2. B STEREO DSP

3. B EQ

4. B Band 1, 2, 3, or 4

5. B Gain,

6. B Gain (-12 dB to +12 dB),

7. B Frequency,

8. B Frequency (20 Hz to 20 kHz),

9. B BW (bandwidth),

10. B BW (0.1 Octave to 3.0 Octave),

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER

ENTER HOME

Delay

See Figure 21

1. From Home

2. B STEREO DSP, press

3. B Delay,

4. B Delay (0.00 to 56.30 ft, or 17.16 m, or 50 ms),

ENTER

from the Home screen.

ENTER

ENTER

.

.

BAND 1 > GAIN

12

0

-12

GAIN: 8.0 dB

— Figure 22 —

ENTER HOME

BAND 1 > FREQ

12

0

-12

FREQUENCY: 1200 Hz

— Figure 23 —

BAND 1 > BW

12

0

-12

BANDWIDTH: 0.4 OCT

— Figure 24 —

DSP > DELAY

DELAY: 7.27 Ft
DELAY: 2.22 M
DELAY: 8.48 ms

DELAY: 8.48 MS

— Figure 25 —

.

Limiter

See Figure 22

1. From Home

2. B STEREO DSP,

3. B Limiter,

4. B Type,

5. B Mild, Medium, or Aggressive

6. B Power,

7. B Power (see Table 2),

8. B Impedance (4 or 8 Ohms),

TD-000449-00-A

ENTER

ENTER

ENTER

ENTER

ENTER

.

.

.

.

ENTER

ENTER

.

.

ENTER HOME

DSP > LIMITER

TYPE:MEDIUM
POWER:400W
IMPEDANCE:8

TYPE
TYPE: MEDIUM

POWER IMP

— Figure 26 —

Model 4Ω 8Ω

GXD4

.

GXD8

5 W – 600 W 5 W – 400 W

5 W – 1200 W 5 W – 800 W

— Table 2 —

5

Utilities

Status

See Figure 23

1. From Home,

2. B Utilities,

3. B Status

ENTER

ENTER

ENTER

a. Amp Total Run Time - Hours (HH:MM:SS)

b. Hardware - the version of the hardware unit

c. Firmware - the version of the fi rmware installed on the amplifi er

4. When fi nished,

HOME

Contrast

See Figure 24

1. From Home,

2. B Utilities,

3. B Contrast

4. B Contrast (0 to 10)

ENTER

ENTER

ENTER

.

ENTER HOME

Timeout

See Figure 25

1. From Home,

2. B Utilities,

3. B Timeout

4. B Timeout (NEVER, 30 Seconds, 1 Minute, or 5 Minute)

ENTER

ENTER

ENTER

.

ENTER HOME

UTILITIES > STATUS

AMP TOTAL RUN TIME:
12:42:5 HRS

HARDWARE: V3
FIRMWARE: V1.0.34

— Figure 27 —

UTILITIES > CONTRAST

CONTRAST TEST

CONTRAST TEST

CONTRAST: 10

— Figure 28 —

UTILITIES > CONTRAST

TIMEOUT: 1 MINUTE
TIMEOUT CAN EXTEND THE
LIFE OF THE DISPLAY

TIMEOUT: 1 MINUTE

— Figure 29 —

Lockout

See Figure 26 through Figure 28

1. From Home,

2. B Utilities,

3. B Lockout

ENTER

ENTER

ENTER

.

.

4. B Unlock, Lock Processing, or Lock All

5. B Unlock, Lock Processing, or Lock All

Reset

1. From Home,

2. B Utilities,

3. B Reset

4. B Factory Reset

TD-000449-00-A

ENTER

ENTER

ENTER

.

.

ENTER

ENTER

ENTER

.

ENTER HOME

.

UTILITIES > LOCKOUT

AMP: LOCK ALL

ALL FUNCTIONS WILL BE
AVAILABLE FOR EDITING

UNLOCK

— Figure 30 —

.

UTILITIES > RESET

ALL PRESETS AND
SETTINGS WILL BE
RESTORED TO DEFAULT

FACTORY RESET

ENTER TO RESET

— Figure 33 —

6

UTILITIES > LOCKOUT

AMP: UNLOCKED

ALL DSP FUNCTIONS WILL
NOT ALLOW EDITING

LOCL DSP

— Figure 31 —

UTILITIES > LOCKOUT

AMP: UNLOCKED

ALL FUNCTIONS INCLUDING
GAIN WILL BE UNEDITABLE

LOCK ALL

— Figure 32 —

UTILITIES > RESET

ALL PRESETS AND
SETTINGS WILL BE
RESTORED TO DEFAULT

FACTORY RESET

ENTER TO CONFIRM

— Figure 34 —

Mailing Address:

QSC Audio Products, LLC

1675 MacArthur Boulevard

Costa Mesa, CA 92626-1468 USA

Telephone Numbers:

Main Number: [phone]

Sales & Marketing: [phone] or toll free (USA only) [phone]

Customer Service: [phone] or toll free (USA only) [phone]

Facsimile Numbers:

Sales & Marketing FAX: [phone]

Customer Service FAX: [phone]

World Wide Web:

www.qsc.com

E-mail:

[e-mail]

[e-mail]

[e-mail]

If you would like a full copy of the GXD User manual, visit the QSC Audio Products website at www.qsc.com, or contact
Customer Service [phone] or toll free (USA only) [phone] to receive a copy by mail.

Si desea obtener una copia completa del manual del usuario de la GXD, visite el sitio web de QSC Audio Products en www.

qsc.com, o póngase en contacto con el Servicio al Cliente al [phone] o sin costo (sólo en EE.UU.) al [phone]

para recibir una copia por correo.

Pour obtenir un exemplaire complet du manuel d’utilisation de la GXD, allez sur le site Web QSC Audio Products à www.

qsc.com ou contactez le service clientèle au [phone] ou au [phone] (numéro vert - USA seulement) pour

recevoir un exemplaire par courrier.

Ein vollständiges Exemplar des Benutzerhandbuchs für die GXD fi nden Sie auf der QSC Audio Products-Website unter www.

qsc.com. Sie können sich unter [phone] oder unter der (nur in den USA) gebührenfreien Nummer +1 (800) 772-

2834 auch an den Kundendienst wenden, um sich ein Exemplar zuschicken zu lassen.

如果您需要 GXD 产品用户手册的完整副本，请访问 QSC 音频产品网站 www.qsc.com，或致电客户
服务部门 [phone]，或拨打免费电话（仅限美国）[phone] 通过邮件获取副本。

© 2014 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark offi ce and other

TD-000449-00-A

countries. All other trademarks are the property of their respective owners. Patents may apply or be pending.

http://patents.qsc.com.

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