Page 1
GXD Amplifier
User Manual
GXD 4
GXD 8
TD-000450-00-A
*TD-000450-00*
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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!:
EN EN
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.
TD-000450-00-A
2
Page 3
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.
EN EN
• 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
TD-000450-00-A
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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
EN EN
• 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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4
Page 5
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)
EN EN
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
TD-000450-00-A
5. Channel A Output NL4 Connector
6. Channel B Output Binding Posts
7. Channel B Output NL4 Connector
8. Air Vents
5
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)
Page 6
Connections
Inputs (Channels 1 & 2)
See Figure 4
Input Impedance: 20k ohms Balanced, 10k ohms Unbalanced See Table 1 for wiring.
1. XLR female
2. ¼" female TRS Phone Jack
3. USB Standard B connector - Used for updating the amplifier firmware, refer to the GXD User Manual
for details.
1 2 3
— Figure 4 —
Outputs (Channels A & B)
Input Wiring
See Figure 5
4Ω or 8Ω impedance
CAUTION!:
Do not combine the audio outputs in any way. Do not connect the audio
outputs to ground.
EN EN
Wiring Be sure to observe polarity.
• NL4 connector – See
• Binding Posts - Use banana plugs or wire directly.
Figure 6
2-
1+
2+
1-
Male NL4 Wiring
— Figure 6 —
Connector POS NEG GROUND
XLR 2 3 1
1/4" TIP RING SLEEVE
— Table 1 —
Power Output
Amplifier 8 Ω 4 Ω Total
GXD 4 400 W 600 W 1200 W
GXD 8 800 W 1200 W 2400 W
— Table 2 —
4 Outputs
GXD
— Figure 5 —
AC Power
WARNING!:
See Figure 7
Connect the IEC power cord to the AC receptacle on the rear of the amplifier.
Push to reset Breaker when necessary.
TD-000450-00-A
The power cord shall be connected to a mains socket outlet with a protective earthing connection.
Amplifier Voltage Current Frequency
GXD 4 100–240 VAC ~3.3 A–1.6 A 50/60 Hz
GXD 8 100–240 VAC ~6.3 A–3.1 A 50/60 Hz
Power Consumption
— Table 3 —
6
— Figure 7 —
Page 7
Controls
PRESET
PRESET RECALL
PRESET SAVE
PRESET SAVE AS
STEREO DSP*
SENSITIVITY
CROSSOVER
EQ
DELAY
LIMITER
UTILITIES
STATU S
CONTRAST
TIMEOUT
LOCKOUT
RESET
DSP A / DSP B*
SENSITIVITY
CROSSOVER
EQ
DELAY
LIMITER
8
PROCESSING
GAIN/DSP CONTROL
User Interface
5
See
Figure 8
1. Channel A CLIP indicator – illuminates red when the input is high enough to cause the channel to clip.
2. Channel A SIG (signal) present indicator – illuminates green when there is a signal applied to the input.
3. Power Switch/LED on/off – Illuminates blue when on.
4. Adjust Channel A GAIN
5. User Interface
a.
HOME
– go to HOME screen / view current PRESET
b.
ENTER
– select highlighted item and/or confirm
parameter change
c.
EXIT
– return to previous screen and/or undo parameter change
6. Adjust Channel B GAIN, selects and adjusts controls
7. Channel B SIG (signal) presence indicator – illuminates green when
there is a signal applied to the input.
8. Channel B CLIP indicator – illuminates red when the input is high
enough to cause the channel to clip.
EN EN
GXD Signal Flow
Clip
Digital Signal Processing (DSP)
1
A/D
Converter
Signal
Presence
Gain
High-pass
Filter
Polarity
1
2
CLIP
+
A
P1: ST SAT FULL RANGE
SIG
A
dB
B
-100 10.0
AMPLIFIER
Low-pass
GAIN
3 4 a b c 6
Filter
4-band
STATUS: OK
HOME ENTER EXIT
Delay Limiter Meter
PEQ
— Figure 8 —
D/A
Converter
CLIP
SIG
A
B
7
2
Sensitivity
A/D
Converter
Clip
Presence
Signal
Routing
Matrix
Setup and Operation
Menu Tree
LCD LCD
Gain
High-pass
Filter
Crossover
Polarity
— Figure 9 —
Low-pass
Filter
4-band
PEQ
Delay Limiter Meter
D/A
Converter
B
TD-000450-00-A
* STEREO DSP and DSP A / DSP B
depend on the selected configuration.
— Figure 10 —
7
Page 8
Navigation Key
1
5
6
7
8
P1: ST SAT FULL RANGE
A
B
-100 10.0
STATUS: OK
dB
LIMIT CLIP
3
*
2
4
P1: ST SAT FULL RANGE
ENTER TO SELECT
1
2
STEREO DSP
PRESETS
UTILITIES
3
4
Turn Knob B (or A) Select / Press Adjust
B
Home Screen
See Figure 11
ENTER
HOME
— Figure 11 —
From any screen
1. Asterisk (*) indicating an unsaved change to the preset
2. Currently active preset location (P1) and name
3. Output channel letter A and B
4. Limiter level indicator (Channels A and B)
5. LIMIT and CLIP indicators
6. Output meter A and B (visual)
7. Output gain (digital) range = -100 to +10 dB (Channels A and B)
8. Amplifier STATUS
EN EN
Main Navigation Menu
See
Figure 12
From HOME
1. Previous selection – PRESETS
2. Currently selected – STEREO DSP (or DSP A and DSP B)
3. Next selection – UTILITIES
4. Instructions
Configurations
There are four basic types of configuration selected by presets:
• Figure 13 – 2 channels in, stereo DSP, 2 channels out – Channel controls are linked, audio signals are not combined. (P1 through P7)
• Figure 14 – 2 channels in, separate DSP, 2 channels 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)
• Figure 16 – 1 or 2 channels in, stereo DSP, 2 channels out – Channel controls are linked, audio signals are combined. (P19 and P20)
1
2
— Figure 13 —
For ST (stereo) DSP presets, the DSP functionality (Crossover, PEQ, Delay, Limiter) controls are linked. Sensitivity is always linked.
PRESET
A preset configures the inputs and outputs, along with setting the DSP. When you make changes to the DSP, you can save your setup in any of the 20
preset locations. Refer to "Preset Defaults" on page 12 for the preset factory defaults.
View Current Preset Configuration
From HOME
To return
TD-000450-00-A
ST
DSP
— Figure 12 —
A
B
1
2
— Figure 14 —
HOME
HOME
DSP
DSP
A
B
1
2
— Figure 15 —
DSP
DSP
A
B
1
2
ST
DSP
A
B
— Figure 16 —
+
P1: ST SAT FULLRANGE
ST
DSP
A
B
1
2
HOME TO RETURN
— Figure 17 —
8
Page 9
PRESET RECALL
P1: ST SAT FULL RANGE
ENTER TO SELECT
PRESET SAVE
PRESET RECALL
PRESET SAVE AS
Recall a preset to configure the amplifier 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 18
ENTER
ENTER
ENTER
ENTER ENTER
PRESET SAVE
PRESET > RECALL
P20: MONO SUBS 100 HZ
ST
DSP
A
B
1
2
ENTER TO SELECT
— Figure 18 —
Saves the active preset with any DSP changes. See
1. From HOME
2. B PRESET,
3. B PRESET SAVE,
ENTER
ENTER
ENTER ENTER
PRESET SAVE AS
EN EN
Select the LOCATION and/or change the NAME to save changes you make to the DSP.
Figure 19
— Figure 19 —
PRESET > SAVE AS
P20: MONO SUBS 100 HZ
See Figure 20 and Figure 21
1. From HOME
2. B PRESET,
3. B PRESET SAVE AS,
4. B LOCATION
5. B the LOCATION (P1 to P20),
6. B NAME,
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
7. B letter, number, hyphen, or space
8. B SAVE,
ENTER ENTER
ENTER
repeat. When finished
EXIT
LOCATION
ENTER TO SELECT
PRESET > SAVE AS
P20: MONO SUBS 100 HZ
ENTER: PRESS TO ADVANCE
HOLD TO ACCEPT
NAME SAVE
— Figure 20 —
— Figure 21 —
STEREO DSP or DSP A and DSP B
STEREO DSP is set for both 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.
SENSITIVITY
See Figure 22 through Figure 24
1. From HOME
2. B STEREO DSP,
3. B SENSITIVITY,
4. B 1.2V (+4 dBu) or 3.9V (+14 dBu), TOUCHMIX,
TD-000450-00-A
NOTE:
The term "STEREO DSP" is used in this document as a generic term to mean either STEREO DSP or DSP A/DSP B, unless
specifically noted.
ENTER
ENTER
ENTER
DSP A+B> SENSITIVITY
SENSITIVITY: 3.9V (+4dBu)
SENSITIVITY: 1.2V (+4dBu)
ENTER
— Figure 22 —
STEREO DSP> SENSITIVITY
SENSITIVITY: 3.9V (+14dBu)
SENSITIVITY: 3.9V (+14dBu)
— Figure 23 —
DSP A+B> SENSITIVITY
SENSITIVITY: TOUCHMIX
SENSITIVITY: TOUCHMIX
— Figure 24 —
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Page 10
CROSSOVER AND POLARITY
See Figure 25 through Figure 27.
1. From HOME
2. B STEREO DSP,
3. B CROSSOVER,
4. B HPF,
5. B FREQUENCY (BYPASS, 20 Hz to 4 kHz),
6. B LPF,
7. B FREQUENCY (BYPASS, 60 Hz to 4 kHz),
8. B POL,
9. B positive (+) or negative (-),
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER HOME
CROSSOVER > HIGHPASS
0
-6
HPF
FREQUENCY: 60 Hz
ENTER
ENTER
POL LPF
— Figure 25 —
CROSSOVER > LOWPASS
0
-6
HPF
FREQUENCY: 2000 Hz
POL LPF
— Figure 26 —
CROSSOVER > POLARITY
+
HPF
POLARITY: +
POL
— Figure 27 —
LPF
EQ
See Figure 28 through Figure 30.
1. From HOME
EN EN
2. B STEREO DSP
3. B EQ
4. B BAND1, BAND2, BAND3, or BAND4
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 BANDWIDTH (0.1 Oct to 3.0 Oct),
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER HOME
DELAY
See Figure 31
1. From HOME
2. B STEREO DSP,
3. B DELAY,
4. B DELAY (0.00 to 56.30 FT, or 17.16 M, or 50 MS),
ENTER
ENTER
ENTER
BAND 1 > GAIN
12
0
-12
GAIN: 8.0 dB
ENTER HOME
— Figure 28 —
BAND 1 > FREQUENCY
12
0
-12
FREQUENCY: 1200 Hz
— Figure 29 —
BAND 1 > BANDWIDTH
12
0
-12
BANDWIDTH: 0.4 Oct
— Figure 30 —
DSP > DELAY
DELAY: 7.27 FT
DELAY: 2.22 M
DELAY: 8.48 MS
DELAY: 8.48 MS
— Figure 31 —
Limiter
See Figure 32
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 4),
8. B IMPEDANCE (4Ω or 8Ω),
TD-000450-00-A
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER HOME
ENTER
LIMITER > TYPE
TYPE:AGGR
POWER:125 W
IMPEDANCE:4 Ω
TYPE: AGGRESSIVE
— Figure 32 —
10
LIMITER > POWER
TYPE:AGGR
POWER:125 W
IMPEDANCE:4 Ω
POWER: 125 W
— Figure 33 —
Model 4Ω 8Ω
GXD 4
GXD 8
5 W – 600 W 5 W – 400 W
5 W – 1200 W 5 W – 800 W
— Table 4 —
Page 11
Utilities
Status
See Figure 34
1. From HOME,
2. B UTILITIES,
3. B STAT U S
ENTER
ENTER
ENTER
UTILITIES > STATUS
AMP TOTAL RUN TIME:
12:42:5 HRS
HARDWARE: V3
FIRMWARE: V1.0.34
— Figure 34 —
a. AMP TOTAL RUN TIME - Hours (HH:MM:SS)
b. HARDWARE - the version of the hardware unit
c. FIRMWARE - the version of the firmware installed on the amplifier
4. When finished,
Contrast
See Figure 35
1. From HOME,
EN EN
2. B UTILITIES,
3. B CONTRAST
4. B CONTRAST (0 to 10)
Timeout
See Figure 36
1. From HOME,
2. B UTILITIES,
3. B TIMEOUT
4. B TIMEOUT (NEVER, 5 MINUTES, 1 MINUTE, or 30 SECONDS)
HOME
ENTER
ENTER
ENTER
ENTER
ENTER
ENTER
.
ENTER HOME
.
ENTER HOME
UTILITIES > CONTRAST
CONTRAST TEST
CONTRAST TEST
CONTRAST: 10
— Figure 35 —
UTILITIES > TIMEOUT
TIMEOUT: 1 MINUTE
TIMEOUT CAN EXTEND THE
LIFE OF THE DISPLAY
TIMEOUT: 1 MINUTE
— Figure 36 —
Lockout
See Figure 37 through Figure 39
1. From HOME,
2. B UTILITIES,
3. B LOCKOUT
ENTER
ENTER
ENTER
.
.
4. B UNLOCK, LOCK DSP, or LOCK ALL
5. B UNLOCK, LOCK DSP, or LOCK ALL
Reset
See Figure 40 through Figure 41
1. From HOME,
2. B UTILITIES,
3. B RESET
4. B FACTORY RESET
ENTER
ENTER
ENTER
.
.
ENTER
ENTER
ENTER
.
ENTER HOME
.
UTILITIES > LOCKOUT
LOCKOUT:UNLOCKED
ALL FUNCTIONS WILL BE
AVAILABLE FOR EDITING
LOCKOUT:UNLOCK
— Figure 37 —
.
UTILITIES > RESET
ALL PRESETS AND
SETTINGS WILL BE
RESTORED TO DEFAULT
FACTORY RESET
ENTER TO RESET
— Figure 40 —
UTILITIES > LOCKOUT
LOCKOUT:LOCK DSP
ALL DSP FUNCTIONS WILL
BE LOCKED
LOCKOUT:LOCK DSP
— Figure 38 —
UTILITIES > LOCKOUT
LOCKOUT:LOCK ALL
ALL FUNCTIONS INCLUDING
GAIN WILL BE LOCKED
LOCKOUT:LOCK ALL
— Figure 39 —
UTILITIES > RESET
ALL PRESETS AND
SETTINGS WILL BE
RESTORED TO DEFAULT
FACTORY RESET
ENTER TO CONFIRM
— Figure 41 —
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Page 12
Preset Defaults
P1–P4: ST SAT
P5–P7: ST SUB
: MONITORS
: MONO SATS
The following settings apply to all factory presets.
Sensitivity:
Crossover:
EQ Band 1:
EQ Band 2:
EQ Band 3:
EQ Band 4:
Delay:
Limiter:
1.2V (+4dBu)
POLARITY +
GAIN 0.0 dB, FREQUENCY 100 Hz, BANDWIDTH 1.0 OCT
GAIN 0.0 dB, FREQUENCY 500 Hz, BANDWIDTH 1.0 OCT
GAIN 0.0 dB, FREQUENCY 1000 Hz, BANDWIDTH 1.0 OCT
GAIN 0.0, dB FREQUENCY 5000 Hz, BANDWIDTH 1.0 OCT
0.00 MS, M, FT (milliseconds, meters, and feet)
TYPE MEDIUM, POWER 800 W (400 W), IMP 8Ω
Table 5 lists the unique factory default settings for each preset.
Preset DSP Type Loudspeaker Type High-Pass Filter Low-Pass Filter Configuration
P1 Stereo Full Range Satellite 20 Hz Bypass
EN EN
P2 Stereo Full Range Satellite 80 Hz Bypass
P3 Stereo Full Range Satellite 90 Hz Bypass
P4 Stereo Full Range Satellite 100 Hz Bypass
P5 Stereo Subwoofer 20 Hz 80 Hz
P6 Stereo Subwoofer 20 Hz 90 Hz
P7 Stereo Subwoofer 20 Hz 100 Hz
P8
P9
P10
P11
P12
P13
P14
P15
P16
P17
P18
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
DSP A
DSP B
Monitor
Monitor
Monitor
Subwoofer
Full Range Satellite
Subwoofer
Full Range Satellite
Subwoofer
Full Range Satellite
Biamp
Biamp
Biamp
Biamp
Biamp
60 Hz
60 Hz
80 Hz
80 Hz
100 Hz
100 Hz
20 Hz
80 Hz
20 Hz
90 Hz
20 Hz
100 Hz
20 Hz
1000 Hz
20 Hz
1100 Hz
20 Hz
1200
20 Hz
1300 Hz
20 Hz
1500 Hz
Bypass
Bypass
Bypass
Bypass
Bypass
Bypass
80 Hz
Bypass
90 Hz
Bypass
100 Hz
Bypass
1000 Hz
Bypass
1100 Hz
Bypass
1200 Hz
Bypass
1300 Hz
Bypass
1500 Hz
Bypass
1
2
1
2
P8–P10
1
2
P11–P13: SUB SAT
1
2
P14–P18: BIAMP
1
2
ST
DSP
ST
DSP
DSP
DSP
DSP
DSP
DSP
DSP
A
B
A
B
A
B
A
B
A
B
P19 Stereo Mono Full Range Satellites 50 Hz Bypass
P20 Stereo Mono Full Range Satellites 100 Hz Bypass
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— Table 5 —
12
P19–P20
1
ST
DSP
2
A
B
Page 13
Specifications
GXD 4 GXD 8
Stereo Mode - watts per channel
8Ω dynamic, both channels driven
4Ω dynamic, both channels driven
8Ω continuous, both channels driven
4Ω continuous, both channels driven
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
Voltage Gain (8Ω) 33.5 dB 36.5 dB
Output Circuitry Class D Class D
Power Requirements: 1/8 power at 4Ω
- 100 Vac
- 120 Vac
- 230 Vac
Frequency Response (20 Hz – 20 kHz) +0.7 dB, -0.8 dB
EN EN
Dynamic Headroom (4Ω) 1.25 dB 2.73 dB
Damping Factor 100
Input Impedance (Ω) 20k (balanced), 10k (unbalanced)
Maximum Input Level +23.5 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, RF protection
Front Panel Controls and Indicators 2 x Rotary Encoders
DSP Functions High Pass Filter, 4th order LR, adjustable Frequency 20 Hz to 4 kHz
Dimensions (HWD) 89 mm (2 RU) x 483 mm x 259 mm (3.5" x 19" x 10.2")
Weight - Net 5.1 kg (11.3 lb) 6.0 kg (13.2 lb)
Weight - Shipping 7.0 kg (15.4 lb) 7.8 kg (17.3 lb)
Agency Approvals UL, CE, RoHS/WEEE compliant
600 watts
800 watts
400 watts
600 watts
3.4 Amps
2.9 Amps
1.6 Amps
Load protected against DC faults
3 x Operational buttons (HOME, ENTER, EXIT)
2 x Green Signal LEDs, indicate signal presence
2 x Red A/D Clip LEDs, indicate input over-drive and/or amplifier current clipping
Blue Power LED ring, AC on
2.12" x 1.0", 256 x 128 pixel LCD
Low Pass Filter, 4th order LR, adjustable Frequency 60 Hz to 4 kHz
4-band PEQ, with variable Frequency, Gain, and Bandwidth
Peak Limiter, with Power, Aggressiveness, and Impedance selection
Delay 50 msec max.
1500 watts
2250 watts
800 watts
1200 watts
6.2 Amps
5.6 Amps
3.2 Amps
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Mailing Address:
QSC Audio Products, LLC
1675 MacArthur Boulevard
Costa Mesa, CA 92626-1468 USA
Telephone Numbers:
Main Number: (714) 754-6175
Sales & Marketing: (714) 957-7100 or toll free (USA only) (800) 854-4079
Customer 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
EN EN
World Wide Web:
www.qsc.com
E-mail:
info@qsc.com
service@qsc.com
tech_support@qsc.com
© 2015 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are trademarks of QSC Audio Products, LLC in the U.S. and other countries. All other trademarks are
TD-000450-00-A
the property of their respective owners.
http://patents.qsc.com.
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