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INPUT CONNECTIONS
XL~
••••
MIXER
111111
SIGNAL LEVEL SOURCE
1~
••••
MIXER
SIGNAL LEVEL SOURCE
111m
INPUTS
~
.CHI
.CHZ
(I)
INPUTS O··
.CHI
ecHzo
SPEAKER CONNECTIONS
CROSSOVER
SET TO FULL RAN6E
WI~
~
••••
MIXER
SIGNAL LEVEL SOURCE
111111
CONNECTING MULTIPLE SPEAKERS
To connect two speakers to one amplifier channel,
connect one speaker with Speakon or 1/ 4-inch jack,
and connect the otherspeakerwith a banana plug
or wires tD the binding posts.
Itis also possible to use banana plug for one speaker,
and binding post wires for the other speaker.
~ ~"dOMa•
~ J$'·--
1/4-in.ch jac~, First speaker
and wues to the
binding posts.
OUTPUT~
~
CHI
.....
--
CROSSOVER
BANANA JACKS
SET TO FULL RAN6E
One 4-ohm speaker, or two 8-ohm speakers, may be connected to each channel.
If speakers have pass through jacks, do not put more than two in a chain.
8 OHM 8 OHM
BOHM
40HM 8 OHM
40HM
40HM 40HM
8 OR40HM

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SUBWOOFER AND TOP BOX.
Move the CROSSOVER switch to
the CROSSOVER position.
Connect a single source, into the
Ch 1input
INPUT ----.
SET TO CROSSOVER
Connect a subwoofer to the
Ch 1 output and connect a
2-waytop box to the Ch 2output
SUB GAIN TOP GAIN
.,:O'"'D .. ocu~o _0 ,.- -~
•••••
... .. .. ..
. . -.
Lll--==--w"• ·• a
POWERING HOUSE AND MONITOR SPEAKERS
Set the CROSSOVER swHch
to the RJLL RANGE position.
Use a mlxerwtth Main and
Monitor outputs. Connect cables
Into Ch 1 and 2 respectively. ~.=-:•=-:•=-:• ~h
INPUTS
Connect Ch 1 output to
two large speakers.
Connect Ch 2 output to
two floor wedges.
STEREO PLAYBACK
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RJLL RANGE position. Connect a
111111
Left /Right signal source to channel1
and channel2 respectively using
XLR, TRS or PHONO connectors.
Connect a speaker to each channel
uslngSPEAKON,1/4" PHONE,
BANANAJACKS orWIRE.
(j)
.CHI
• CHI
~
••••
111111
USING BOTH CHANNELS FOR THE SAME SIGNAL
Move the CROSSOVER swHch to the
RJLL RANGE position. Hook up a single source
using Ch 1 XLR Input. Install a RTS Jumper
going between CH 1 and CH 2. • • • • •
Connect a speaker to each channel. ~~~~ ~~
Each speaker has its own gain
adjustment on the front panel.
DO NOT connect both channels
Into the same speaker.
RTSjumper
between
CH land CH2.
DO NOT connect both
channels into the same speaker.
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~ .,.,..®(~
Clll+ -
DR
:······r-----.
.
.
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:!!'~CIII -
~~CIII+
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BDHM
L1
4DR
BDHM
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TOP
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L2
4DR
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70

Features
s0OWERLEVELSMATCHEDTOTHEMOSTPOPULAR
SPEAKERSUSEDBYENTERTAINERS
s/PTIMIZEDFORMAXIMUMREALWORLD
HEADROOMINTOΩANDΩSPEAKERSYSTEMS
s)NPUTS8,2423ANDPHONOINPUT
CONNECTORSFORCOMPATIBILITYWITHANYSOURCE
s/UTPUTS3PEAKON¸COMBOACCEPTS
43PLUGSOR3PEAKONPOLEANDPOLE
PLUGSCONNECTSPOLESONLY"INDINGPOSTS
SUPPORTALLOTHERSPEAKERWIRINGSYSTEMS
s-INIMUMDEPTHCHASSISMM
FITSINCOMPACTINEXPENSIVEEFFECTSRACKS
s,IGHTWEIGHTn'8AND'8LESSTHANLBS
KG'8ONLYLBSKG*
s$ETENTEDGAINCONTROLSFORPRECISESETTING
ANDMATCHINGOFSENSITIVITY
s'UARD2AIL»AUTOMATICALLYPROTECTSTHE
AMPLIFIERANDLOUDSPEAKERSFROMDAMAGE
DUETOTEMPERATURERISEOROVERDRIVEWITHOUT
SHUTTINGDOWNTHESHOW
s&RONTPANEL,%$SMONITOR0OWER3IGNAL
AND#LIPPING
s3UBWOOFER3ATELLITECROSSOVERBUILTIN
* 230V 16.5 lbs (7.5 kg)
GX Series amplifiers are ideal for professional entertainers who require maximum performance
and portability on a limited budget. The hallmarks of the QSC brand – professional audio quality,
meticulous engineering, precision manufacturing and long-term reliability - are all intrinsic to GX. Add
contemporary styling, multiple input/output options, light weight, and advanced protection circuitry,
and the GX Series clearly represents real value – something everyone can use.
GX amplifiers deliver just the right amount of power to the most popular speakers used by
entertainers. Typically, loudspeaker manufacturers recommend an amplifier with power output equal
to the speaker’s “Program (Music) Power” rating or two times (2 x) the “Continuous (RMS)
Power” rating.
The GX3 is ideal for speakers in the 300 watt (Program) range, while the GX5 provides full
performance for 500 watt (Program) speakers. The GX7 outputs 725 watts into an 8 ohm load.
Owners of popular 4 ohm loudspeakers (such as dual-woofer, two-way models) will find the 700
watt (4 ohm) power of the GX5 an ideal match while the GX7 1000 watts will very capably power
many of today’s popular subwoofers or two typical 8 ohm speakers per channel.
4ECHNICAL.OTES
The GX3 uses the latest evolution of the QSC Grounded Collector output system, for optimum
cooling of the critical power transistors. A true Class B biasing system combines maximum thermal
efficiency with excellent audio performance.
The GX5 uses a Class H system, based on key elements of the PL Series, (PLX, PL3, CX, DCA)
almost doubling power in the same size and weight. QSC design expertise allows the output
devices to shift from low-power to high-power rails in less than a millionth of a second, ensuring
that the output power is always right where it needs to be without excess loss.
Both amplifiers use premium toroidal power transformers for reliable "mid-weight" performance.
A variable-speed fan moves air crosswise through the amplifier, drawing cool air in over the power
transformer, through the fan, and then over the heat sink. This keeps the transformer cool and
allows a full size heat sink to fit in a down-sized chassis.
The GX7 adds the road-proven PowerLight supply to the Class H output section, for more overall
output power and additional weight savings. The result is one of the highest power-to-weight ratios
in the industry. A low-noise variable-speed fan with rear-to-front airflow keeps amplifiers and
racks cool.
As always, GX Series amplifiers are fully protected from the usual hazards of the trade, ensuring
stable performance and long life.
'UARD2AIL»
GuardRail protection delivers full peak power while preventing detrimental overloads. During excessive
clipping, or extreme overheating, GuardRail reduces gain just enough to preserve the integrity of the
music, protect the speakers and keep the audience excited, without unprofessional distortion levels
or shutdowns.
3UBWOOFER3ATELLITE#ROSSOVER
A subwoofer reduces strain on the full-range speaker, allowing it to play louder, or letting a smaller
speaker do the same job. The GX Series supports this mode with a Crossover switch that splits the
full-range input entering Ch 1, sending 20 Hz -100 Hz to the sub (Ch 1) and 100 Hz - 20 kHz to the
top box (Ch 2). The front panel gain controls balance the sub and top box, while GuardRail optimizes
peak power into the sub and top individually, for greater musical impact and dynamic range. GuardRail
optimizes peak power into the sub and top individually, for greater musical impact and dynamic range.
Choose the right GX amp for your speakers
Model
GX3 For 8Ωspeakers: 250 W – 350 W (program)a
GX5 For 8Ωspeakers: 400 W – 600 W (program)b
GX7 For 8Ωspeakers: 650 W – 800 W (program)c
GX Series
0ROFESSIONAL0OWER!MPLIFIERS
GX3 | GX5 | GX7
a) For 4Ωspeakers: 350 W – 500 W (program)
b) For 4Ωspeakers: 550 W – 900 W (program)
c) For 4Ωspeakers: 900 W – 1250 W (program)

GX Series Preliminary Specifications
qscaudio.com
All specifications are subject to change without notice.
-AC!RTHUR"OULEVARDs#OSTA-ESA#!s0HORs&AX
GX Spec Sheet 04/05/11
©2011 QSC Audio Products, LLC. All rights reserved. QSC and the QSC logo are registered trademarks of QSC Audio Products, LLC in the U.S. Patent and Trademark office and
other countries. GuardRail is a trademark of QSC Audio Products, LLC. Speakon is a trademark of Neutrik. All other trademarks are the property of their respective owners. US
patent pending. Other patents may apply.
GX3 GX5 GX7 GX7 (230V Only)
Stereo Mode - Watts per channel
8Ω/ both channels driven / 1 kHz*
8Ω/ single channel driven / 1 kHz*
4Ω/ both channels driven / 1 kHz*
4Ω/ single channel driven / 1 kHz*
300 W
350 W
425 W
500 W
500 W
600 W
700 W
850 W
725 W
800 W
1000 W
1200 W
Distortion (typical)
1 kHz: 1 dB below rated power 8Ω: less than 0.02% / 4Ω: less than 0.05%
Signal to Noise (20 Hz – 20 kHz) 100 dB
Input Sensitivity 1.2 Vrms
Voltage Gain (8Ω) 32.2 dB 34.4 dB 36.1 dB
Output Circuitry Class B 2-tier Class H 2-tier Class H
Power Requirements (1/8 power, pink noise at 4Ω, 120 V) 6.3 A 6 A 10.1 A
Frequency Response 20 Hz – 20 kHz, +0, 1 dB
Dynamic Headroom (4Ω) 2 dB
Damping Factor 100
Input Impedance (Ω) Greater than 20k (balanced)
Maximum Input Level +24 dB (16 Vrms)
Input Connectors (each channel) 3-pin XLR and 1/4" TRS, balanced, parallel
Phono, unbalanced
Output Connectors (each channel) Speakon®, 1/4", Binding Posts
Amplifier and Load Protection Short circuit, open circuit, thermal, RF protection
Load protected against DC faults
Front Panel Controls and Indicators Gain controls, 21 detents
Red Clip LEDs, proportional, 0.1% THD threshold
Green Signal LEDs, threshold -35 dB
Blue Power LED, AC on
Rear Panel Controls Full Range / Crossover switch
100 Hz, 3rd order LP (sub), 2nd order HP (top)
Dimensions (HWD) 3.5" (2 RU) x 19" x 10.1" (89 mm x 483 mm x 257 mm)
Weight - Net 27 lb (12.1 kg) 28 lb (12.6 kg) 15.5 lbs (7 kg) 16.5 lbs (7.5 kg)
Weight - Shipping 31 lb (14.1 kg) 32 lb (14.6 kg) 20.5 (9.3 kg) 21.5 (9.75 kg)
Agency Approvals UL, CE, RoHS/WEEE compliant
* At onset of clipping
Inputs
XLR, 1/4" TRS and phono input connectors
for compatibility with any source
Crossover
Subwoofer/Satellite crossover built-in Speakon®combo output connector
accepts 1/4" or Speakon 2 wire connectors
Binding post output for compatibility
with any loudspeaker wiring scheme
Outputs to Speakers
PLEASERECYCLE

GX Series
Hookup Drawings
If
you
would
like
a
full
copy
of
the
GX
Series
User
manual,
visit
the
QSC
Audio
Products
website
at
www
.
qscaudio.com,
or
contact
Customer
Service
+
1
714
957-7150
or
toll
free
(USA
only)
1-800-772-2834
to
receive
a
copy
by
mail.
Input
Connector
Types
(f)
0··
INPUT
CONNECTOR
PINS
(j)
CHI
•
'"
0
~'
·.·
41lW.AIICED
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XLR
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PHONO
POS
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2 3
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RING
TIP
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1
/
4-;""i'~"'"''"'
and
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the
binding
posts.
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plug
and
binding
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Output
Connector Types
-
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OUTPUT
CONNECTOR
PINS
POS
NEG
SPEAKON
1+
1-
1/4
PHONE
TIP
SLEEVE
-~C!>·
~
CH2+ -
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v
Multiple Speakers
to
One Channel
8
OHM
Speaker Options
8
OHM
8
OHM
8
OHM
8
OHM
4
OHM
8
OHM
4
OHM
4
OHM
4
OHM
4
OHM
4
OHM

Typical
Applications
For
additional
application
examples,
refer
to
the
GX
Series
User
Manual.
Input
CHl Only
Subwoofer
and
Top Box
Set
to
Crossover
CHI+
-
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,.,.
~
~
CH2+ -
Main
and
Monitor
Speakers
Main
Out
Inputs
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CH
l
CH
Z
I
~
FULL
RANGE
~
~C
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(!)
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2
~
Monitor
Out
Stereo Playback
Left
Inputs
••••
.
II.
OR
111111
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CHl
CHZ
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H
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ec
Hl
if\
100Hz
'ii
$ CH2
~(@)CH
2
+
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FULL
RANGE
Right
Set
to
Full Range Outputs
Using Both Channels
for
the
Same Signal
Inputs
•••••
IIIIi
I
~~
C
H
l
+-
~~
CH
2+
Outputs
Set
to
Full Range
CH
2 -Top
Top
1a
10
a
8or40HM
..
..
CH
1- Sub
Sub
8or40HM
..
Main
80HM
8or4
OHM
©
20
II
QSC,
and the
QSC
logo a
re
reg
istered trademar
ks
of
QSC
Audia
Produ
cts,
LL
Cin
th
e
U.S.
Pa
te
nt
a
nd
Tra
demark office andather
cou
ntri
es
.
Alla
th
er trademarks are
th
e property
of
the
ir
re
spective
owners.
Otherpate
nts
mayapply or
be
pending.

o=!5:i·i•
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-
Passionate
About
Sound
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(Part Name)
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QSC
AUDIO
PRODUCTS,
LLC
1675
MacArthur
Blvd.,
Costa
Mesa,
CA
92626
Phone
714.754.6175
Fax
714.754.6168
~-~~!l"ll~:E&n~
(Toxic or hazardous Substances and Elements )
fl
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SJ/T11363-2006.
PL
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CX
, PL3
*91J
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GX7
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(Chassis Assemblies)
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2006t&I!H(I'g~).J<Z"'Fo
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I
nd
icates that this toxic or hazardous substan
ce
contain
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in all
of
the homogeneous materials for this part is below the limit r
eq
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pa
rt is above the li
mi
t requirement in
SJ/T
11
363-2006.
TD-000254-
E.
doc
REV E

QSC Audio Products Limited Warranty
QSC Audio Products, LLC ("QSC") guarantees its products to be free from
defective material
and/or workmanship and will replace defective parts
and repair malfunctioning products under this warranty when the defect
occurs under normal installation and use-provided the unit
is returned to
our factory, one
of our authorized service stations or an authorized QSC
International Distributor via pre-paid transportation with a copy of proof of
purchase (i.e., sales receipt). This warranty provides that the examination of
the return product must indicate, in our judgment, a manufacturing defect.
This warranty does not extend to any product which
has been subjected
to misuse, neglect, accident, improper installation, or where the date code
has been removed or defaced. QSC shall not be liable for incidental and/
or consequential damages. This warranty gives you specific legal rights. This
limited warranty
is freely transferable during the term of the warranty period.
The warranty on
QSC products is NOT VALID if the products have been
purchased from
an unauthorized dealer/online e-tailer, or if the original
factory serial number
has been removed, defaced, or replaced in any way.
Damage to, or loss of any software or data residing on the product is not
covered. When providing repair or replacement service,
QSC will use rea-
sonable efforts to reinstall the product's original software configuration and
subsequent update releases, but will not provide any recovery or transfer
of software or data contained on the serviced unit not originally included
in the product.
Customers may have additional rights, which vary from state to state or from
The QSC limited warranty is valid for a period of three (3) years
from date of purchase in the United States and many (but not all)
other countries.
For QSC warranty information in countries otherthan the United States, con-
tact your authorized
QSC international distributor. A list of QSC International
distributors
is available at www.qscaudio.com.
To register your QSC product online, go to www.qscaudio.com and select
"Product Registration". Other questions regarding this warranty
can be an-
swered by calling, e-mailing or contacting your authorized
QSC distributor.
Phone: [phone] within US and Canada
[phone] international
Email: [email protected]
www.qscaudio.com
Model#
Serial#
Purchase Date
country to country. In the event that a provision of this limited warranty is Store Where Purchased
void, prohibited or superseded by local laws, the remaining provisions shall -------------------------
remain in effect. please recycle 0
Retain this form for your records