Qsc GX7 Owner's Manual

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SPEAKERS

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HEADROOM

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CONNECTORS

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COMBO

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FITS

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AMPLIFIER

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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

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. 

3UBWOOFER3ATELLITE

Model  

GX3 For 

8

Ω speakers: 250 W – 350 W (program)

a

GX5 For 

8

Ω speakers: 400 W – 600 W (program)

b

GX7 For 

8

Ω speakers: 650 W – 800 W (program)

c

0ROFESSIONAL

a)  For 4Ω speakers: 350 W – 500 W (program) 
b)  For 4Ω speakers: 550 W – 900 W (program) 
c) For 4Ω speakers: 900 W – 1250 W (program)