GXD Series
Professional Power Amplifiers
GXD 4 | GXD 8
GXD Series
Professional Power Amplifiers
Features
• High peak output power with up
to 1600 Watts from the GXD 4 and
a whopping 4500 Watts from the
GXD 8.
• The GXD amplifiers offer
speaker tunings to maximize the
performance of the QSC E Series
loudspeakers.
• Power levels matched to the
most popular loudspeakers and
optimized for maximum real-world
headroom into 4Ω and 8Ω speaker
systems.
• Class-D output stage with a
universal power supply for high
performance and efficiency.
• Extensive and powerful loudspeaker
processing built in. Includes High
& Low-Pass filters, 4-band PEQ,
Limiting, and Delay.
• Inputs: Parallel XLR and 1/4”
TRS connectors for compatibility
with any source while providing
convenient loop-thru capability.
• Precision rotary encoders for gain
and DSP parameter control.
• Outputs: Professional binding post
and NL4 connectors (compatible
with NL2) provide for mono and
bi-amp speaker connections.
• Digital Limiting automatically
protects the amplifier from
damage due to temperature rise or
overdrive.
• Adjustable speaker protection to
match your loudspeaker’s power
and impedance.
• Front panel LEDs indicate signal
presence, input overload, and
amplifier clipping.
As part of the E Series Entertainment
System, the GXD amplifiers are ideal for
entertainment and production applications.
With integral signal processing and
outstanding performance, the GXD
amplifiers express all the hallmarks of the
QSC brand - professional audio quality
and long-term reliability. Add contemporary
styling, multiple routing options, light weight,
digital signal processing and advanced
protection circuitry, and the GXD Series
clearly represents real value – something
everyone can use.
The GXD series is optimized for use with
8 and 4 ohm loudspeaker loads. GXD
amplifiers deliver just the right amount of
power to the most popular speakers used
by entertainers and production professionals.
The Right Power
There’s a GXD amplifier within 1dB of the
ideal power for your speaker system.
Best practice is to use an amplifier capable
of delivering approximately twice the
loudspeaker’s rated power capacity. Too
little amplifier and the speakers won’t
deliver everything they’re capable of and
the risk of destructive amplifier clipping is
increased. Too much power probably means
unnecessary amplifier expense.
To determine the power points for the GXD
series, QSC examined the loudspeakers
most widely used for sound reinforcement
by musicians, DJs and production
professionals. Overall, these speakers are
equipped with woofers that fall into a couple
of categories of continuous power capacity
- low-power drivers that can handle 150 -
250 watts, and mid to high-power drivers
rated around 250-400 watts. Single woofer
loudspeaker systems using these drivers
will typically have an impedance of 8Ω. Dual
woofer loudspeakers will, of course, have
power ratings that are two times that of the
single woofer model and an impedance that
is half that of single-woofer models.
Digital Signal Processing
The GXD amplifiers are unlike other amps
in this category that provide little more than
a front panel screen to control the same
functions that have been under rear-panel,
DIP switch control for decades. The GXD
amps bring full-function loudspeaker
processing capability to a new price point
with all the processing necessary to get the
most from a loudspeaker system. The DSP
section includes High and Low-Pass filters
(24dB LR), 4-band parametric equalizer,
signal alignment delay, and RMS/Peak
speaker protection limiting. Twenty presets
for selected typical systems are provided
as generic “starting points” are included. To
further prove the point, the GXD amplifiers
come pre-loaded with QSC E Series
loudspeaker tunings, enabling a simple
connect and play system that maximizes
the performance of the system.
Digital Limiting
The most common cause of loudspeaker
failure is amplifier clipping. The digital limiter
used in the GXD amplifiers is set to prevent
the amplifier from being driven into clipping
while delivering the maximum usable
output. In addition to amplifier limiting it
also provides smart speaker protection by
simply setting the loudspeaker’s continuous
power and impedance (4Ω and 8Ω), and
selecting whether Mild, Medium or Agressive
protection is desired.
Model 8Ω Power /Channel 4Ω Power /Channel Max Total Peak Power
GXD 4 400 Watts 600 Watts 1600 Watts
GXD 8 800 Watts 1200 Watts 4500 Watts
GXD Details
Specifications subject to change without notice.
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
600 Watts
800 Watts
400 Watts
600 Watts
1500 Watts
2250 Watts
800 Watts
1200 Watts
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
3.4 Amps
2.9 Amps
1.6 Amps
6.2 Amps
5.6 Amps
3.2 Amps
Frequency Response (20 Hz – 20 kHz) +0.7 dB, -0.8 dB
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
Load protected against DC faults
Front Panel Controls and Indicators 2 x Rotary Encoders
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
DSP Functions High Pass Filter, 4th order LR, adjustable Frequency 20 Hz to 4 kHz
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, Agressiveness, and Impedance selection
Delay 50 msec max.
Dimensions (HWD) 3.5" (2 RU) x 19" x 10.2" (89 mm x 483 mm x 259 mm)
Weight - Net 11.3 lb (5.1 kg) 13.2 lb (6.0 kg)
Weight - Shipping 15.4 lb (7.0 kg) 17.3 lb (7.8 kg)
Agency Approvals UL, CE, RoHS/WEEE compliant
Carton and Contents Power cable, and quick start guide
1675 MacArthur Boulevard • Costa Mesa, CA 92626 • Ph: 800/854-4079 or 714/957-7100 • Fax: 714/754-6174
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GXD Series Spec Sheet 01/22/2016