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, lightweight, 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. The 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 Aggressive protection is desired.In the Box
QSC GXD 8 Professional 4500W Power Amplifier with DSP
IEC Power Cord
Limited 3-Year WarrantyNot In The Box
XLR & Signal CablesStereo Mode - Watts per channel: 8Ω dynamic, both channels driven (1500 Watts), 4Ω dynamic, both channels driven (2250 Watts), 8Ω continuous, both channels driven (800 Watts), 4Ω continuous, both channels driven (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): 36.5 dB
Output Circuitry: Class D
Power Requirements (1/8 power at 4Ω): 100 Vac (6.2 Amps), 120 Vac (5.6 Amps), 230 Vac (3.2 Amps)
Frequency Response (20 Hz – 20 kHz): +0.7 dB, -0.8 dB
Dynamic Headroom (4Ω): 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, Aggressiveness, and Impedance selection, Delay 50 msec max
Dimensions (HxWxD): 3.5" (2 RU) x 19" x 10.2" (89 mm x 483 mm x 259 mm)
Weight - Net: 13.2 lb (6.0 kg)
Agency Approvals: UL, CE, RoHS/WEEE compliant
Carton and Contents: Power cable, and quick start guide
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