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TM
GX POWER AMPLIFIER SERIES
User Manual
GX3 300 watts per channel at 8 ohms
GX5 500 watts per channel at 8 ohms
EN
TD-000271-01 REV. A
*TD-000271-01*
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IMPORTANT SAFETY PRECAUTIONS AND EXPLANATION OF SYMBOLS 1- Read these instructions. - Keep these instructions. 3- Heed all warnings. 4- Follow all instructions. 5- WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. Do not use this apparatus near water. 6- Clean only with a dry cloth. 7- Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions. 8- Do not install near any heat sources such as radiators, heat re
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3 GX POWER AMPLIFIER SERIES Professional Power Amplifiers WELCOME Thank you for purchasing a QSC Audio amplifier. The GX Series is the latest in a long line of hard-working, low cost amplifiers, designed to produce the best possible results for a wide range of users. In most cases, you can plug and play with no surprises, but for best results, we recommend you review the enclosed user guide. UNPACKING EN Confirm that the amplifier has no visible shipping damage. Confirm FEATURES that amplif
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4 FRONT PANEL FEATURES MODEL NUMBER The GX3 and GX5 power ON-OFF SWITCH ratings are shown in the Move the rocker switch up to turn on the amplifier. Specifications page. The blue PWR LED will turn on immediately. The red CLIP LEDs may trigger for 1-2 seconds until the amp has completed its turn-on cycle. If no lights come on, check the power cord and the AC reset on the rear panel. COOLING VENTS The internal fan draws air in from the left side, and exhausts on the right side. Keep vent
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5 GAIN CONTROLS, CH1, CH2 The markings show attenuation in dB. For normal use, keep the control in the upper half of its range RACK MOUNTING (less than 10 dB of attenuation). If set below half, Fits standard 19-inch rack, 2RU. the source may overload before the amplifier Accepts #10 or 6 mm screws, reaches full power. as determined by the rack rails. Add rear support to prevent damage in portable rigs. EN RED CLIP LEDS Red flashing indicates the amp is being overdriven. Heavy overdrive trigg
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6 REAR PANEL FEATURES CROSSOVER SWITCH EXHAUST VENT Keep vent clear. Install in open-back rack. CROSSOVER POSITION Splits a full-range signal to drive a subwoofer and top box. CH 1 receives the lows, from 20-100Hz, for the subwoofer. CH 2 receives 100Hz to 20kHz, to power a full range speaker. When using CROSSOVER mode, connect signal to CH 1 only. Use the two Gain controls to balance the LF and HF signals (see Front Panel). FULL RANGE POSITION For normal, 2-channel use with all inputs active.
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7 AC BREAKER RESET If the amplifier shuts off after a long burst of power, turn off the AC switch and check the circuit breaker. The button can be pressed back in after a 30 second cool-down period. If the breaker trips repeatedly, the amplifier may need servicing. SERIAL NUMBER AND RATINGS The rated AC voltage and output power is shown on the serial number plate. Record the serial number in a safe place. EN AC INLET SPEAKER CONNECTIONS BINDING POSTS Accepts banana plugs (not permitted in CE reg
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8 SYSTEM HOOKUP EXAMPLES INPUT CONNECTIONS SPEAKER CONNECTIONS 8 OR 4 OHM XLR MIXER SIGNAL LEVEL SOURCE SPEAKON SET TO FULL RANGE ¼ MIXER EN ¼ SIGNAL LEVEL SOURCE SET TO FULL RANGE WIRE PHONO MIXER SIGNAL LEVEL SOURCE BANANA JACKS SET TO FULL RANGE One 4-OHM speaker, or two 8-OHMspeakers, may be connected to each channel. CONNECTION MULTIPLE SPEAKERS If speakers have pass through jacks, do not put more than two in a chain. To connect two speakers to one amplifier channel, 8 OHM 8 OHM 8 OHM 8
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SYSTEM HOOKUP EXAMPLES SUBWOOFER AND TOP BOX 8 OR 4 OHM INPUT Move the CROSSOVER switch to TOP SET TO CROSSOVER the CROSSOVER position. Connect a single source, into the Ch 1 input. 8 OR 4 OHM Connect a subwoofer to the Ch 1 output and connect a SUB 2-way to box to the Ch 2 output. 8 OHM 8 OHM POWERING HOUSE AND MONITOR SPEAKERS MAIN MAIN EN Set the CROSSOVER switch to the FULL RANGE position. Use a mixer with Main and Monitor outputs. Connect cables into Ch 1 and 2 respectively. Conne
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10 TROUBLESHOOTING TROUBLESHOOTING NO POWER, NO LIGHTS, NO FAN NO SOUND, WITH BLUE LED ONLY, NO GREEN OR Confirm that the AC cord is fully seated and connected to a RED LED live outlet. Check the AC source by trying another device Confirm that the Gain controls are turned up. Confirm that such as a lamp. Check the BREAKER on the back of the the input cables are correctly installed at both ends. If using amplifier by pushing in the button. If the breaker trips off 1/4-inch speaker cables, do no
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11 SPECIFICA SPECIFICATIONS TIONS GX3 GX5 SPECIFICATION SUBJECT TO CHANGE WITHOUT NOTICE. OUTPUT POWER, 1 kHz, 0.1 % clipping 8Ω, both channels driven 300 W 500 W 8Ω, single channel driven 350 W 600 W 4Ω, both channels driven 425 W 700 W 4Ω, single channel driven 500 W 850 W 2Ω, both channels driven, 1% clipping 200 W 350 W SIGNAL TO NOISE (20 Hz – 20 kHz) 100 dB INPUT SENSITIVITy 1.2 Vrms EN VOLTAGE GAIN AT 8Ω 32.2 dB 34.4 dB OUTPUT CIRCUITRy Class B 2-tier Class H POWER REQUIREMENTS (1/8 po
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WARRANTY (USA only; other countries, see your dealer or distributor) Disclaimer QSC Audio Products, Inc. is not liable for any damage to amplifiers or any other equipment that is caused by negligence or improper installation and/or use of this loudspeaker product. QSC Audio Products 3 Year Limited Warranty QSC Audio Products, Inc. ( QSC ) guarantees its products to be free from defective material and / or workmanship for a period of three (3) years from date of sale, and will replace defective
