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PLX Series Professional Audio Amplifiers
User Manual
®
4-ohm minimum impedance models with Speakon output terminals:
PLX 1104
PLX 1804
2-ohm minimum impedance models with Speakon and binding post terminals:
PLX 1802
PLX 2502
PLX 3102
PLX 3602
*TD-000214-00*
TD-000214-00 Rev.B
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Important Safety Precautions & Explanation of Symbols 1- Read these instructions. 2- 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. 8- Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that
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Introduction Thank you for purchasing this QSC power amplifier. Please read the following directions to obtain the best results. This manual covers all models of the PLX series. Illustrations show the PLX 1804 to be representative of the PLX 1104 and 1804 models, while the PLX 3602 illus- tration is representative of the PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models. The PLX 1104 and PLX 1804 models feature: 4-ohm minimum impedance Speakon loudspeaker connections QSC PowerLight high-per
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Rear Panel 1- Input Configuration switch 7- Cooling air inlet vents 2- 1/4-inch TRS input connectors 8- Clip Limiter switch 3- XLR female input connectors 9- Serial number plate 4- Low Frequency Filter switches 10- IEC-type AC mains inlet 5- Speakon output connectors 11- Circuit breaker, resettable 6- Binding post output connectors Rack Mounting The front panel casting includes features for Use four screws and washers to mount the amplifier to the finger-lifting and gripping at each end. equip
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Cooling Air flow in QSC amplifiers: Cool air is drawn into the rear of the amplifier by the cooling fan. Warm air exits Air flows from the rack, into the back of the amplifier, and out the the front of the amplifier. front. This keeps the rack cool. The fan automatically runs faster when the amp is working hard. Do not block the front or rear air vents! AC Mains Connection Connect AC power to the IEC socket on the back of the amplifier. NOTE: Turn off the AC power switch before connecting A
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Input Configuration Switch (PLX 1802/2502/3102/3602 models only) Input Configuration selector switch Select the input configuration by sliding the switch to the position which corresponds with the desired input configuration. Bridge- upper position Stereo- middle position Parallel- lower position Stereo Mode: Each channel remains independent, and each may be used for a different signal. Parallel Mode: This setting connects both inputs together. One input signal feeds both chan- Clip Limiter
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Inputs Each channel has a balanced XLR (female) and 1/4-inch TRS input. The XLR and TRS Input connectors and pinout connectors for each channel are wired in parallel and can be used for “daisy chain- chart (PLX1802 shown) ing” an input signal to additional amplifiers. The input impedance is 20k ohm balanced or 10k ohm unbalanced. Both XLR and TRS inputs are connected with standard cables and can be changed quickly. Pinouts are marked on the rear panel. Do not attempt to connect more than one
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PLX 1104 and PLX 1804 Output Connectors: Do Outputs not use less than 4 ohm impedance loads The PLX 1104 and PLX 1804 models are equipped with Speakon output with PLX 1104 and PLX 1804 models. connectors for each channel. PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models are equipped with Speakon and binding post output connectors. Wiring connections are shown on the back of the chassis. Carefully note the markings and maintain consistent loudspeaker polarity for optimum system performance
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LED Indicators The LED indicators can be used to monitor system operation and identify common problems. LED indicators on PLX 1104 and PLX POWER (PWR): BLUE 1804 models Normal indication: AC switch ON: LED will illuminate. If no indication: Check AC power cord and AC outlet. Confirm that AC switch is in ON position. CLIP: RED Normal indication: Illuminates whenever the amplifier is driven beyond full power. The resulting distortion corre- sponds to the brightness of the LED. Distortio
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Gain Controls Gain controls and LED cluster on PLX 1104 and PLX 1804 models Turn the GAIN controls clockwise to increase gain and counter clockwise to decrease gain. The GAIN controls are marked in dB of attenuation. There are 21 detents for repeatable adjustments. The upper 14 steps are about 1 dB each, and settings should normally be made within this range. The range below - 14 dB should not be used for normal program levels, as the input headroom could be exceeded, but can be used for
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Protection Systems Both amplifier platforms are fully protected against adverse conditions, but their behavior and user adjustments are different. PLX 1802/2502/3102/3602 models: Clip Limiting may be switched on the rear panel to prevent severe overdrive. This protects speakers and somewhat reduces the load on the amplifier. Internal current limits protect the output transistors against overloading. Peak limiting may occur at full output if using more than four 8-ohm speakers per channel,
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Specifications PLX 1104, PLX 1804 PLX 1104 PLX 1804 (1) OUTPUT POWER (Watts) 20 - 20k Hz, 0.05% THD, 8 ohms/Ch. 310 550 1k Hz, 0.1% THD (EIA), 8 ohms/Ch. 325 600 20 - 20k Hz, 0.05% THD, 4 ohms/Ch. 500 800 1k Hz, 0.1% THD (EIA), 4 ohms/Ch. 550 900 DISTORTION, SMPTE-IM 0.02% 0.02% FREQUENCY RESPONSE 20 - 20k Hz, ±0.5 dB, all models SIGNAL to NOISE, unweighted, 20 - 20k Hz -108 dB -106 dB VOLTAGE GAIN 32.5 dB 34.9 dB INPUT SENSITIVITY, Vrms for rated power into 8 ohms 1.18 (+3.7 dBu) 1.20 (+3.8 d
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Specifications PLX 1802, PLX 2502, PLX 3102, PLX 3602 PLX 1802 PLX 2502 PLX 3102 PLX 3602 (1) OUTPUT POWER (Watts) 20 - 20k Hz, 0.05% THD, 8 ohms/Ch. 320 425 550 725 1k Hz, 0.1% THD (EIA), 8 ohms/Ch. 330 450 600 775 20 - 20k Hz, 0.05% THD, 4 ohms/Ch. 525 675 900 1100 1k Hz, 0.1% THD (EIA), 4 ohms/Ch. 575 750 1000 1250 1k Hz, 0.1% THD (EIA), 2 ohms/Ch. 900 1250 1550 1800 Bridge Mono, 20 - 20k Hz, 0.1% THD, 8 ohms 1100 1400 1900 2500 Bridge Mono, 1k Hz, 0.1% THD, 8 ohms 1200 1500 2100 2600 Bridge
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Appendix A: Speakon Wiring Reference Amplifier connection To loudspeaker Two-wire, single-channel connection Four-wire, two-channel connection NOTE! Ensure proper polarity when connecting bridge mode output! Bridge mode connection 14
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How to Contact QSC Audio Products Cómo comunicarse con QSC Audio Products Comment prendre contact avec QSC Audio Products Kontaktinformationen für QSC Audio Products 联系 QSC Audio Products Mailing address: QSC Audio Products, Inc. 1675 MacArthur Boulevard Costa Mesa, CA 92626-1468 USA Telephone Numbers: Main Number (714) 754-6175 Sales & Marketing (714) 957-7100 or toll free (USA only) (800) 854-4079 Customer Service (714) 957-7150 or toll free (USA only) (800) 772-2834 Facsimile Numbers: Sales &
