User manual QSC AUDIO PLX2

[. . . ] 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-000214-001Rev. C Important Safety Precautions & Explanation of Symbols 1- Read these instructions. 5- WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture. 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 produce heat. [. . . ] Check the loudspeaker's specifications and use the 33 Hz filter if the loudspeaker's low frequency capability does not extend below 33 Hz. ·Set to FULL when driving loudspeakers that have low frequency capability below 33 Hz or in studio monitoring applications. ·Set to 33 Hz for loudspeakers which are not rated for frequencies below 33 Hz. 6 Inputs Each channel has a balanced XLR (female) and 1/4-inch TRS input. The XLR and TRS connectors for each channel are wired in parallel and can be used for "daisy chaining" 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. Do not attempt to connect more than one input signal to a given channel. Balanced connections are recommended to reduce AC hum and interference, especially with long cable runs. Unbalanced connections may be suitable for short cables. The signal's source impedance should be less than 600 ohms. Input connectors and pinout chart (PLX1802 shown) Input Pinouts Balanced inputs: Connect to the plug as shown. XLR TRS PLX 1104 and PLX 1804 models can parallel the input signal to both channels by using a jumper from one channel to the next: Unbalanced inputs: Connect to the plug as shown. If using an XLR connector, Pin 3 and pin 1 must be connected with a jumper as shown. If using a TRS connector, the ring and sleeve must be connected with a jumper. If a TS connector is used, the sleeve will provide the "jumper" when inserted into the input jack. ·Connect the input signal to either of Channel 1's input connectors. ·Connect a jumper from Channel 1's unused connector to either of Channel 2's input connectors. Make all connections with amplifier turned off. Risk of hazardous energy! 8 LED Indicators The LED indicators can be used to monitor system operation and identify common problems. POWER (PWR): BLUE 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. [. . . ] Using too many speakers may trigger limiting and cause a loss of volume. ·Internal current limits protect the output transistors against overloading. Moderate overloading will trigger clip limiting, and smoothly reduce output level to prevent distortion. Severe overloading, such as driving the amplifier hard into a shorted speaker wire, may cause short, rapid muting. [. . . ]