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.
2 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- ...
3 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 ...
4 rack mounting use four screws and washers to mount the amplifier to the equipment rack rails. To use the amplifier outside a rack, attach the self-adhesive rubber feet to the bottom. For portable, mobile, or other applications where the rack assembly may be moved, we strongly recommend support- in...
5 cooling air flows from the rack, into the back of the amplifier, and out the 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 amplifie...
6 input configuration switch (plx 1802/2502/3102/3602 models only) 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...
7 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 chain- ing” an input signal to additional amplifiers. The input impedance is 20k ohm balanced or 10k ohm unbalanced. Both xlr and trs...
8 outputs the plx 1104 and plx 1804 models are equipped with speakon output 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 marking...
9 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 indicat...
10 gain controls 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 rang...
11 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 redu...
12 specifications plx 1104, plx 1804 plx 1104 plx 1804 output power (watts) (1) 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 respons...
13 specifications plx 1802, plx 2502, plx 3102, plx 3602 plx 1802 plx 2502 plx 3102 plx 3602 output power (watts) (1) 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...
14 appendix a: speakon wiring reference amplifier connection to loudspeaker two-wire, single-channel connection four-wire, two-channel connection bridge mode connection note! Ensure proper polarity when connecting bridge mode output!.
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