QSC Audio PLX 1804 manual

PLX Series Professional Audio Amplifiers User Manual 4-ohm minimum imped ance models with Sp eakon ® output termina ls: PLX 1104 PLX 1804 2-ohm minimum imped ance models with Sp eakon and bindin g po st terminals: PLX 1802 PLX 2502 PLX 3102 PLX 3602 *TD-000214-00* TD-000214-001Rev .C[...]

2 Important Safety Precautions & Explanation of Symbols 1- Read these instructions. 2- Keep these instructions. 3- Heed all warn ings. 4- Follow all instr ucti ons. 5- WARNING: T o prevent fire or electric shock, do not expose this equ ipment to rain or moistu re. Do n ot use this appara tus ne ar water . 6- Clean only with a dry clo th. 7- Do [...]

3 Introduction Thank you for purchasing this QSC power amplifier . Please read t he 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 110 4 and 1804 models, while the PLX 3602 illus- tration is representative of the PLX 1802, PLX 250 2, P[...]

4 Rack Mounting Use four screws and washers to mount the amplifier to the equipment rack rails. T o 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- ing the rear of the amplifier . A rear rack ear kit[...]

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 vent s! AC Mains Connection Connect AC power to the IEC socket on the back of the amplifier . NOTE: T urn off the AC power switch before c[...]

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 independent, and each may be used for a dif[...]

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 inputs are connected with standard cables an[...]

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 markings and maintain consistent loudspeaker polarity for[...]

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 indication: •Illuminates whenever the amplifier i[...]

10 Gain Controls T urn the GAIN controls clockwise to increase gain and counter clockwise to decre ase 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 fo[...]

11 Protection Sy stems 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 seve re overdrive. This protects speakers and somewhat reduces the load on the amplifier . •Internal cu[...]

12 Specifications PL X 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 RESPONSE 20 - 20k Hz, ±0.5 dB, all models SIGNAL to NOI[...]

13 Specifications PLX 1802, PL X 2502, PLX 3102, PLX 3602 PLX 1802 PLX 2502 PLX 3102 PLX 3602 OUTPUT POWER (W atts) (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/Ch. 575 750 1000 1250 1k Hz, 0.1% THD (EIA), 2[...]

14 Appendix A: Speakon Wiring Reference Amplifier co nnection T o loudspeaker T wo-wire, si ngle-channel conn ection Four -wire, two-channel connect ion Bridge mode connect ion NOTE! Ensure proper polari ty when connecting bridge mo de output![...]

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