QSC Audio PLX 3602, PLX 1804, PLX 1802, PLX 2502, PLX 3102 User Manual
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.
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 produce heat.
9- Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other.
A grounding plug has two blades and a grounding prong. The wide blade or third prong are provided for your safety. If the provided plug
does not fit your outlet, consult an electrician for the replacement of the obsolete outlet.
10- Protect the power cord from being walked on or pinched, particularly plugs, convenience receptacles, and the point where they exit
from the apparatus.
11- Use only attachments/accessories specified by QSC Audio Products, Inc.
12- Use only with hardware, brackets, stands, and components sold with the apparatus or by QSC Audio Products, Inc.
13- Unplug the apparatus during lightning storms or when unused for long periods of time.
14- Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as
power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally, or has been dropped.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important ope rating and maintenance (servicing) instructions in this manual.
The lightning flashes printed next to the OUTPUT terminals of the amplifier are intended to alert the user to the risk of hazardous
energy. Output connectors that could pose a risk are marked with the lightning flash. Do not touch output terminals while amplifier
power is on. Make all connections with amplifier turned off.
The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated "dangerous" voltage within the product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock
to humans.
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE THE COVER. NO USER-SERVICEABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED PERSONNEL.
WARNING: To prevent fire or electric shock, do not expose this equipme nt to rain or moisture.
FCC INTERFERENCE STATEMENT
NOTE: This equipment has been tested and found to comply with the limits fo r a class B digital device, pursuant to part 15 of the FCC rules. These limits are
designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio
frequency energy and if not installed and used in accordance to the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by switching the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following
measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and the receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio or TV technician for help.
© Copyright 2006, QSC Audio Products, Inc.
QSC® is a registered trademark of QSC Audio Products, Inc.
"QSC" and the QSC logo are registered with the U.S. Patent and Trademark Office
Speakon® is a registered trademark of Neutrik Inc. All trademarks are the property of their respective owners.
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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 illustration 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-performance, compact, and light weight switching power supply
•Complete amplifier protection
•XLR and 1/4-inch TRS balanced input connectors
•Gain controls are recessed and 21-step detented
•Active inrush current limiting eliminates need for power sequencing
•LED indicators for power, input signal presence, -10 dB, and clip/protect
•Rear chassis tabs and front panel design protect controls and connectors
In addition, the PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models feature:
•2-ohm minimum impedance
•Bridgeable output
•Binding post loudspeaker connections
•Clip limiter
•33 Hz low frequency filter
•Low-cut/full-range/high-cut selector
•Stereo/bridge mode/parallel input selector
•Front panel LED indicators for parallel and bridge modes
Unpacking
Factory packed carton contains:
•PLX amplifier
•User's manual
•Adhesive rubber feet (for non-rack mount applications)
•IEC-type detachable power cord
Use the same type carton when shipping the amplifier.
Front Panel
1- Power Switch
2- Cooling Air Exhaust Vents
3- LED Indicators
4- Gain Controls
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Rear Panel
1- Input Configuration switch
2- 1/4-inch TRS input connectors
3- XLR female input connectors
4- Low Frequency Filter switches
5- Speakon output connectors
6- Binding post output connectors
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 supporting the rear of the amplifier. A rear rack ear kit is available
from QSC’s Technical Services Group.
The cast front panel includes finger grips at each end, making lifting and setting into the rack more comfortable.
7- Cooling air inlet vents
8- Clip Limiter switch
9- Serial number plate
10- IEC-type AC mains inlet
11- Circuit breaker, resettable
The front panel casting includes features for
finger-lifting and gripping at each end.
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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 amplifier.
NOTE: Turn off the AC power switch before connecting AC power.
Connect the AC mains plug to a suitable AC mains outlet.
The correct AC line voltage is shown on the serial number
label, on the rear panel. Connecting to the wrong line
voltage may damage the amplifier or increase the risk of
electric shock.
Air flow in QSC amplifiers: Cool air is drawn into the
rear of the amplifier by the cooling fan. Warm air exits
the front of the amplifier.
Orient the IEC connector with the connector prongs in
the socket, then push the connector firmly into the IEC
socket until fully seated.
The rear chassis ear can be used to retain the IEC power
connector. After inserting the IEC block into the receptacle, use a wire-tie or similar device to secure the cord to
the chassis ear.
AC Mains Current Draw
The table at the right provides typical current draw for each model as
a function of load and output power level. Units of measurement are
amperes rms.
NOTE! Current draw shown is for 120 VAC line. For 230
VAC models, multiply values shown by 0.5.
•1/8 power (pink noise) represents typical program with occasional clipping. Use this rating for most applications.
•1/3 power (pink noise) represents severe program with heavy
clipping.
•Full power (sine) is continuous sine wave driven at 1% clipping.
•PLX 1802, PLX 2502, PLX 3102, and PLX 3602 models: Thermal
or overcurrent cutback limits duration of full power 2 ohm
operation. Long term, active limiting to 30A at 120V.
•PLX 1104 and PLX 1804 models: Long-term, circuit breaker limited to 15A at 120V.
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