QSC Audio PLX 1104 user manual Inputs, Xlr Trs

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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 and can be changed quickly. Pinouts are marked on the rear panel. Do not attempt to connect more than one input signal to a given channel.

Balanced connections are recommended to reduce AC hum and interference, espe- cially with long cable runs. Unbalanced connections may be suitable for short cables. The signal's source impedance should be less than 600 ohms.

Input Pinouts

Balanced inputs: Connect to the plug as shown.

XLR

TRS

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.

Input connectors and pinout chart (PLX1802 shown)

PLX 1104 and PLX 1804 models can parallel the input signal to both channels by using a jumper from one channel to the next:

•Connect the input signal to either of Channel 1’s input connectors.

•Connect a jumper from Channel 1’s unused con- nector to either of Channel 2’s input connectors.

XLR

TRS

TS

Input signal

TRS to TRS jumper from

Channel 1 to Channel 2

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Contents PLX PLX Series Professional Audio AmplifiersFCC Interference Statement Important Safety Precautions & Explanation of SymbolsUnpacking IntroductionFront Panel Rack Mounting Rear PanelAC Mains Connection CoolingAC Mains Current Draw Low Frequency Filters PLX 1802/2502/3102/3602 models only Clip Limiters PLX 1802/2502/3102/3602 models onlyXLR TRS InputsOutputs Speakon Output ConnectorsClip RED LED IndicatorsPower PWR Blue Signal SIG, -10 GreenGain Controls Power SwitchPLX 1802/2502/3102/3602 models Protection SystemsSpecifications PLX 1104, PLX Input Specifications PLX 1802, PLX 2502, PLX 3102, PLXAppendix a Speakon Wiring Reference Page Mailing address
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PLX 1104 specifications

The QSC Audio PLX 1104 is a versatile and powerful power amplifier designed to meet the demands of live sound applications, installations, and more. Renowned for its exceptional performance and reliable operation, the PLX 1104 has become a preferred choice for sound engineers and audio professionals alike.

One of the standout features of the PLX 1104 is its lightweight design. Weighing in at just 10.5 pounds, this amplifier is easy to transport and install, making it ideal for mobile applications. Its compact form factor allows for efficient use of space in equipment racks and allows for quick setups and takedowns during events.

The QSC PLX 1104 outputs an impressive 1,000 watts per channel at 8 ohms and 1,200 watts at 4 ohms, providing ample power for driving a wide range of loudspeakers. This capability makes it suitable for various applications, from small clubs to larger venues requiring robust sound reinforcement. The amplification system utilizes a high-efficiency design that significantly reduces power consumption and heat generation, enhancing reliability and longevity.

In terms of connectivity, the PLX 1104 features balanced XLR inputs and Neutrik Speakon outputs, ensuring compatibility with a broad array of sound systems. Its intuitive control layout, including a rear-mounted gain control for each channel, allows for easy dial-in of the desired output level.

The PLX 1104 employs QSC's advanced proprietary technology to deliver exceptional audio quality. This includes sophisticated output transistors and a high-frequency protection circuit, ensuring that the amplifier provides clean and undistorted sound, even at high output levels. Furthermore, the built-in thermal management system helps to prevent overheating, further increasing the reliability of the amplifier in demanding environments.

Additional features of the PLX 1104 include a switchable low-frequency filter that can help to improve the overall clarity of sound, particularly in live sound scenarios where low-end muddying can occur. The amplifier is also equipped with a front-panel LED status indicator that serves as a visual cue for the operational status of the unit.

In summary, the QSC Audio PLX 1104 is a testament to modern amplifier technology, combining lightweight portability with powerful performance and rich features. Its ability to deliver high-quality audio while being exceptionally user-friendly makes it a go-to solution for audio professionals who require both reliability and flexibility in diverse sound reinforcement situations.
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