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 different signal.

Parallel Mode: This setting connects both inputs together. One input signal feeds both chan- nels. Do not connect different sources to each input. Each channel's Gain control and speaker connection remain independent.

Bridge Mode: This setting combines both channels into a single channel with twice the output voltage. Use only Channel 1’s input and Gain control. Set Channel 2's Gain control at minimum.

Use only one input when operating in parallel or bridge mode.

Clip Limiters (PLX 1802/2502/3102/3602 models only)

The amplifier has a clip limiter with an on-off switch. The limiter only responds to actual clipping, and automatically compensates for load and voltage variations. Clip limiting is generally recom- mended, especially to protect high frequency drivers.

•Set the switch UP (ON position) to use Clip Limiting.

•Set the switch DOWN (OFF position) to disable the clip limiter.

Low Frequency Filters (PLX 1802/2502/3102/3602 models only)

Each channel has independent filter selection of Full Range (infrasonic filter only), 33 Hz low cut, 100 Hz low cut, or 100 Hz High Cut. This allows tailoring the amplifier performance to that of the loudspeakers, offering the best possible performance from the system. Proper filtering reduces distortion and prevents amplifier overload.

TOP / FULL / SUB Switch: Select the type of loudspeaker being driven by each channel.

•Set the switch to the left for driving “top” boxes; applies 100 Hz low cut •Set the switch to the middle position for “full range” loudspeakers. •Set the switch to the rightmost position for driving subwoofers.

33 Hz (low cut) / FULL Switch: Unless the loudspeaker has extended low frequency capabil- ity, we recommend setting the filter to the 33 Hz setting. The filter should only be set to FULL (turned off) for driving subwoofers. 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.

Input Configuration selector switch

Clip Limiter ON/OFF switch

Low Frequency filter selection switches for each channel

Low Frequency filter selection table

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QSC Audio PLX 1104 user manual Clip Limiters PLX 1802/2502/3102/3602 models only
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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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