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 reduces the load on the amplifier.

•Internal current limits protect the output transistors against overloading. Peak limiting may occur at full output if using more than four 8-ohm speakers per channel, or if the speaker wiring is shorted. The red Clip LED will flash brightly, and the ampli- fier may sound distorted. If the amplifier is driven hard under these conditions, the current limit will be further reduced, causing an increase in distortion. If the amplifier appears to be losing power during peaks, check the speaker wiring and number of speakers. Using Clip Limiting will reduce this distortion, but for best results do not exceed the rated loading.

•If the amplifier stops completely for several seconds after a very loud signal, it may be overloading the AC service. This only

occurs if the AC voltage sags more than 30%, and will be more likely if driving many speakers at once. Use short, heavy- gauge AC cables and do not plug too many amplifiers into a single outlet.

•In Bridge Mono, the amplifier may shut down for several seconds if driven too hard into loads less than the rated 4-ohm minimum.

•If the amplifier overheats due to prolonged overload or high external temperature, it will mute for about 30 seconds with the fan running at full speed for maximum cooling. Make sure the rear intake is getting a free flow of cool air.

PLX 1104/1804 models:

•These models have completely automatic internal protection that maintains operation even under extreme conditions.

•Overdrive distortion will cause the red Clip LED to flash. If driven constantly into clipping, internal circuitry smoothly reduces the volume to minimize distortion and stress.

•These models are rated for 4-ohm loads. Do not use more than two 8-ohm speakers per channel. Using too many speakers may trigger limiting and cause a loss of volume.

•Internal current limits protect the output transistors against overloading. Moderate overloading will trigger clip limiting, and smoothly reduce output level to prevent distortion. Severe overloading, such as driving the amplifier hard into a shorted speaker wire, may cause short, rapid muting. Check the speaker wiring for shorts if the amplifier "chatters".

•Overheating may occur due to prolonged overdrive or high external temperature. This will first trigger thermal limiting, reducing volume so that the amplifier remains below its thermal limit and keeps running. If input signals are still too high, the amplifier may eventually mute for about 30 seconds with the fan at full speed for maximum cooling. Make sure the rear intake is getting a free flow of cool air.

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QSC Audio PLX2502, PLX1804, PLX1802, PLX3102 Protection Systems, PLX 1802/2502/3102/3602 models, PLX 1104/1804 models
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PLX1802, PLX3102, PLX3602, PLX1804, PLX2502 specifications

QSC Audio has long been recognized in the professional audio industry for its commitment to high-quality amplification solutions. The PLX series, which includes models such as PLX2502, PLX1804, PLX3602, PLX3102, and PLX1802, showcases the brand's innovative technologies and robust design philosophy, catering to a wide array of applications ranging from live sound to installation.

The PLX2502 serves as a powerful amplifier capable of delivering 2,500 watts at 4 ohms. Its lightweight construction makes it easy to transport, while the efficient PowerLight™ technology helps reduce energy consumption without compromising performance. This model features dual independent channels, allowing for versatile operation and flexibility in wiring configurations.

The PLX1804, on the other hand, offers slightly lower output while still delivering a solid 1,800 watts at 4 ohms. This model combines superior sound quality with a user-friendly interface. The specially designed fan cooling system ensures that the amplifier remains efficient even during demanding performance conditions. It also comes equipped with XLR and TRS inputs, providing compatibility with a wide range of audio sources.

For those requiring even more power, the PLX3602 stands out with a massive 3,600 watts at 4 ohms. Its all-steel chassis enhances durability, making it suitable for rigorous touring environments. Additionally, the integrated DSP offers protection against overheating, short-circuits, and overloads. With its extensive range of outputs, the PLX3602 supports complex setups involving multiple speakers and driving high-demand audio systems.

The PLX3102 is another noteworthy model in the series, providing an output of 3,100 watts. This amplifier emphasizes versatility and can drive various speaker configurations efficiently. It features both binding post and Speakon outputs, ensuring secure and reliable connections, even in high-stress scenarios.

Lastly, the PLX1802 rounds out the series with 1,800 watts of power. Known for its compact size, it is particularly suited for smaller venues or as a monitor amplifier. Despite its smaller footprint, the PLX1802 retains the robust performance characteristics that QSC is known for.

Overall, the PLX series epitomizes QSC’s dedication to quality audio amplification, combining power, portability, and advanced features across an impressive range of models. With their advanced technologies, including PowerLight™ and integrated DSP, these amplifiers are designed to meet the rigorous demands of both live and installed sound applications while delivering exceptional sound quality.
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