Used QSC PLD4 Series
Used QSC PLD4 Series processing amplifiers bring Flexible Amplifier Summing Technology (FAST) and full onboard loudspeaker DSP to production and live sound applications, distributing total amplifier power flexibly across one to four channels. Available in variants including the PLD4.2 and PLD4.3, these second-hand units suit a wide range of loudspeaker systems and configurations. Browse the used QSC PLD4 Series listings available right now by scrolling down.
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QSC PLD4 Series specifications
| Brand | QSC |
| Segment | Audio |
About the QSC PLD4 Series
The QSC PLD4 Series processing amplifiers use Flexible Amplifier Summing Technology (FAST) to distribute total amplifier power across one, two, three, or all four channels, accommodating virtually any loudspeaker system or configuration. The PLD4.2 offers up to 700 watts per channel, while the PLD4.3 delivers up to 1400 watts per channel. Each channel features onboard DSP with crossover and parametric EQ filters, limiting, and alignment delay, removing the need for outboard loudspeaker processors. A PowerLight universal switch-mode power supply with PFC provides efficiency and low weight. The front panel includes a 400x240 LCD, LED metering, channel Select and Mute buttons, and a Preset Wizard to simplify configuration. Twenty factory presets and 50 user preset storage slots are included, along with four XLR inputs and six NL4 outputs. Intrinsic Correction processing and E Series DSP tunings further optimise performance with compatible QSC loudspeakers.
QSC PLD4 Series — buyer FAQs
What is the QSC PLD4 Series and what is it designed for?
The QSC PLD4 Series is a range of four-channel processing amplifiers built for production and live sound applications. Each model combines Flexible Amplifier Summing Technology (FAST), which distributes total amplifier power across one, two, three, or all four channels, with per-channel onboard DSP including crossover, parametric EQ, limiting, and alignment delay, removing the need for separate outboard loudspeaker processors.
What is the difference between the PLD4.2 and the PLD4.3?
The primary difference is power output per channel. The PLD4.2 delivers up to 700 watts per channel, while the PLD4.3 steps up to up to 1400 watts per channel. Both share the same four-channel FAST architecture, onboard DSP, PowerLight universal switch-mode power supply, front-panel LCD, and the same input and output connector layout of four XLR inputs and six NL4 outputs.
Who makes the PLD4 Series and where does it sit in their product range?
The PLD4 Series is made by QSC, an American audio, video, and control manufacturer with a broad professional audio portfolio covering power amplifiers, loudspeakers, and networked AV platforms. Within that range the PLD4 Series sits as a processing amplifier line aimed at production and live sound, combining amplification and loudspeaker DSP in a single unit rather than requiring a separate processor.
What presets and configuration options does a used QSC PLD4 Series amplifier include?
Each unit ships with 20 factory preset configurations that can be modified and saved across 50 user preset storage slots. A front-panel Preset Wizard simplifies setup by letting the user select from a list of popular passive loudspeakers. E Series Entertainment System DSP tunings are also available for the platform, and Intrinsic Correction processing is included to optimise performance with compatible QSC loudspeakers.
What should I check when buying a used QSC PLD4 Series amplifier?
Confirm which variant (PLD4.2 or PLD4.3) is listed, as power output differs significantly between models. Check that the front-panel LCD, LED metering, and channel Select and Mute buttons are all functional, and verify that all four XLR inputs and six NL4 outputs are undamaged. Confirm any stored user presets are accessible. Used listings on this page include a 21-day warranty covering major functional faults; full detail is in the buying guide at 10kused.com/used-av-equipment-guide/.
