QSC PLD4.3 1400W 4-Channel Processing Amplifier


  • Our Price
  • $1,649.99
  • Regular price MSRP: $1,999.99





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Experience High Performance And Cutting Edge Live Sound Technology With The QSC PLD4.3 1400W 4-Channel Processing Amplifier 

The QSC PLD Series represents a revolutionary advancement in amplifier technology and innovation. Designed specifically for the needs of portable and production sound system users, PLD provides efficient, robust and extraordinarily high fidelity power to drive multiple channels and configurations of loudspeakers while simultaneously deploying sophisticated digital processing- all with minimal operator complexity. The PLD Series consists of three powerful, lightweight, four-channel amplifiers, each with onboard, advanced DSP and the capability to configure and combine channels in various ways to drive a wide range of loudspeaker systems. These amplifiers not only make your system perform better today, but also provide a wide and flexible range of options for future system growth.

With four flexible channels of up to 1400 watts each, lightweight PowerLight universal power supply, DSP on-board for each channel, and all the right connectors, the PLD4.3 is ideal for production and live sound applications.

Flexible Amplifier Summing Technology (FAST)- PLD amplifiers feature Flexible Amplifier Summing Technology (FAST) that actively distributes the total amplifier power in various combinations across one, two, three, or all four outputs. This flexibility allows PLD Series amplifiers to drive (for example) four full-range loudspeakers or subwoofers; a high-power subwoofer and a bi-amplified speaker; a single high-power full-range loudspeaker and subwoofer combo; or multiple power-hungry subwoofers from a single, very high output mono-block.

Advanced Amplifier Technology- The PLD Series amplifiers use QSC fourth generation class-D power amp design in combination with a custom power stage utilizing a new, purpose-built output device. These innovative MOSFET devices provide high voltage operation without needing a full bridge output and offer superior audio quality due to co-location of the semiconductors. Additionally PLD amps benefit from the famed and road-proven PowerLight power supply, further enhanced with Power Factor Correction (PFC) that aligns the current waveform with the AC mains voltage waveform. PFC enables PLD Series amps to draw current from the wall in a more efficient and controlled manner resulting in incredible power from a single standard AC breaker. Additionally, the PLD Series amps offer multi-stage sleep modes, saving energy when possible without ever sacrificing performance. The result is an exceptionally powerful and flexible platform that offers low weight and outstanding efficiency.

System Processing- PLD Series is more than just an amplifier; it is also a capable and sophisticated loudspeaker processor. The close integration of processing and amplification allows the DSP to monitor and better respond to amplifier behavior, making dynamics processing far more accurate and effective than that typically achieved with separate components. This synergistic approach employs both RMS and Peak Limiters that allow the combination of amplifier and loudspeaker to produce more output without being pushed to distortion or destruction.

In addition to the dynamics processing, the onboard DSP offers four channels of crossover filters, parametric EQ, and alignment delay - everything needed to optimize a loudspeaker system. PLD amplifiers also offer Intrinsic Correction, a combination of IIR and FIR Filtering and loudspeaker processing methodology first developed for our WideLine line array loudspeakers. Intrinsic Correction compensates for the non-linearities in loudspeaker array and horn design and results in notably superior performance from your QSC loudspeakers.

Preset Wizardry- The on-board processing is managed and stored as presets, with 20 factory presets for the most common loudspeaker

  • Flexible Amplifier Summing Technology (FAST) drives most any loudspeaker system or configuration by distributing total amplifier power across one, two, three, or all four channels.
  • Four channels of full function onboard loudspeaker DSP with crossover and parametric EQ filters, limiting and alignment delay eliminate the need for outboard loudspeaker processors.
  • E Series Entertainment System DSP Tunings are now available for PLD processing amplifiers: Visit the Amplifier Navigator Software to download and update
  • Powerful Intrinsic Correction processing maximizes the sonic performance of QSC loudspeakers.
  • 20 factory preset configurations that can be modified and stored in the 50 user presets.
  • PowerLight universal switch mode power supply with PFC for highest efficiency, improved audio performance, and low weight.
  • Four Input XLR connectors and six NL4 output connectors.
  • Integrated front panel with channel Select and Mute buttons, input and output LED metering, 400ËÇ£“ó“ï“瓆240 LCD, intuitive navigation buttons, LED power button and indicator, and cast aluminum handles.
  • Preset Wizard simplifies amplifier configuration, providing selection from a list of the top selling passive loudspeakers.


  • Typical Distortion: 0.01ËÇ£“‚“ï“’Œ“ï“ç’ú0.06%
  • Maximum Distortion: 1.0%
  • Frequency Response: 20 HzËÇ£“‚“ï“’Œ“ï“ç’ú15 kHz ËÇ£“ËÇÖËé¼0.2 dB, 20 HzËÇ£“‚“ï“’Œ“ï“ç’ú20 kHz +0.2/-0.7 dB
  • Noise-Unweighted Output Unmuted: -101 dB
  • Noise-Weighted Output Muted: -109 dB
  • Gain-1.2V: 38.4 dB 
  • Input Impedance: >10 kËÇ£“äËÇÖ, balanced or unbalanced
  • Damping Factor: >150
  • Input Impedance: >10 kËÇ£“äËÇÖ, balanced or unbalanced 
  • Maximum RMS Input Level: 3.9V = 12.28 V (+24 dBu), 1.2V = 3.88 V (+14 dBu)
  • Amplifier and Load Protection: Short circuit, open circuit, thermal, RF protection. on/off muting, DC fault shutdown, active inrush limiting, input current limiting
  • AC Power Input: Universal Power Supply 100ËÇ£“‚“ï“’Œ“ï“ç’ú240 VAC, 50ËÇ£“‚“ï“’Œ“ï“ç’ú60 Hz
  • Controls and indicators (front): Power, Channel MUTE Buttons, Channel SELECT buttons, Channel input signal and CLIP LED indicators Channel output and LIMIT LED meters, HOME, ENTER, EXIT, GAIN navigation buttons, Control knob
  • Controls and indicators (rear): AC Power Disconnect
  • Input connectors: Female XLR
  • Output connectors: NL4
  •   

Manufacturer: QSC Audio
Model: PLD4.3-NA
Warranty: See manufacturer website for details
SKU: I307581-5