QSC PLD4.2-xx 2000W Amplifier using FAST channel combining technology. 4 channels, 500 watts/ch at 8Ω, 700 watts/ch at 4Ω, 625 watts/ch at 2Ω, with XLR and NL4 connectors

Vendor: QSC
Description QSC PLD4.2-xx 2000W Amplifier using FAST channel combining technology. 4 channels, 500 watts/ch at 8Ω, 700 watts/ch at 4Ω, 625 watts/ch at 2Ω, with XLR and NL4 connectors The QSC PLD Series...
$1,149.99 $1,419.99

QSC PLD4.2-xx 2000W Amplifier using FAST channel combining technology. 4 channels, 500 watts/ch at 8Ω, 700 watts/ch at 4Ω, 625 watts/ch at 2Ω, with XLR and NL4 connectors

The QSC PLD Series is designed representing the revolutionary advancement in amplifier innovation and technology. Specifically crafted for the needs of portable and production sound system users, PLD provides robust, extraordinary and robust high fidelity power to drive multiple configurations and channels of loudspeakers while, all with minimal operator complexity, simultaneously deploying sophisticated digital processing. The PLD Series is consisting of three lightweight, fourchannel, powerful amplifiers, each equipped with advanced, onboard DSP and the capability to combine and configure channels in various ways to drive a wide range of loudspeaker systems. These amplifiers also provides a flexible and wide rang, and more, it is making your system performance much better all the time. One of it is the QSC PLD4.2 with 2000W Amplifier using FAST channel combining technology. 4 channels, 500 watts/ch at 8Ω, 700 watts/ch at 4Ω, 625 watts/ch at 2Ω, with XLR and NL4 connectors. 

The QSC PLD4.2 is best for live sound and production applications, because it is equipped with DSP on-board for each channel, with four flexible channels of up to 700 watts each, lightweight PowerLight universal power supply, and all the right connectors.

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

In combination with a custom power stage and with the PLD Series amplifiers uses QSC fourth generation class-D power amp design it is utilizing a new, purpose-built output device. Without the need a full bridge output, these innovative MOSFET devices are providing high voltage operation, and offering superior audio quality due to co-location of the semiconductors. Additionally PLD amps benefit from the roadproven and famed PowerLight power supply, greatly enhanced with Power Factor Correction (PFC) that aligns the current waveform with the AC mains voltage waveform. The PLD Series is being enabled by the PFC to draw current from the wall in a more controlled and efficient manner resulting in incredible power from a single standard AC breaker. In addition, the PLD Series amp also offer multi-stage sleep modes, it is saving energy when possible without ever compromising the performance. The result is an exceptionally flexible and powerful 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 applications. For greater customization, the built-in Preset Wizard streamlines amplifier setup and provides loudspeaker selection from a list of top selling passive loudspeakers.

Space Efficient

With four channels of amplification plus drive rack signal processing in just 2RU, the PLD Series replaces equipment taking up as much as three times the rack-space. Simple to Use With a dedicated front panel UI complete with LED meters and indicators, a 400x240 TFT color display, a rotary encoder and ergonomic navigation buttons, PLD amplifiers provide an intuitive interface for the user to control the system. The simplicity of the PLD amps is further illustrated by the fact that a complete system can be set up in mere minutes.


  • 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, 400×240 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  
Maximum Distortion   1.0%
Frequency response   20 Hz–15 kHz ±0.2 dB 
20 Hz–20 kHz +0.2/-0.7 dB
Unweighted Output Unmuted
-101 dB

Weighted Output Muted
  -109 dB
Gain 1.2V 34.0 dB
Damping factor   >150
Input impedance   >10 kΩ, 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   4.2: Universal Power Supply 100-132/200–240 VAC, 50–60 Hz
4.3/4.5: Universal Power Supply 100–240 VAC, 50–60 Hz

Power Specifications


  Peak  Continuous
4 Independent Channels
A, B, C, D

500 W 400 W
 4Ω 700 W 400 W
 2Ω 625 W  325 W
2 Channel BTL Bridged
A+B or C+D 
Doubles Voltage

1200 W 800 W
1500 W 600 W
2 Channel Parallel
AB or CD 
Doubles Current

500 W 400 W
950 W 800 W
1200 W 800 W
1 Channel 3CH Parallel
Triples Current

500 W 400 W
950 W 800 W
1800 W 1200 W
1 Channel Bridged/Parallel
Doubles Current and Voltage

1600 W 1500 W
2500 W 1600 W
1 Channel 4CH Parallel
Quadruples Current

500 W 400 W
1000 W 800 W
1700 W 1600 W

Controls, Indicators and Connections

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

Weights and Dimensions


Dimensions (HWD) inches 3.5 x 19 x 12
Dimensions (HWD) mm 89 × 482 × 305
Weight, Net / Shipping 18.5 lb (8.4 kg) / 22 lb (10.0 kg)
Agency approvals UL, CE, RoHS/WEEE compliant, FCC Class A (conducted and radiated emissions)
Carton contents Locking IEC cable, Quick Start Guide, USB cable