QSC PLD4.2 Processing Amplifier

QSC PLD4.2 Processing Amplifier

QSC PLD4.2 Processing Amplifier

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QSC PLD4.2-XX Overview

  • 1Description

The QSC PLD4.2 Processing Amplifier from PLD Series is designed specifically for the needs of portable and production sound system users. It provides efficient, robust, and high-fidelity power to drive multiple channels and configurations of loudspeakers while simultaneously deploying sophisticated digital processing with minimal operator complexity. This powerful and lightweight 4-channel amplifier with onboard, advanced DSP has the capability to configure and combine channels in various ways to drive a wide range of loudspeaker systems.

The PLD4.2 Processing Amplifier features FAST (Flexible Amplifier Summing Technology) that actively distributes the total amplifier power in various combinations across 1, 2, 3, or all 4 outputs. This flexibility allows PLD Series amplifiers to drive (for example) 4 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.

This amplifier uses QSC fourth generation class-D power amp design in combination with a custom power stage utilizing a purpose-built output device. This MOSFET device provides high voltage operation without needing a full bridge output and offers good audio quality due to co-location of the semiconductors. Additionally, it benefits from the PowerLight power supply, further enhanced with PFC (Power Factor Correction) that aligns the current waveform with the AC mains voltage waveform. PFC enables this amplifier to draw current from the wall in an efficient and controlled manner resulting in power from a single standard AC breaker. Additionally, it offers multi-stage sleep modes, saving energy when possible without ever sacrificing performance. The result is a powerful and flexible platform that offers low weight and efficiency.

The PLD4.2 Processing Amplifier also doubles as a loudspeaker processor. The close integration of processing and amplification allows the DSP to monitor and respond to amplifier behavior, making dynamics processing accurate and effective. 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 4 channels of crossover filters, parametric EQ, and alignment delay - everything needed to optimize a loudspeaker system. The amplifier also offers Intrinsic Correction, a combination of IIR and FIR Filtering and loudspeaker processing methodology. Intrinsic Correction compensates for the non-linearities in loudspeaker array and horn design and results in good performance from your QSC loudspeakers (sold separately).

The on-board processing is managed and stored as presets, with 20 factory presets for the most common loudspeaker applications. For great customization, the built-in Preset Wizard streamlines amplifier setup and provides loudspeaker selection of passive loudspeakers (sold separately).

With 4 channels of amplification plus drive rack signal processing in just 2RU, this amplifier replaces equipment taking up as much as 3 times the rack space.

With a dedicated front panel UI complete with LED meters and indicators, a 400 x 240 TFT color display, a rotary encoder and ergonomic navigation buttons, this amplifier provides an intuitive interface for the user to control the system. The complete system can be set up in mere minutes.

FAST (Flexible Amplifier Summing Technology) drives most any loudspeaker system or configuration by distributing total amplifier power across 1, 2, 3, or all 4 channels
4 channels of full function onboard loudspeaker DSP with crossover and parametric EQ filters, limiting and alignment delay eliminate the need for outboard loudspeaker processors
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 efficiency, good audio performance, and low weight
4 input XLR connectors, and 6 NL-4 output connectors
Integrated front panel with channel select and mute buttons, input and output LED metering, 400 x 240 LCD, intuitive navigation buttons, LED power button and indicator, and cast aluminum handles
Preset Wizard simplifies amplifier configuration providing loudspeaker selection from a list of passive speakers
UPC: 428406128706
In the Box
QSC PLD4.2 Processing Amplifier
  • Locking IEC Cable
  • USB Cable
  • Limited 3-Year Warranty
  • Table of Contents
    • 1Description

    QSC PLD4.2-XX Specs

    Channels 4 Channels Continuous:

    8 Ω: 400 W

    4 Ω: 400 W

    2 Ω: 325 W

    2 Channels Continuous:

    8 Ω: 800 W

    4 Ω: 800 W

    2 Ω: 650 W

    1 Channel Continuous:

    8 Ω: 1600 W

    4 Ω: 1600 W

    2 Ω: 1600 W

    1 Ω: 1600 W 

    1-1.0 kHz sine wave, 1% THD, 1 channel driven

    Distortion Typical Distortion:

    8 Ω: 0.01 to 0.03%

    4 Ω: 0.03 to 0.06%

    Maximum Distortion:

    4 to 8 Ω: 1.0%

    20 Hz to 15 kHz +/- 0.2 dB

    Frequency Response 20 Hz to 20 kHz + 0.2 dB

    -0.7 dB (8 Ω)

    Noise Characteristics
    Output Unweighted Output Unmuted: -101 dB

    Weighted Output Muted: -109 dB

    Gain 34.0 dB (1.2 V setting)
    Damping Factor > 150
    Input Impedance > 10 k, balanced or unbalanced
    Maximum Input Level 3.9 V Setting: 12.28 V (+24 dBu)

    1.2 V Setting: 3.88 V (+14 dBu)

    Controls and Indicators Front:


    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


    AC power disconnect

    Input Connectors Female XLR
    Output Connectors NL4
    Amplifier 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 100 to 240 VAC, 50 to 60 Hz
    Agency Approval UL, CE, RoHS / WEEE compliant, FCC Class A (conducted and radiated emissions)
    Dimensions (H x W x D) 3.50 x 19.00 x 12.00" (8.89 x 48.26 x 30.48 cm)
    Weight 18.50 lb (8.39 kg)
    Packaging Info
    Package Weight 16.8 lb
    Box Dimensions (LxWxH) 23.2 x 14.5 x 6.6"

    QSC PLD4.2-XX Reviews

    4.2? Can this amp be used to send a signal to a ...

    4.2? Can this amp be used to send a signal to a powered Sub? I don't see an output for that but...
    Asked by: Andrew
    If you are using a Powered Subwoofer you do not need a power amp, because the subwoofer already has the power internally. If you could give me some more information on what you are trying to achieve I may be able to help little more I would just need some more details.
    Answered by: Product Expert
    Date published: 2019-01-30
    • y_2019, m_4, d_21, h_14CST
    • bvseo_bulk, prod_bvqa, vn_bulk_2.0.12
    • cp_1, bvpage1
    • co_hasquestionsanswers, tq_1
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    • clientName_bhphotovideo
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