QSC PLD Amplifier


PLD Series Processing Amplifiers represent a revolutionary advancement in technology and innovation. Featuring Flexible Amplifier Summing Technology™ (FAST), advanced DSP and loudspeaker management, next-generation Class D amplification with Power Factor Correction (PFC), and an unmatched user experience, PLD provides robust and extraordinarily high fidelity power to drive multiple channels and configurations of loudspeakers with minimal operator complexity.

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.

E Series Entertainment System DSP Tunings are now available for PLD processing amplifiers.

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  • 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.

General Specifications

PLD4.2 PLD4.3 PLD4.5
Typical Distortion 0.01–0.06%
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 38.4 dB 38.4 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

PLD4.2 PLD4.3 PLD4.5
Peak Continuous Peak Continuous Peak Continuous
4 Independent Channels
A, B, C, D
500 W 400 W 900 W 625 W 1200 W 1150 W
 4Ω 700 W 400 W 1400 W 625 W 2000 W 1250 W
 2Ω 625 W  325 W 1200 W 625 W 1600 W 625 W
2 Channel BTL Bridged
A+B or C+D
Doubles Voltage
1200 W 800 W 2400 W 1250 W 4000 W 2250 W
1500 W 600 W NR* NR* NR* NR*
2 Channel Parallel
AB or CD
Doubles Current
500 W 400 W 1300 W 1150 W 1250 W 1150 W
950 W 800 W 2000 W 1250 W 2400 W 2250 W
1200 W 800 W 2500 W 1250 W 4000 W 2100 W
1 Channel 3CH Parallel
Triples Current
500 W 400 W 1400 W 1150 W 1400 W 1150 W
950 W 800 W 2400 W 2000 W 2500 W 2400 W
1800 W 1200 W 3500 W 2500 W 4500 W 4100 W
1 Channel Bridged/Parallel
Doubles Current and Voltage
1600 W 1500 W 3500 W 2500 W 4500 W 4200 W
2500 W 1600 W 5000 W 2500 W 7500 W 4200 W
1 Channel 4CH Parallel
Quadruples Current
500 W 400 W 1400 W 1150 W 1600 W 1150 W
1000 W 800 W 3000 W 2500 W 3000 W 2300 W
1700 W 1600 W 5000 W 2500 W 5300 W 4200 W

NR* = Not Recommended due to excessive current draw
BOLD = Optimal configuration fo rthe load and channel count

Controls, Indicators and Connections

PLD4.2 PLD4.3 PLD4.5
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

PLD4.2 PLD4.3 PLD4.5
Dimensions (HWD) inches 3.5 x 19 x 12 3.5 x 19 x 16 3.5 x 19 x 16
Dimensions (HWD) mm 89 × 482 × 305 89 × 482 × 406 89 × 482 × 406
Weight, Net / Shipping 18.5 lb (8.4 kg) / 22 lb (10.0 kg) 21.0 lb (9.5 kg) / 25 lb (11.3 kg) 22.0 lb (10.0 kg) / 26 lb (11.8 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

All specifications are subject to change without notice.


Additional information

Weight N/A
Dimensions N/A



PLD4.2, PLD4.3, PLD4.5


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