QSC PLD4.5 Processing Amplifier

SKU: pld4.5

8000W Amplifier using FAST channel combining technology. 4 channels, 1200 watts/ch at 8Ω, 2000 watts/ch at 4Ω, 1600 watts/ch at 2Ω, with XLR and NL4 connectors.


About this item



With four flexible channels of up to 2000 watts each, a lightweight PowerLight universal power supply, DSP on-board for each channel, and all the right connectors, the QSC PLD4.5 Processing Amplifier is ideal for production and live sound applications.19


  • 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 a selection from a list of the top-selling passive loudspeakers.

General Specifications

Typical Distortion 0.01–0.06%
Maximum Distortion1.0%
Frequency response20 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
Gain1.2V34.0 dB38.4 dB38.4 dB
Damping factor>150
Input impedance>10 kΩ, balanced or unbalanced
Maximum rms input level3.9V 12.28 V (+24 dBu)
1.2V3.88 V (+14 dBu)
Amplifier and load protectionShort circuit, open circuit, thermal, RF protection. on/off muting, DC fault shutdown, active inrush limiting, input current limiting
AC Power Input4.2: 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

4 Independent Channels
A, B, C, D
500 W400 W900 W625 W1200 W1150 W
700 W400 W1400 W625 W2000 W1250 W
625 W 325 W1200 W625 W1600 W625 W
2 Channel BTL Bridged
A+B or C+D
Doubles Voltage
1200 W800 W2400 W1250 W4000 W2250 W
1500 W600 WNR*NR*NR*NR*
2 Channel Parallel
AB or CD
Doubles Current
500 W400 W1300 W1150 W1250 W1150 W
950 W800 W2000 W1250 W2400 W2250 W
1200 W800 W2500 W1250 W4000 W2100 W
1 Channel 3CH Parallel
Triples Current
500 W400 W1400 W1150 W1400 W1150 W
950 W800 W2400 W2000 W2500 W2400 W
1800 W1200 W3500 W2500 W4500 W4100 W
1 Channel Bridged/Parallel
Doubles Current and Voltage
1600 W1500 W3500 W2500 W4500 W4200 W
2500 W1600 W5000 W2500 W7500 W4200 W
1 Channel 4CH Parallel
Quadruples Current
500 W400 W1400 W1150 W1600 W1150 W
1000 W800 W3000 W2500 W3000 W2300 W
1700 W1600 W5000 W2500 W5300 W4200 W

For complete specifications of power output distribution (single, bridged, parallel channels and all combinations), please refer to the product’s User Manual.
NR* = Not Recommended due to excessive current draw
BOLD = Optimal configuration for the load and channel count

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 connectorsFemale XLR
Output connectorsNL4

Weights and Dimensions

Product Dimensions (H×W×D)89 × 482 × 305 mm
3.5 × 19 × 12 in
89 × 482 × 406 mm
3.5 × 19 × 16 in
89 × 482 × 406 mm
3.5 × 19 × 16 in
Carton Dimensions (H×W×D)610 × 460 × 178 mm
24 × 18 × 7 in
610 × 530 × 178 mm
4 × 20.9 × 7 in
610 × 530 × 178 mm
24 × 20.9 × 7 in
Net Weight8.4 kg / 18.5 lb9.5 kg / 21 lb10 kg / 22 lb
Shipping Weight10 kg / 22 lb11.4 kg / 25 lb11.8 kg / 26 lb
Agency approvalsUL, CE, RoHS/WEEE compliant, FCC Class A (conducted and radiated emissions)
Carton contentsLocking IEC cable, Quick Start Guide, USB cable


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