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QSC PLD4.5  (QSC PLD 4.5)

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


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.
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.


4 Channels Continuous:
8 Ω: 1150 W

4 Ω: 1250 W

2 Ω: 625 W

2 Channels Continuous:

8 Ω: 2250 W

4 Ω: 2250 W

2 Ω: 2100 W

1 Channel Continuous:

8 Ω: 4200 W

4 Ω: 4200 W

2 Ω: 4250 W

1 Ω: 3700 W

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

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 38.4 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 16.00" (8.89 x 48.26 x 40.64 cm)
Weight 22.00 lb (9.98 kg)

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