QSC PLD4.5 Power Amplifier with DSP

4-channel Power Amplifier, 2,000W Peak/ch at 4 ohms, with Advanced Onboard DSP, PA Management Tools, Flexible Amplifier Summing Technology
QSC PLD4.5 Power Amplifier with DSP image 1
QSC PLD4.5 Power Amplifier with DSP image 1
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QSC PLD4.5 Power Amplifier with DSP
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Big Power and Incredible Sound-shaping Capabilities

The QSC PLD series power amps merge two essential pieces of gear into a single, lightweight unit. Not only do you get up to 5,000 watts of power spread across four channels, you also get advanced onboard DSP to shape the sound. These amps are primed to be the new centerpiece of your live sound rig.

QSC equipped the PLD amps with everything you need for the show, namely plenty of power and the ability to shape the sound to the room. This is accomplished through high-efficiency Class D amplifiers and an intricate series of DSP-powered processors. There's an impressive amount of features packed into just two rack spaces. And best of all, QSC set the PLD series up to be extremely user friendly. Plug it in and the front panel display leads you through the rest. No hassles, just awesome sound every time.

Watch this quick overview of the PLD series and its key features.

Complete Array of Built-in DSP and PA Management Tools

The PLD series equips you with everything you need for virtually any live sound gig or installation. On top of standard features such as peak and RMS limiting, you also get crossover filters, parametric EQ, and alignment delay — basically everything you used to need an external piece of rack gear to accomplish. Plus, this DSP can be applied to each output individually. Now, with the PLD power amps, you get it all, in a single 2U box.

All of this sonic firepower doesn't just simplify your setup, it makes it sound better too. The processing side and the amplification side work in conjunction to allow the DSP to monitor and respond to the amp, giving you more output without distortion. And if you're using QSC speakers, you get the added bonus of using the PLD's "Intrinsic Correction." That's a fancy way to say that the PLD amps use complex filtering and processing to analyze and compensate for non-linearities in the speaker design. Why? So your QSC speakers sound even better.

The PLD series gives you an additional level of control that will really change how you manage your PA system. Within the control panel, you can set the impedance of the individual outputs, letting you use just about any combination of speakers — regardless of the impedance — together in your rig.

Got a pair of speakers running at 4 ohms and your sub is 8 ohms? Not a problem. Just go into the control panel and set the impedance of the individual output to accommodate. This level of control is unprecedented in the world of power amps, and it gives you an incredible amount of flexibility to use whichever speakers you choose in the same rig regardless of the impedance.

Take a peek inside the PLD amplifiers and what makes them
different from a typical power amp.
Hover over features below to learn more

Screen Types

There are three screen types: Informational, Navigational, and
Parameter Editing.


The Informational screen gives you crucial pieces of information at a glance, such as the amplifier status, preset number, voltage, channel configuration, and more. You want this screen up during normal operation, so you can keep an eye on what's going on.


The Navigational screen does just that: it's the place where you move around and select items. The Control knob along with the Enter and Exit buttons are the keys to navigating this screen.

Parameter Editing

The self-explanatory Parameter Editing screen is where you set the values for virtually everything. This is the heart and soul of the PLD amp, and what you use to dial in the sound.

A walkthrough of the significant features of the PLD amplifiers.

Set Up the Output Configuration

After you've selected the type of speakers connected to the PLD amp, you can configure how the outputs are configured. You can run all four outputs parallel, bridge them in pairs, go 2-channel bridged, run 1 and 2 parallel and bridge 3 and 4, etc. These are just a few examples of how you can route the outputs. You can configure the PLD amp to meet just about any speaker and load configuration.

2-channel Configurations

3-channel Configurations

4-channel Configurations

Managing Presets

You can choose a premade preset based on your speakers and application, or you can enter the Preset Wizard and create your own presets. You can spread the output power across the four outputs any way you want, as long as the total power equals 100%. Inside the Preset Wizard, you can set up and save everything from input sensitivity for each input, output impedance, output power, and every other adjustable parameter the PLD offers. These are examples of how the Wizard presents the settings that are available for adjustment.

Preset Wizard

Step 1 — Adjust Impedance and Power

Scroll to select (Imped or Power)
To edit, press ENTER
Turn to adjust parameter
To confirm, press ENTER

Repeat for remaining
output channels
Possible Output Mode Combinations uUsing the Preset Wizard* Modes: AB = Separate Channels / A+B = Bridge Mode / AB = Parallel Mode * Percentages are used to represent the power for different amplifier models.

Step 2 — Select Output Channel for Speaker Assignment

When you are finished setting the Impedance and Power for each output, continue to scroll to access the SPEAKERS tab.

Loudspeaker assignment is optional. You can assign a loudspeaker to one or more channels, or none at all.

Step 3 — Select Speaker Type for Channel

Band and Filter selections are based on the Speaker you select. You must select a loudspeaker before selecting Band and Filter.

Step 4 — Select User Preset Number

When you have finished selecting loudspeakers, continue to scroll to access the SAVE tab.

Step 5 — Assign New User Preset Name

Indicates editing

Indicates "New Preset Name" selection

Up to 21 Characters
A-Z / a-z / 0-9 / _ / - / space

Set Up the Inputs

Step 1 — Select Input Sensitivity

Step 2 — Set Input Gain

Set Up the Outputs

Select Input Source for Each Output Channel

Flexible Amplifier Summing Technology (FAST) for Power Distribution

QSC loaded the PLD amps with Flexible Amplifier Summing Technology, or FAST for short. So what does that really mean? It means that the PLD actively distributes the total power of the amplifier in numerous combinations across one, two, three, or all four outputs. What does that mean for you? You can drive anything from four speakers to four subs to multiple subs in mono. There's almost nothing the PLD can't do for you!

User and Factory Presets to Simplify Setup

Take the pain out of setup with cleverly crafted presets. QSC loaded the PLD amps with 20 factory presets that cover the most commonly encountered setups. Along with that, the Preset Wizard takes it a step further, letting you choose your speakers from a list of common speakers for even faster setup times. Once you have your rig tweaked and dialed in, save it for blazing fast setup every time you get to the gig.

These presets can store anything from the individual output impedances to crossover frequencies to speaker profiles. If it's configurable within the PLD amplifier, you can store it for instant recall with a custom preset.

A guided tour through the FAST power distribution technology. Click here to download the
QSC PLD series PDF manual9.1mb

This chart shows examples of how the power can be distributed depending on how the load is distributed across the outputs.*

PLD 4.5 — Total Power: 5000W
8Ω Load 4Ω Load 2Ω Load
Configuration A B C D A B C D A B C D
4 CH (A B C D) 1150 1150 1150 1150 1250 1250 1250 1250 625 625 625 625
3 CH (AB C D) 1200 1150 1150 2250 1250 1250 2100 625 625
3 CH (A+B C D) 2250 1150 1150 1150 1250 1250 625 625 625
2 CH (AB CD) 1200 1200 2250 2250 2100 2100
2 CH (AB C+D) 1200 2250 2250 1150 2100 625
2 CH (A+B C+D) 2250 2250 1150 1150 625 625
2 CH (ABC D) 1150 1150 2400 1250 4100 625
1 CH (ABCD) 1150 2300 4200
1 CH (AB+CD) 4200 4250 2250

* Total wattage and distribution shown is for the PLD 4.5 only. Wattages vary by model.

Up to 5,000 Watts Available, Spread Across Four Channels

Power is all about headroom, and headroom is all about sound. Luckily with up to 5,000 watts available on the heftiest model, the PLD series has headroom in spades. Spread that power across four possible outputs, and you have a ton of applications your PLD amp will be a perfect fit for.

Space-efficient Design

So, with up to 5,000 available watts and PA management packed inside a single box, you must need a whole new rack to hold all of this, right? Nope. A single 2U box can actually replace a rack full of gear. Next time you're heading out to the gig, would you rather drag racks of gear with you or just your PLD power amp? With the largest unit weighing in at just 22 lbs., your back will thank you!

Replace a rack full of gear with the high-power punch of the QSC PLD series power amps!

Additional Media

Power Amp Buying Guide

Tech Specs

Number of Channels 4
Power Class Class-D
Watts/Side @ 8 ohms 1200W Peak, 1150W Continuous
Watts/Side @ 4 ohms 2000W Peak, 1250W Continuous
Watts/Side @ 2 ohms 1600W Peak, 625W Continuous
Inputs 4 x XLR
Outputs 6 x NL-4
Rack Spaces 2U
Height 3.5"
Depth 16"
Width 19"
Weight 22 lbs.
Manufacturer Part Number FG-220014-00

Customer Reviews

Based on 2 reviews
Write your review

Sounds great, powerful, flexible, light.

Power-amp tech is pretty mature at this point and it shows with this amp. Sound quality matches the best old school non-dsp class-H amps but with a ton of flexibility and low weight. Fan noise and noise floor are on the lower end of the spectrum. Software is easy to use and the onboard controls aren't bad if you need to make adjustments without a laptop. I bought this amp for an over the top tri-amped bass rig. It's compact enough and powerful enough to take advantage of the high powered neo woofers now available. It excels in my PA too of course. Only thing I wish it had are FIR capabilities. Can't complain too much at this price though. The early production models did have some issues but I've read they been resolved. I'm sure QSC and Sweetwater will come through if there are any problems.

4.5 blew up but Sweetwater is Perfect

We like the amp. But it blew up on us at the start of a gig. No drops, no spills, house power, tested at home for several hours and used on a few gigs and it just blew up at the start of a gig which was the first gig of a series for the customer. We had backup amps and had to use those. Before that it worked fine and was magic on power consumption. Twenty amp circuit was plenty and the unit is light and powerful. We think it was just a problem with the particular amp. When things like this fail, they generally fail early and that happened to us. We aren't afraid of QSC or this model and will use the model again in the belief it was an isolated issue. But we will also be sure to have backup as always. Sweetwater came through like a champ. Can't say enough nice things about Sweetwater. Perfect customer service.
Music background: Sound Tech & DJ
See also: Power Amps, QSC, QSC Power Amplifiers