LAB GRUPPEN PLM 20K44 SP_002 20,000W Amplifier with 4 Flexible Output-Channels on SpeakON Connectors, Lake Digital Signal Processing and Digital Audio Networking for Touring Applications (PLM 20K44 SP_002)

Vendor: Lab Gruppen
LAB GRUPPEN PLM 20K44 SP_002 20,000W Amplifier with 4 Flexible Output-Channels on SpeakON Connectors, Lake Digital Signal Processing and Digital Audio Networking for Touring Applications (PLM 20K44 SP_002) The PLM 20K44 Combines a...

LAB GRUPPEN PLM 20K44 SP_002 20,000W Amplifier with 4 Flexible Output-Channels on SpeakON Connectors, Lake Digital Signal Processing and Digital Audio Networking for Touring Applications (PLM 20K44 SP_002)

The PLM 20K44 Combines a 4-in, 4-Out Configuration With Industry-Standard Dante Networking, Setting The Benchmark For a Powered Loudspeaker Management System.

The PLM 20K44 continues the legacy of Lab Gruppen's renowned touring systems like the iconic PLM 20000Q. With an expanded 4-in, 4-out setup doubled processing power via the latest Lake Controller 6.3 release, and industry-standard Dante® networking, it sets a new standard for Powered Loudspeaker Management Systems. Featuring four channels of robust amplification paired with unmatched signal processing, it embodies seamless integration across all components—networking, audio I/O, signal processing, amplifiers, power supply, and mains supply. This comprehensive integration delivers unparalleled control and monitoring capabilities, offering distinctive operational advantages.

The Power of Lake Processing

The PLM 20K44 is powered by exclusive Lake Processing algorithms, hosting four full-featured Lake modules with discrete channels of audio throughput from input to output. You have the flexibility to select audio signals from analog or digital inputs—four analog channels with Iso-Float ground isolation, four channels via AES3 digital inputs, and eight dual redundant Dante networked digital inputs. Each channel allows individual signal selection with programmable failover to a lower prioritized input. Within the onboard Lake Processor, you'll find comprehensive features including group control, Raised Cosine MESA EQ asymmetric filters, and LimiterMax peak and RMS limiters, setting high standards for loudspeaker protection and sonic transparency. The bundled Lake Controller software serves as a unified interface for controlling Lake functions and comprehensive monitoring of amplifier status and connected loudspeaker loads. Designed for ease of use, it's optimized for wireless tablet PCs, providing an intuitive experience akin to real-time analog controls. Moreover, it seamlessly integrates with third-party sound system measurement, optimization, and control software, allowing simultaneous measurement of spectrum and transfer function adjustments within the same user interface. Lake Processing offers classical crossovers (selectable up to 48 dB per octave) and linear-phase crossovers capable of slopes exceeding 180 dB per octave. This extensive capability ensures greater control to mitigate issues like lobing and off-axis cancellation.

CAFÉ for Green Credentials

CAFÉ (Configuring Amplifiers For the Environment) is a software suite that allows the PLM 20K44 to be easily configured and monitored in the most efficient manner possible. In addition to providing comprehensive system surveillance and configuration of amplifier features such as ISVPL and Breaker Emulation Limiter (BEL), CAFÉ also includes valuable help to save the environment. CAFÉ can accurately predict estimations of average mains current draw and generated heat, and utilizing the PLM+ Series’ innovative power supply technologies in combination with BEL the mains draw can be safeguarded to a predicted level. The end result is precise mains management and thermal control, which allows more accurate provision of mains distribution, cabling and cooling. CAFÉ reduces lifetime running costs and minimizes environmental impact, and also reduces demands on UPS systems. In addition CAFÉ also features Equipment Specification Predictor (ESP): an innovative design aid that examines the system SPL and speaker requirements and transforms that data into circuit and amplifier channel requirements. On a system level, CAFÉ supplies a recommendation for optimized placement of channels into amplifiers for the most cost effective solution, including quantities of PLM+ series models for the most rational equipment, thereby minimizing wasted headroom.

Allocate Power Where It Is Needed

RPM Provides ultimate flexibility of power output allocation across channels to match specific load requirements, enabling more efficient use of amplifier inventory.

More is More: Power, Performance, and Processing

PLM+ offers unprecedented levels of refined performance, double the processing power, and even better overall efficiency – proven, tested and trusted.

CAFÉ with ESP: Configuration, Control, and Monitoring

Lab Gruppen’s dedicated integrated software provides comprehensive system surveillance, reducing running costs and minimizing environmental impact.


  • 20,000 Watt amplifier with 4 flexible output channels and up to 5,900 Watts channel output for touring applications

  • Lake digital signal processing for unparalleled loudspeaker management and system control

  • Integrated 8x8 channels of dual redundant Dante digital audio networking with AES67 support

  • 4 x 4,400 Watts into 2 Ohms, 4 x 5,000 Watts into 2.67 Ohms, 4 x 4,400 Watts into 4 Ohms, 4 x 2,300 Watts into 8 Ohms, 4 x 1,150 Watts into 16 Ohms, 4 x 3,300 Watts into Hi-Z 70 V, 4 x 4700 Watts into Hi-Z 100 V

  • Proven and reliable Class-TD output stage with proprietary Intercooler high-efficiency cooling system

  • Rational Power Management (RPM) provides total flexibility to allocate available power across all 4 output channels

  • Best-in-class Power Factor Correction (PFC) with Current Draw Modelling reduces running costs and minimizes environmental impact

  • Under-Voltage Limiting (UVL) for continued operation during severe mains supply voltage drops

  • Dedicated on-board surveillance and load monitoring for complete peace of mind

  • Redundant audio inputs and onboard system surveillance for full system security

  • Backlit, white-on-black front panel display and menu navigation buttons

  • 100 user presets for simple and efficient system configuration and set-up

  • 3 front-to-rear airflow fans with temperature control for optimal speed and reduced noise

  • 4 "Lake Class" analog input channels with Iso-Float ground isolation

  • 4 input channels of AES/EBU (AES3) digital audio supporting all standard sample rates up to 192 kHz with 24-bit resolution

  • 2 Neutrik etherCON RJ-45 ports provide dual redundant Dante interfaces and remote configuration via Lake Controller and Dante Controller software

  • Balanced analog and AES/EBU audio inputs on Neutrik XLR connectors

  • 1 NLT8 and 2 NLT4 Neutrik speakON output connectors

  • Detachable Neutrik powerCON cable rated at 250 V / 32 A

  • Removable dust filter grilles for increased air circulation

  • Rugged 2U rackmount chassis for durability in touring applications

Processing / Network

Lake / Dante

Number of amplifier channels


Total burst power all channels (share among channels with RPM)

20000 W

Max output power (all channels driven)1
2 ohms

4400 W

2.67 ohms

5000 W

4 ohms

4400 W

8 ohms

2300 W

16 ohms

1150 W

Hi-Z 70 V

3300 W

Hi-Z 100 V

4700 W

Max output power single channel1
2 ohms

4400 W

2.67 ohms

5900 W

4 ohms

4600 W

8 ohms

2300 W

16 ohms

1150 W

Hi-Z 70 V

3300 W

Hi-Z 100 V

4700 W

Amplifier output modules (all models, all channels)
Peak output voltage

194 V

Max. output current

67 A

Rational Power Management (RPM)

Regardless of model, any channel has potential to deliver the max single channel output power

Default voltage limitation (can be lifted with RPM configuration)

194 V

Protection features

Current Average Limiter (CAL), Very High Frequency Protection (VHF), Direct Current Protection (DC), Short Circuit Protection, Current-Clip Limiter, Voltage Clip Limiter, Temperature protection

Audio Performance (Amplifier platform with digital input)
THD + N 20 Hz - 20 kHz for 1 W

< 0.05 %

THD + N at 1 kHz and 1 dB below clipping

< 0.04 %

Dynamic range

> 114 dB

Channel separation (Crosstalk) at 1 kHz

> 70 dB

Frequency response (1 W into 8 Ohm, 20 Hz - 20 kHz)

+/- 0.05 dB

Internal Sample Rate / Data path

48 / 96 kHz / 32 bit floating point

Product propagation delay AES 96 kHz / analog input

1.61 / 1.68 ms

Lake processing
Loudspeaker processing

Up to 4 modules of Classic/linear-phase/FIR crossover, EQ, delay, LimiterMax™ - peak and RMS limiters

System tuning

Group control with Raised Cosine™ MESA EG™ asymmetric filters

Input redundancy / Matrix

Automatic 4 level input redundancy / 4 input mixers

System integration

Comprehensive 3rd party protocol over UDP Ethernet

Measurement & Analysis
Pilot tone generation and analysis


Load impedance analysis


Real Time Analyzer (RTA), 3rd party integration


Dante Audio Network
Dante I/O

8 x 8

Network topology / redundancy

Flexible topology / Supports daisy-chained and Dual redundant networks

Sample Rates / Transport

48, 96 kHz / Uni + Multicast

Network latency

0.25, 0.5, 1.0, 2.0, 5.0 ms

Device presets
Local memory locations for the settings of the product


AES Inputs

4 AES inputs

Supported sample rates / resolution

44.1, 48, 88.2, 96, 176.4, 192 kHz / up to 24 bits

Sample rate conversion THD+N 20 Hz - 20 kHz unweighted


Analog Inputs

4 high quality inputs with Iso-Float ground isolation

Maximum input / digital reference

+26 dBu / +21 dBu

Sampling rate / Resolution

96 kHz / 24 bit

Input impedance balanced / unbalanced

20 / 10 kOhm

THD+N (typical at 1 kHz unweighted)


THD+N (typical at 20 Hz and 20 kHz unweighted)


Adjustable Inter-Sample Voltage Peak Limiter (ISVPL)

17.8 - 194 V, step size 0.1 V

Current Peak Limiter < 300 ms

67 A peak

Current Average Limiter (CAL) > 300 ms

33 Arms

MaxRMS (rms voltage limiter)


MaxPeak (peak voltage limiter)


Amplifier gain

22 - 44 dB, step size 0.1 dB

Output attenuator

-Inf to 0 dB, step size 0.25 dB

Back panel Interface
Analog, 2-channel I/O (input + link)

4 x 3-pin XLR, electronically balanced

AES / EBU / I/O (input + link)

2 x 3-pin XLR

Output connectors

Neutrik speakON (1 x NLT8, 2 x NLT4) or 4 Binding Posts (pairs)

Auto 10/100, Auto Uplink

2 x RJ45 etherCON

Control and monitoring interface

Via Ethernet for Lake Controller software, or DLM (the 3rd party protocol)

Detachable mains cord

Neutrik PowerCon rated at 250V/32A


Three fans, front-rear airflow, temperature controlled speed

Front-panel user interface

2.5 inch, black / white, daylight readable LCD

Fault/Warning/Limit/Clip indicators

RGB LEDs and detailed fault description on display

Mute and soft function buttons

8 provided

Standby Power button


Mute Enable button

Enables muting of outputs and inputs via soft-button keypad

Meter button

Toggles through meter views

Menu button

Provides a menu driven interface for full function front panel control

Rotary Encoder


Exit Button

Provides a “back” function

Mains Power
Nominal voltage

100 - 240 Volt AC 45 - 66 Hz

Operating voltage

70-265 V AC

Mains wall plug

NEMA L5-30 "Twist lock" 125 V / 30 A, and CEE 7/7 "Schuko" 230 V / 16 A

Power supply features
Soft start / Inrush power

Yes/ Max 8 Ampere

Power Factor Correction (PFC)


Regulated switch mode power supply (R.SMPS)


Breaker Emulation Limiter (BEL)

Configurable current threshold and breaker profile

BEL max current threshold

32 A

Power Average Limiter (PAL)


Under Voltage Limiter (UVL)


Mains undervoltage and overvoltage protection and mains glitch tolerance


Rack rail to rear panel

W: 483 mm (19"), H: 88 mm (2 U), D: 424 mm (16")

Overall depth front-rear support

D: 498 mm (19.6")


17 kg (37 lbs)


Steel painted steel chassis with black painted steel / aluminum front