LAB GRUPPEN D 40:4L_US1 4000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing and Digital Audio Networking for Installation Applications (D 40:4L_US1)

Vendor: Lab Gruppen
LAB GRUPPEN D 40:4L_US1 4000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing, and Digital Audio Networking for Installation Applications (D 40:4L_US1) The D 40:4L unites 4000 W of adaptable power with...

LAB GRUPPEN D 40:4L_US1 4000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing, and Digital Audio Networking for Installation Applications (D 40:4L_US1)

The D 40:4L unites 4000 W of adaptable power with cutting-edge LAKE DSP, DANTE Digital Audio Networking, and Advanced System Integrity Monitoring. Built upon the formidable foundation of our esteemed PLM Series, renowned for reliability and sonic prowess across the most demanding concert tours and extensive installations, the D 40:4L is crafted for digitally networked sound applications in expansive venues like stadiums, arenas, theme parks, and more. This series integrates refined output stage technologies and installation-centric hardware and software features. These innovations optimize amplifier system configuration, reducing initial equipment costs and long-term energy consumption for both integrators and end users.

Rational Power Management (RPM)

At the heart of the D Series stands Rational Power Management (RPM), a LAB GRUPPEN innovation empowering system designers and integrators with unprecedented control over power allocation for optimal performance under diverse load conditions. RPM not only curtails initial equipment expenses but also minimizes rack space requirements. Unlike traditional amplifiers, where over-specification for one channel often results in wasted power across others, RPM allows for dynamic power allocation among the four channels of the D 40:4L. This enables scaling up any channel as needed while efficiently distributing the remaining power to handle less demanding loads elsewhere.

CAFE for Green Credentials

The D 40:4L offers seamless configuration and monitoring through the advanced CAFE (Configuring Amplifiers For the Environment) software suite. Beyond enabling comprehensive system surveillance and RPM feature customization, CAFE introduces the Equipment Specification Predictor (ESP). This innovative tool analyzes system and load requirements to recommend ideal specifications for the D Series units, encompassing model selection, quantity needed, heat generation, channel distribution, and current draw. The outcome ensures precise mains management and accurate specifications for cooling systems and UPS, if necessary.

The Power of LAKE Processing

The D Series LAKE amplifiers offer unparalleled input versatility, powered by exclusive LAKE processing algorithms for outstanding performance. With robust control and load monitoring through the LAKE Controller, seamless integration into Dante digital audio networks, and compatibility with popular networked digital matrix systems via third-party middleware, these models ensure extensive connectivity. Equipped with four comprehensive LAKE Processing modules delivering discrete audio throughput channels, they support analog, AES3 digital, and dual redundant Dante networked digital inputs. Each channel offers individual signal selection and programmable failover to analog for added flexibility. Moreover, the onboard LAKE processor includes advanced group control with Raised Cosine™ MESA EQ™ asymmetric filters, while the LimiterMax™ peak and RMS limiters set industry standards for loudspeaker protection and sonic transparency.


  • 4,000 Watt amplifier with 4 flexible output channels and up to 2,000 Watts channel output

  • 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 800 Watts into 2 Ohms, 4 x 1,000 Watts into 2.67 Ohms, 4 x 1,000 Watts into 4 Ohms, 4 x 1,000 Watts into 8 Ohms, 4 x 700 Watts into 16 Ohms, 4 x 500 Watts into Hi-Z 25 V, 4 x 1,450 Watts into Hi-Z 70 V, 4 x 2,000 Watts into Hi-Z 100 V

  • Proven and reliable IDEEA Class D Output Stage with direct drive 70 and 100 V constant voltage systems as well as low impedance

  • Rational Power Management (RPM) provides total flexibility to allocate available power across all 4 output channels for the most efficient use of system inventory

  • Best-in-class Power Factor Correction (PFC) and switch mode power supply reduces running costs and minimizes environmental impact

  • Breaker Emulation Limiter (BEL) with configurable mains current draw threshold and breaker profile to safeguard mains breakers from tripping

  • Configurable Auto Power Down and Adaptive Rail Control enable real-world lifetime energy savings

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

  • Dedicated on-board surveillance and load monitoring for mass notification applications

  • Redundant audio inputs and on-board system surveillance for voice alarm systems

  • CAFE (Configuring Amplifiers For the Environment) software for design, system planning, equipment planning, installation and commissioning

  • Control and monitoring integration with 3rd-party matrix systems including MediaMatrix and Q-Sys via dedicated interfacing software

  • Dedicated front-panel mute buttons for each amplifier channel with bicolor LED indication

  • 4 "Lake Class" analog input channels with Iso-Float ground isolation for reliable audio distribution

  • 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 digital audio inputs and amplifier outputs on plug-in Phoenix connectors

  • Detachable and locking IEC mains cable rated at 250 V / 16 A with a variety of wall plugs selectable on order

  • Removable dust filter grille for increased air circulation and simple maintenance

  • Rugged slimline (1U) rackmount chassis including rear support brackets for ease of installation

Processing / Network

Lake / Dante

Number of amplifier channels


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

4000 W

Max output power (all channels driven)1
2 ohms

800 W

2.67 ohms

1000 W

4 ohms

1000 W

8 ohms

1000 W

16 ohms

700 W

Hi-Z 25 V

500 W

Hi-Z 70 V

1000 W

Hi-Z 100 V

1000 W

Max output power single channel (all models)1
2 ohms

850 W

2.67 ohms

1150 W

4 ohms

1750 W

8 ohms

1350 W

16 ohms

700 W

Hi-Z 25 V

500 W

Hi-Z 70 V

1450 W

Hi-Z 100 V

2000 W

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

150 Vpk

Max output Current

30 Apk

Rational Power Management (RPM)

Share “Total burst power” of the product freely among channels. Any channel can scale up to the “single channel max power”

Default voltage limitation (can be lifted with RPM configuration)

145 Vpk

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

Amplifier platform
Inter Sample Voltage Peak Limiter (ISVPL)

Configurable Peak voltage threshold and profile

Amplifier gain

Digital configurable amplifier gain 22 - 44 dB

Dynamic range

> 112 dB

Load impedance analysis


Temperature control

Temperature regulated fans (front-to-rear airflow) and show must go on limitation (ATL, PTL)

Internal Sample Rate / Data path

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

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

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)


Back panel Interface
Analog inputs

4 x Terminal block connectors analog input with +, - and ground

AES inputs

4 x Terminal block connectors analog input with +, - and ground

Output connectors

4 x 2 pole Terminal block connectors rated at 1000 V / 41 A (exceeding amplifier capacity) Can take up to 8 mm2 (8.2 AWG) cables

Ethernet Ports

2 x EtherCon RJ45 Lake Controller, Dante controller and/or DLM (3rd party protocol)

Detachable mains cord

Detachable locking 3-pin IEC rated at 250 V / 16 A

Front-panel user interface
System status indication

3 x tri-color LED. FRAME, TEMP, PSU for device status indication

Channel status indication

3 x tri-color LED per channel. Status indication separated for channel LOAD, AMP, SIGNAL status


Per channel touch button for MUTE control and tri-color LED for indication


Touch button for ON/STANDBY control and tri-color LED for power state indication


Touch button and LED for bidirectional device software select functionality

Mains Power
Nominal voltage

100 - 240 Volt AC 50 - 60 Hz

Operating voltage

70 - 265 V AC 45 - 66 Hz

Mains wall plug

Selectable on order CEE 7/7 “Schuko” 230 V / 16 A, NEMA 5-15 125 V / 15 A, BS1363-A 250 V / 13 A, IA16A3 250 V / 16 A, AU/NZ 250 V / 10 A, JP 125 V / 15 A, CPCS-CCC 250 V / 10 A

Power supply features
Soft start / Inrush power


Power factor correction

> 0.98 for mains power > 300 W

Regulated switch mode power supply (R.SMPS)


Breaker Emulation Limiter (BEL)

Configurable current threshold and breaker profile

BEL max current threshold

15 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: 44 mm (1 U), D: 425 mm (16.7”)

Overall depth front-rear support

D: 463 mm


8.3 kg (18.3 lbs)


Black painted steel chassis with grey painted steel front with detachable grille