Lab Gruppen D20:4L : 2000w 100v 4 Channel Power Amplifier


D 20:4L

2,000 Watt Amplifier with 4 Flexible Output Channels, LAKE Digital Signal Processing and Digital Audio Networking for Installation Applications

2,000 Watt amplifier with 4 flexible output channels and up to 1,600 Watts channel output
LAKE digital signal processing for unparalleled loudspeaker management and system control
Integrated 8×8 channels of dual redundant Dante* digital audio networking with AES67 support
4 x 500 Watts into 2 Ohms, 4 x 500 Watts into 2.67 Ohms, 4 x 500 Watts into 4 Ohms, 4 x 500 Watts into 8 Ohms, 4 x 425 Watts into 16 Ohms, 4 x 500 Watts into Hi-Z 25 V, 4 x 500 Watts into Hi-Z 70 V, 4 x 250 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 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 enables 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
CAFÉ (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 bicolour 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 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
Designed and engineered in Sweden



D 20:4L Combines 2000 W of Flexible Power with the Latest LAKE DSP, DANTE Digital Audio Networking and Advanced System Integrity Monitoring.

The D 20:4L is based on the same foundation of robust, high-power amplifier technologies as our renowned PLM Series – an amplifier platform with a proven record of reliability and sonic performance on the world’s most grueling concert tours and in high-profile, large-scale installations.

With the D 20:4L, those same core technologies have been updated and refocused to provide the ultimate solution for the most demanding digitally networked installed sound applications – in stadia, arenas, theme parks, performing arts centers, racecourses and other large commercial sound installations.

In addition to legendary LAB GRUPPEN reliability and sonic excellence, the D Series incorporates newly refined outputs stage technologies along with installation-targeted hardware and software features that optimize amplifier system design and configuration. Together, these new technologies allow systems integrators to minimize both initial equipment costs and end users’ long-term energy consumption.

Rational Power Management (RPM)
At the core of the D Series platform is Rational Power Management (RPM), a proprietary LAB GRUPPEN technology that allows system designers and integrators unprecedented freedom to allocate the output power available on each channel for optimum performance with specific load conditions. RPM technology also enables the integrator to minimize initial equipment costs and reduce rack space requirement since with conventional installation amplifiers, it is often necessary to “over-specify” amplifiers to meet the maximum power demand on one channel, leaving excess power capacity wasted on the remaining channels. RPM reduces costly excess capacity by allowing re-allocation of output power capacity among the four channels – with up to two channels on the D 120:4T/Ta capable of delivering up to 5000 W power output on each channel, leaving the remaining available power to be allocated to the other channels for less demanding loads.

CAFE for Green Credentials
The D 20:4L can be configured and monitored using the new CAFE (Configuring Amplifiers For the Environment) software suite. In addition to providing comprehensive system surveillance and configuration of RPM features, CAFE includes an innovative design aid – the Equipment Specification Predictor (ESP) – that provides tools for optimum specification of D Series units. ESP examines the system and load requirements and then supplies recommendations for the installation that include model and quantity of D Series units, heat generated, channel distribution, and current draw. The end result is accurate mains management and precise specification of cooling systems and UPS, when required.

The Power of LAKE Processing
All D Series LAKE versions provide extraordinary input flexibility, the legendary power of exclusive LAKE processing algorithms, comprehensive control and load monitoring via LAKE Controller, and seamless integration into Dante digital audio networks. In addition, by employing third-party middleware, D Series LAKE versions can be integrated into on other widely used networked digital matrix systems. All D Series LAKE models incorporate four full-featured LAKE Processing modules, with four discrete channels of audio throughput input to output. Audio signals are selectable from four channels of analog (each with exclusive Iso-float ground isolation), four channels of AES3 digital, and eight dual redundant Dante networked digital inputs. Input signals are individually selectable for each channel, with programmable failover to analog. The full-featured, on-board LAKE processor includes group control with Raised Cosine™ MESA EQ™ asymmetric filters to match the responses of many loudspeaker systems. LimiterMax™ peak and RMS limiters set the industry standard for loudspeaker protection and sonic transparency.


Processing / Network : Lake / Dante
Number of amplifier channels : 4
Total burst power all channels (share among channels with RPM) : 2000 W

Max output power (all channels driven)1

2 ohms : 500 W
2.67 ohms : 500 W
4 ohms : 500 W
8 ohms : 500 W
16 ohms : 425 W
Hi-Z 25 V : 500 W
Hi-Z 70 V : 500 W
Hi-Z 100 V : 250 W

Max output power single channel (all models)1

2 ohms : 850 W
2.67 ohms : 1150 W
4 ohms : 1600 W
8 ohms : 1100 W
16 ohms : 600 W
Hi-Z 25 V : 500 W
Hi-Z 70 V : 1400 W
Hi-Z 100 V : 1000 W

Amplifier output modules (all models, all channels)

Peak output voltage : 142 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) : 100 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 : Yes
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

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 : 0.0000003

Analog Inputs

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) : 0.0000022
THD+N (typical at 20 Hz and 20 kHz unweighted) : 0.0000033

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
Mute : Per channel touch button for MUTE control and tri-color LED for indication
Power : Touch button for ON/STANDBY control and tri-color LED for power state indication
Select : 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 : Yes
Power factor correction : > 0.98 for mains power > 300 W
Regulated switch mode power supply (R.SMPS) : Yes
Breaker Emulation Limiter (BEL) : No
BEL max current threshold : Fixed 8 A
Power Average Limiter (PAL) : Yes
Under Voltage Limiter (UVL) : Yes
Mains undervoltage and overvoltage protection and mains glitch tolerance : Yes


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


Weight : 7.9 kg (17.3 lbs)


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