LAB GRUPPEN D 120:4L_US4 12,000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing and Digital Audio Networking for Installation Applications (D 120:4L_US4)

Vendor: Lab Gruppen
LAB GRUPPEN D 120:4L_US4 12,000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing, and Digital Audio Networking for Installation Applications The D 120:4L isn't just a power amplifier; it's a dynamic force...

LAB GRUPPEN D 120:4L_US4 12,000W Amplifier with 4 Flexible Output-Channels, Lake Digital Signal Processing, and Digital Audio Networking for Installation Applications

The D 120:4L isn't just a power amplifier; it's a dynamic force transforming sound experiences. Boasting an impressive 12,000 W of flexible power, this amplifier merges cutting-edge Lake DSP, DANTE digital audio networking, and advanced system integrity monitoring.

Legendary Technology and Power

Rooted in the legacy of Lab Gruppen's renowned PLM Series, known for delivering unmatched reliability and sonic prowess in the most demanding settings worldwide, the D 120:4L sets a new standard for digitally networked sound installations. Its robust core technologies, fine-tuned and optimized, redefine excellence in stadiums, arenas, theme parks, performing arts centers, racecourses, and vast commercial sound setups. Beyond its legendary reliability and acoustic brilliance, the D Series introduces refined output stage technologies and installation-specific hardware and software features. These innovations streamline amplifier system design and configuration, empowering integrators to slash initial equipment costs and minimize long-term energy consumption for end-users.

Rational Power Management (RPM)

The D Series platform's cornerstone is Rational Power Management (RPM), Lab Gruppen's exclusive technology empowering system designers and integrators with unparalleled control over output power allocation on individual channels. This ensures peak performance tailored to specific load demands. Unlike conventional amplifiers that often require "over-specification" to meet maximum power requirements, resulting in wasted capacity across channels, RPM revolutionizes this by efficiently redistributing power among the four channels. For instance, the D 120:4L, a star of the D Series, showcases this capability by allowing two channels to deliver a robust 5000 W each. This smart allocation optimizes available power, leaving any remaining capacity to be assigned to other channels handling less demanding loads. RPM not only enhances performance but also minimizes initial equipment costs and reduces rack space needs, a testament to its efficiency and versatility.

CAFE for Green Credentials

The D 120:4T boasts compatibility with the cutting-edge CAFE (Configuring Amplifiers For the Environment) software suite, allowing versatile configuration and monitoring capabilities. Beyond comprehensive system surveillance and RPM feature customization, CAFE introduces an innovative tool known as the Equipment Specification Predictor (ESP). ESP serves as a design aid by meticulously evaluating system and load prerequisites, subsequently offering precise recommendations for the installation. This includes suggested D Series unit models and quantities, anticipated heat generation, channel distribution, and current draw, facilitating accurate mains management. Additionally, ESP aids in the precise specification of cooling systems and UPS as needed, ensuring optimal performance tailored to the installation's specific requirements.

The Power of Lake Processing

The D Series Lake versions offer unparalleled input adaptability, harnessing the exclusive power of Lake processing algorithms for exceptional audio control and monitoring through the Lake Controller. Seamlessly integrating into Dante digital audio networks, these versions also support integration into other widely used networked digital matrix systems via third-party middleware. Each D Series Lake model features four comprehensive Lake Processing modules, ensuring four discrete channels of audio throughput from input to output. With selectable audio signals from analog, AES3 digital, and Dante networked digital inputs, individual channel input signals can be customized, even programmable failing over to analog when necessary. The onboard Lake processor boasts extensive functionalities, including group control with Raised Cosine™ MESA EQ™ asymmetric filters designed to match various loudspeaker system responses. Moreover, its LimiterMax™ peak and RMS limiters set industry standards for safeguarding loudspeakers while preserving sonic clarity.

Rational Power Management

RPM allows truly flexible allocation of the 12000 W of available power across all 4 channels of the D 120:4 to ensure the most efficient and rational use of amplifier inventory. With up to 2 channels capable of up to 5000 W without bridging (losing channel count), leaving remaining power to be allocated across other channels as required, D 120:4 is capable of meeting the demands of even power-hungry performance install applications

Lake Processing with DANTE

The robust power platform of D Series works hand-in-glove with dual integrated Lake Processing modules. Lake features such as Raised Cosine Equalization™, Limiter Max™ peak and RMS limiters, and Iso-Float™ ground isolation. AES3 digital and dual-redundant Dante networked inputs are standard for compliance in mission-critical PA/VA applications.

Real World Green Credentials

The integration of distinct power supply technologies, delivering exceptional and consistent low current draw to power output, alongside the innovative CAFE software, revolutionizes mains management. This results in significant cost savings on crucial infrastructure like cooling and UPS systems, effectively reducing both initial installation expenses and ongoing operational costs for venue audio systems.


  • 12,000 Watt amplifier with 4 flexible output channels and up to 5,900 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 3,000 Watts into 2 Ohms, 4 x 3,000 Watts into 4 Ohms, 4 x 1,900 Watts into 8 Ohms, 4 x 950 Watts into 16 Ohms, 4 x 3,000 Watts into Hi-Z 70 V, 4 x 3,000 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 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 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 Neutrik powerCON cable rated at 250 V / 32 A with variety of wall plugs selectable on order

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

  • Rugged 2U 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)

12000 W

Max output power (all channels driven)1
2 ohms

3000 W

2.67 ohms

3000 W

4 ohms

3000 W

8 ohms

1900 W

16 ohms

950 W

Hi-Z 70 V

3000 W

Hi-Z 100 V

3000 W

Max output power single channel (all models)1
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 (1 channel on D 80:4, 2 channels on D 120:4)

Default voltage limitation (can be lifted with RPM configuration)

175 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

Amplifier platform
Inter Sample Voltage Peak Limiter (ISVPL)

Configurable Peak voltage threshold and profile

THD + N at 1 kHz and 1 dB below clipping

< 0.04 %

Pilot tone generation and analysis


Load impedance analysis


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

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

2 AES inputs (4 audio channels)

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 / 76 A (exceeding amplifier capacity) Can take up to 16 mm2 (6 AWG) cables

Ethernet Ports

2 x EtherCon RJ45 100/1000 Base-T for the Lake Controller, Dante controller and/or DLM (3rd party protocol)

Detachable mains cord

Neutrik PowerCon rated at 250V/32A

Front-panel user interface
System status indication

3 x 3 colored LED. FRAME, TEMP, PSU for device status indication

Channel status indication

3 x 3 colored LED per channel. Status indication separated for channel LOAD, AMP, SIGNAL status


Per channel touch button for mute control and bicolored LED for indication


Touch button for ON/STANDBY control and bicolored 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 L5-30 “Twistlock” 125 V / 30 A NEMA 5-15P 125 V / 15 A (D 80:4 only) NEMA 5-20P 125 V / 20 A (D 120:4 only) NEMA 6-20P 250 V / 20 A AS/NZS 3112 230 V / 15 A (Aus/Nz) BS 546 230 V / 16 A (India) C-30P 125 V / 30 A (Japan)

Power supply features
Soft start / Inrush power

Yes/ Max 8 Ampere

Power factor correction

> 0.98 for mains power > 400 W

Regulated switch mode power supply (R.SMPS)


Breaker Emulation Limiter (BEL)

Configurable current threshold and breaker profile

BEL max current threshold

25 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: 463 mm


15.8 kg (35 lbs)


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