Lab Gruppen D 120:4L - 3000W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Lake DSP and Dante Audio Networking in Black Finish

The Lab Gruppen D 120:4L is a high-performance 3000W, 4-channel power amplifier designed for demanding sound installations in large venues such as stadiums, arenas, convention centers, and other critical audio environments. Part of Lab Gruppen's D Series, this amplifier incorporates advanced technologies that provide exceptional sound quality, flexibility, and power management for commercial audio systems. With a robust output stage and cutting-edge features such as Rational Power Management (RPM) and Lake DSP, the D 120:4L is ideal for high-output, complex installations where system control and energy efficiency are paramount.

At the core of the D 120:4L is Lab Gruppen's innovative Rational Power Management (RPM) technology. RPM allows for total flexibility in power allocation across all 4 channels, ensuring efficient use of available power. The amplifier is capable of delivering 3,000W per channel into 2Ω and 4Ω loads, and even supports 70V and 100V high-impedance loudspeaker configurations, making it perfect for a variety of system designs. Whether it's a large-scale distributed audio system or a mission-critical sound reinforcement application, the D 120:4L can handle high power demands with ease, while providing high efficiency and low distortion.

Designed with system integration in mind, the D 120:4L integrates Lake Processing, offering powerful loudspeaker management and system control capabilities. This includes crossovers, equalization, delay, and LimiterMax (peak and RMS limiters). With up to 4 modules of linear-phase/FIR filtering, it ensures optimal sound quality across various types of loudspeakers and system configurations. This is complemented by the inclusion of 8x8 channels of dual-redundant Dante digital audio networking, supporting AES67 for enhanced compatibility with third-party systems. The amplifier also supports integration with matrix systems like MediaMatrix and Q-Sys via dedicated interfacing software.

The amplifier's efficient Class-TD output stage, coupled with a high-efficiency cooling system known as Intercooler, ensures that the unit can handle extended operation periods without the risk of overheating. With advanced protection mechanisms, including temperature regulation, short-circuit protection, and current-limiting features, the D 120:4L is designed for maximum reliability, especially in large, high-demand installations. Its built-in surveillance and load monitoring features provide real-time diagnostics, making it ideal for voice alarm systems that require consistent performance and compliance with mission-critical regulations.

For ease of use, the D 120:4L includes a comprehensive front-panel user interface with tri-color LEDs to indicate system status, channel status, and fault detection. Each of the 4 channels has dedicated mute buttons with visual indicators for clear feedback. Additionally, the amplifier is equipped with Neutrik etherCON RJ45 ports for Dante and Lake Controller connectivity, enabling easy remote monitoring and control through Dante Controller and Lake Controller software. The detachable grille and rear support brackets ensure quick and simple maintenance, while the compact 2U rackmount chassis facilitates straightforward installation in various setups.

The D 120:4L's high level of configurability makes it adaptable to a wide range of applications. With its wide range of power output capabilities, from 2Ω to 100V configurations, and multiple redundancy options, the amplifier can be tailored to meet the unique needs of any installation. Whether you're powering large speaker arrays in a stadium or managing a distributed audio system across multiple zones, the D 120:4L provides the flexibility, power, and reliability required for demanding environments.

Features

• 4-channel power amplifier delivering 3,000W per channel at 2Ω and 4Ω, and up to 1,900W at 8Ω, with support for 70V/100V configurations
• Lake Processing for powerful loudspeaker management, including crossovers, EQ, delay, and LimiterMax
• 8x8 channels of dual-redundant Dante digital audio networking with AES67 support for seamless integration
• Class-TD output stage with Intercooler cooling system for maximum efficiency and thermal performance
• Rational Power Management (RPM) for flexible power allocation across all channels, optimizing system efficiency
• Built-in surveillance and load monitoring features, ideal for mass notification and voice alarm systems
• Comprehensive protection features including short-circuit, temperature, and current-limiting protection
• Real-time system diagnostics and monitoring through Lake Controller and Dante Controller software
• High-quality analog and digital inputs, including 4 analog inputs with Iso-Float ground isolation and AES/EBU digital inputs
• Flexible audio system integration with third-party matrix systems like MediaMatrix and Q-Sys
• 2U rackmount chassis with front-to-rear airflow and rear support brackets for easy installation and maintenance
• Power Factor Correction (PFC) for improved efficiency and reduced operating costs
• Detachable Neutrik powerCON cable rated at 250V/32A for reliable power connection
• Dimensions: 19 x 3.5 x 16 inches; weight: 35 lbs
• Approvals: CE, ETL, PSE, RCM, BIS, CCC certified

Specifications

General

• Processing / Network: Lake / Dante
• Number of amplifier channels: 4
• Total burst power all channels (share among channels with RPM): 12000 W

Maximum Output Power (all channels driven)

• 2 ohms: 3300 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

Maximum Output Power Bridged Mode (all channels driven) 

• 4 ohms: 6000 W
• 8 ohms: 6000 W
• 16 ohms: 3800 W

Maximum Output Power Single Channel (all models)

• 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): Yes
• 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
• Amplifier gain: Digital configurable amplifier gain 22 - 44 dB
• Pilot tone generation and analysis: Yes
• Load impedance analysis: Yes
• Temperature control: Regulated fans and show must go on limitation (ATL, PTL)

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 ohms, 20 Hz - 20 kHz): +/- 0.05 dB
• 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 EQ 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 (shared with AES67)
• Network topology / redundancy: Flexible topology / Supports daisy-chained and Dual redundant networks
• Sample rates / transport: 48, 96 kHz / Unit / Multicast
• Network latency: 0.25, 0.5, 1.0, 2.0, 5.0 ms

AES67 Audio Network

• I/O: 8x8 (shared with Dante)
• Network topology / redundancy: Flexible topology / supports daisy-chained networks
• Sample rates / transport: 48 kHz / Multicast
• Network latency: 2 ms

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 kΩ / 10 kΩ
• THD + N (typical at 1 kHz unweighted): 0.000022%
• THD + N (typical at 20 Hz and 20 kHz unweighted): 0.000033%

AES Inputs

• Inputs: 2 AES inputs (4 audio channels)
• Supported sample rates / resolution: 44.1, 48, 88.2, 96, 176.4, 192 kHz / up to 24 bit
• Sample rate conversion THD + N 20 Hz - 20 kHz unweighted: 0.00003%

Rear Panel Interface

• Analog inputs: 4 x Terminal block connectors along input with +, - and ground
• AES inputs: 2 x Terminal block connectors
• 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 10/1000 Base-T for the Lake Controller, Dante controller and/or DLM (3rd party protocol)
• Detachable mains cord: Neutrik PowerCon rated at 250 V / 32 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 bi-directional device software select functionality

Mains Power

• Nominal voltage: 100 - 240 V 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 (D120:4 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-80P 125V / 30A (Japan)

Power Supply Features

• Soft start / Inrush power: Yes / Max 8 A
• Power factor correction: > 0.98 for mains power > 300 W
• Regulated switch mode power supply (R.SMPS): Yes
• Breaker Emulation Limiter (BEL): Configurable current threshold and breaker profile
• BEL max current threshold: 25 A
• Power Average Limiter (PAL): Yes
• Under Voltage Limiter (UVL): Yes
• Mains undervoltage and overvoltage protection and mains glitch tolerance: Yes

Physical

• Dimensions:
  • Rack rail to rear panel (WHD): 19 x 3.50 x 16 inches
  • Overall all depth front-rear support: 18.22 inches
• Weight: 35 lbs
• Finish: Black painted steel chassis with grey painted steel front with detachable grille
• Approvals: CE, ETL (ANSI/UL, CSA), PSE, RCM, BIS, CCC