Lab Gruppen D 20:4L - 500W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Lake DSP and Dante Audio Networking in Black Finish

The Lab Gruppen D 20:4L is a 500W, 4-channel power amplifier designed for large-scale commercial installations where high performance, reliability, and efficiency are paramount. Part of Lab Gruppen's D Series, this amplifier is engineered to provide superior sound quality, flexibility, and system control in complex sound reinforcement applications such as stadiums, arenas, convention centers, and other large venues. Built upon Lab Gruppen's renowned amplifier technologies, the D 20:4L integrates state-of-the-art features like Lake DSP processing and Dante audio networking, making it a versatile solution for modern audio systems that demand performance and ease of integration.

Featuring Lake digital signal processing, the D 20:4L offers unparalleled loudspeaker management, providing users with essential tools like crossovers, equalization, delay, and LimiterMax peak and RMS limiters. This powerful DSP suite ensures precise control over the sound system, optimizing the output for any environment and enhancing system longevity. The amplifier is also equipped with Rational Power Management (RPM), a proprietary Lab Gruppen technology that optimizes power allocation across all channels for maximum efficiency. With RPM, the amplifier dynamically adjusts its power distribution, reducing energy consumption while ensuring adequate power is available for each channel as needed. This flexibility makes the D 20:4L ideal for both low-impedance (2Ω-16Ω) and high-impedance (70V/100V) systems.

The D 20:4L's flexibility is further enhanced by its integrated 8x8 channels of dual-redundant Dante digital audio networking with AES67 support, enabling seamless integration with a wide variety of networked audio systems. The amplifier supports all standard sample rates up to 192 kHz with 24-bit resolution, ensuring pristine audio quality and reliable distribution across large networks. Whether used in a daisy-chained setup or a fully redundant network, the D 20:4L offers fault tolerance and optimal performance, ensuring uninterrupted audio delivery even in mission-critical applications.

In addition to Dante and AES/EBU digital audio, the D 20:4L features four high-quality analog inputs with Iso-Float ground isolation, providing reliable audio distribution without interference. This versatility allows the amplifier to accommodate both analog and digital sources, making it ideal for a range of setups where both types of audio signals are used. For users seeking full control, the amplifier includes integration with third-party matrix systems like MediaMatrix and Q-Sys, and all configuration and monitoring can be performed via Lab Gruppen's CAFe software, which simplifies system planning, installation, and ongoing management.

Designed for efficient operation, the D 20:4L incorporates Lab Gruppen's best-in-class Power Factor Correction (PFC) and a switch-mode power supply (SMPS) to minimize environmental impact and reduce running costs. With the Breaker Emulation Limiter (BEL) feature, the amplifier can prevent tripping of mains breakers by monitoring and adjusting the amplifier's current draw to stay within safe limits. Adaptive Rail Control further improves energy efficiency at lower output levels, contributing to real-world lifetime savings. The D 20:4L also features Under-Voltage Limiting (UVL), ensuring continued operation during significant mains supply voltage drops, making it a highly reliable solution for large installations.

With its compact 2U form factor, the D 20:4L can be easily installed in standard rackmount setups, and it comes equipped with a detachable dust filter grille for improved airflow and simple maintenance. The amplifier's rear panel features Phoenix connectors for balanced analog and digital audio inputs, as well as two Neutrik etherCON RJ45 ports for Dante and Lake Controller connectivity. The front panel includes tri-color LEDs for system and channel status indication, as well as dedicated mute buttons for each channel. The user-friendly interface and robust set of features make the D 20:4L an ideal choice for large, high-performance audio installations.

Features

• 4-channel power amplifier delivering 500W per channel at 4Ω, with support for 2Ω-16Ω and 70V/100V systems
• Lake digital signal processing for loudspeaker management, including EQ, crossovers, delay, and LimiterMax
• 8x8 dual-redundant Dante audio networking with AES67 support for seamless integration with networked systems
• Integrated Rational Power Management (RPM) for optimized power allocation and energy efficiency
• Best-in-class Power Factor Correction (PFC) and switch-mode power supply for reduced running costs and environmental impact
• Breaker Emulation Limiter (BEL) to safeguard mains breakers and prevent overloads
• Under-Voltage Limiting (UVL) for continued operation during mains voltage drops
• Flexible input options: 4 analog inputs with Iso-Float ground isolation, AES/EBU digital inputs
• Supports third-party matrix systems such as MediaMatrix and Q-Sys via dedicated interfacing software
• Comprehensive protection features including current-limiting, short-circuit, temperature, and voltage protection
• Easy integration and monitoring via Dante Controller and Lake Controller software
• 2U rackmount chassis with detachable grille for improved airflow and maintenance
• Dimensions: 19 x 1.75 x 16.7 inches; weight: 17.3 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): 2000 W

Maximum Output Power (all channels driven)

• 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

Maximum Output Power Single Channel (all models)

• 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): Yes
• 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
• Pilot tone generation and analysis: Yes
• Load impedance analysis: Yes
• Temperature control: Temperature regulated fans (front-to-rear airflow) 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: > 112 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
• Network topology / redundancy: Flexible topology / Supports Dual redundant networks
• Sample rates / transport: 48, 96 kHz / Unit / Multicast
• Network latency: 0.25, 0.5, 1.0, 2.0, 5.0 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: 4 AES inputs
• 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%

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 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 5-15 125 V / 15 A, BS1363-A 250 V / 13 A, 1A16A3 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): Configurable mains current threshold and breaker profile (profile only D 40)
• BEL max current threshold: 7 A
• Power Average Limiter (PAL): Yes
• Under Voltage Limiter (UVL): No
• Mains undervoltage and overvoltage protection and mains glitch tolerance: Yes
• Adaptive Rail Control: Optional green mode for improved efficiency at low output levels

Physical

• Dimensions:
  • Rack rail to rear panel (WHD): 19 x 1.75 x 16.7 inches
  • Overall depth front-rear support: 18.22 inches
• Weight: 17.3 lbs
• Finish: Black painted steel chassis with grey painted steel front with detachable grille
• Approvals: CE, ETL (ANSI/UL, CSA), PSE, RCM, BIS, CCC