Lab Gruppen D 40:4L - 1000W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Lake DSP and Dante Audio Networking in Black Finish

The Lab Gruppen D 40:4L is a high-performance, 1000W, 4-channel power amplifier designed to meet the needs of large-scale and demanding audio installations. Building upon the proven technologies of the Lab Gruppen D Series, this amplifier is ideal for integration into high-capacity venues such as stadia, convention centers, arenas, and other large commercial installations. It combines exceptional audio performance with efficient power management and advanced network integration, making it a versatile solution for any complex audio system.

At the heart of the D 40:4L lies the innovative Lake DSP (Digital Signal Processing), which provides powerful loudspeaker management tools. The onboard DSP allows for precise control of crossovers, equalization, delay, and LimiterMax peak and RMS limiters, ensuring that audio is optimized for both loudspeaker performance and room acoustics. This allows system integrators to deliver unmatched sound quality, with the flexibility to fine-tune the system for any application, from background music to full-range live sound reproduction.

The D 40:4L is equipped with 8x8 channels of dual-redundant Dante digital audio networking, which integrates seamlessly into modern digital audio networks. Dante provides low-latency, high-quality audio transport over standard IP networks, offering great flexibility in large installations. The amplifier also supports AES67, ensuring compatibility with a wide range of third-party systems. This makes the D 40:4L ideal for use in large venues where scalability, reliability, and flexibility are key considerations.

With a flexible output design, the D 40:4L delivers up to 1000W per channel into 2.67Ω, 4Ω, and 8Ω loads, and is capable of powering both low-impedance and high-impedance systems (such as 70V/100V), making it suitable for a wide range of speaker configurations. The amplifier features a Class D output stage, offering high efficiency with low heat output. It also incorporates Lab Gruppen's Rational Power Management (RPM), a technology that allows for optimal allocation of power across all four channels. This ensures that each channel operates efficiently, even in complex audio systems, potentially reducing the need for additional amplifiers and simplifying system design.

The D 40:4L's advanced protection features, such as current average limiter (CAL), very high-frequency protection (VHF), short-circuit protection, and temperature monitoring, ensure reliable operation in demanding environments. The amplifier also includes a Breaker Emulation Limiter (BEL), which safeguards against mains breaker tripping by controlling the current draw. Adaptive Rail Control helps maximize energy efficiency at lower output levels, while Under-Voltage Limiting (UVL) ensures continued operation during mains voltage drops, making the D 40:4L a dependable choice for mission-critical installations.

For system monitoring and control, the D 40:4L is compatible with Lab Gruppen's CAFe software, which allows for easy equipment specification, commissioning, and ongoing system monitoring. This software provides an intuitive interface for configuring the amplifier's settings and integrating it into larger systems. The amplifier's front panel includes tri-color LEDs to indicate system status, channel status, and mute status, along with touch buttons for mute control and power on/off. The front panel also features dedicated channels for adjusting gain and selecting functions, offering full control over the amplifier's operation.

The D 40:4L is built to last, with a rugged 1U rackmount chassis designed for ease of installation in standard racks. The amplifier features a detachable powerCON cable and a removable dust filter grille for easy maintenance and improved airflow. The unit is engineered with high reliability in mind, meeting international standards and certifications such as CE, ETL (ANSI/UL, CSA), PSE, RCM, BIS, and CCC.

Features

• 4-channel amplifier delivering up to 1000W per channel with support for 2Ω, 2.67Ω, 4Ω, 8Ω, 16Ω, 70V/100V speaker configurations
• Lake DSP for advanced loudspeaker management with crossovers, EQ, delay, and LimiterMax peak and RMS limiters
• Dual-redundant Dante digital audio networking with AES67 support for seamless integration into modern IP-based audio systems
• Rational Power Management (RPM) optimizes power allocation across all channels, reducing amplifier inventory
• Class D output stage for high efficiency and low heat generation
• Best-in-class Power Factor Correction (PFC) reduces energy costs and environmental impact
• Breaker Emulation Limiter (BEL) and Under-Voltage Limiting (UVL) ensure reliable operation and protection
• Redundant audio inputs and load monitoring for voice alarm and mass notification systems
• 4 analog inputs with Iso-Float ground isolation and 4 AES/EBU digital inputs supporting up to 192 kHz, 24-bit resolution
• Detachable Neutrik powerCON cable for reliable power delivery
• Rugged 1U rackmount chassis with rear support brackets for ease of installation
• Dimensions: 19 x 1.75 x 16.7 inches; weight: 18.3 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): 4000 W

Maximum Output Power (all channels driven)

• 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

Maximum Output Power Single Channel (all models)

• 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): Yes
• 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
• 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: 15 A
• Power Average Limiter (PAL): Yes
• Under Voltage Limiter (UVL): Yes
• 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: 18.3 lbs
• Finish: Black painted steel chassis with grey painted steel front with detachable grille
• Approvals: CE, ETL (ANSI/UL, CSA), PSE, RCM, BIS, CCC