Lab Gruppen E 40:4 4,000 Watt Amplifier with 4 Flexible Output Channels for Installation Applications

Product Overview

The Lab Gruppen E 40:4 is a 4,000-watt, 4-channel installation amplifier designed for demanding commercial AV deployments where high output density and operational efficiency are required in a single rack unit. Purpose-built for AV integrators specifying distributed audio systems, large conference environments, and multi-zone commercial spaces, the E 40:4 delivers 4 x 1,000 W into 4 ohms across independently configurable Lo-Z and Hi-Z outputs. Its Energy Star certification and IDEEA Class-D architecture make it a strong choice for facilities teams prioritizing long-term operating cost alongside performance.

Product Description

The E 40:4 is the flagship 4-channel model in Lab Gruppen's E Series commercial installation amplifier line. Each of the four output channels can be independently configured for Lo-Z operation at 2, 4, 8, or 16 ohms, or for Hi-Z constant-voltage distribution at 70 V or 100 V — without any additional transformer or external hardware. This per-channel flexibility means a single unit can simultaneously drive low-impedance loudspeakers in a boardroom, 70 V ceiling speakers in an adjacent corridor, and additional zones as required by the system design.

Power allocation across channels is asymmetric by design. The Rail Sense Limiter (RSL) technology dynamically monitors output rail voltages and adjusts limiting per channel to match instantaneous load conditions, reducing clipping and protecting connected loudspeakers in mixed-load configurations. The IDEEA output stage achieves greater than 80% operating efficiency, which translates directly to lower mains current draw, reduced cooling demands, and lower heat output in the rack — all relevant considerations for system designers working within building electrical and HVAC constraints.

A built-in 50 Hz high-pass filter is switchable per channel from the rear panel, along with per-channel level attenuation trimmers and signal-present LEDs that simplify field commissioning without requiring external test equipment. The front panel provides overall power and temperature status LEDs, while a GPIO connector supports contact-closure integration with building management systems or AMX/Crestron control infrastructure for remote power state monitoring and control.

Key Features

• 4,000 W Total Output, 4 Channels — Delivers 4 x 900 W into 2Ω, 4 x 1,000 W into 4Ω or 8Ω, 4 x 625 W into 16Ω, and 4 x 1,000 W into 70 V or 100 V Hi-Z.
• Per-Channel Lo-Z / Hi-Z Configuration — Each channel independently set for low-impedance (2–16Ω) or constant-voltage (70 V / 100 V) operation via rear-panel switch.
• IDEEA Class-D Output Stage — Lab Gruppen's IntelliDrive Energy Efficient Amplifier technology delivers high output with minimal mains current draw and reduced heat generation.
• Energy Star Certified — Standby consumption below 2.5 W with auto-standby and auto-power-on after 20 minutes of no input signal.
• Rail Sense Limiter (RSL) — Proprietary limiter monitors rail voltages per channel to reduce clipping and optimize output under asymmetric or mixed-impedance loads.
• Asymmetric Channel Loading — Total output power can be allocated unequally across channels, allowing one channel to carry a heavier load while others handle lighter zones.
• Built-In 50 Hz High-Pass Filter — Switchable per channel from rear panel; protects subwoofer-excluded speakers in distributed systems.
• GPIO Integration — Contact-closure GPI/GPO connector for third-party control system power state management.
• 1RU Form Factor — 44 x 483 x 417 mm (1.7 x 19 x 16.4"), 7.9 kg; maximizes rack density in multi-amplifier installations.
• Universal Mains Input — 100–240 VAC via standard IEC receptacle; no voltage switching required.

Typical Applications

• Boardroom and executive conference room audio
• Large conference room and multi-zone meeting spaces
• House of worship distributed speaker systems
• Government and municipal AV installations
• All-hands and town hall auditorium systems
• Training room and multi-purpose room audio
• Commercial building background music and paging

Technical Specifications

Frequently Asked Questions

Q: Can each channel be independently set for 70 V or Lo-Z operation?

A: Yes. Each of the four channels has its own rear-panel RSL switch that independently selects Lo-Z (2–16Ω) or Hi-Z (70 V / 100 V) mode, so a single E 40:4 can simultaneously drive mixed loads across different zones.

Q: Does the E 40:4 support 100 V distributed systems?

A: Yes. All four channels support both 70 V and 100 V constant-voltage operation, making it suitable for European-standard 100 V distributed audio systems as well as North American 70 V installations.

Q: What is asymmetric channel loading and when is it useful?

A: Asymmetric loading allows the total 4,000 W output to be distributed unequally across channels — for example, one channel can carry a heavier load (such as a subwoofer zone) while another handles a lighter load (such as a small meeting room). This maximizes utilization of the amplifier's total headroom.

Q: How is the E 40:4 integrated with a building control system?

A: The GPIO connector on the rear panel provides contact-closure GPI (power control input) and GPO (power state output) terminals. These allow Crestron, AMX, or other control systems to remotely switch the amplifier between standby and on, and to monitor its power state.

Q: What certifications does the E 40:4 carry?

A: The E 40:4 is Energy Star certified, reflecting its operating efficiency above 80% and standby consumption below 2.5 W. It also carries CE approval and is designed and engineered in Sweden.

Q: Does the E 40:4 require active cooling infrastructure in the rack?

A: The amplifier uses a temperature-controlled fan with front-to-back airflow. Its high Class-D efficiency significantly reduces heat output compared to Class-AB designs of similar power, reducing but not eliminating rack ventilation requirements.

Q: What connectors are used for inputs and outputs?

A: Inputs use 3-pin detachable screw terminals (electronically balanced) and outputs use 2-pin detachable screw terminals — both standard for commercial installation applications.