Lab Gruppen E 5:4 - 125W 4-Channel at 4-Ohm 70V/100V Power Amplifier with Screw Terminal Inputs/Outputs and Energy Star Certification in Dark Gray Finish

The Lab Gruppen E 40:4 is a highly efficient, powerful amplifier designed to meet the demanding needs of professional audio installations while maintaining impressive energy savings and operational flexibility. As part of Lab Gruppen's E Series, the E 40:4 combines superior performance, compact design, and energy-saving technologies, making it the ideal solution for installations that require high power output and long-term reliability. This 4-channel amplifier delivers a total output of 4000W, with 1000W per channel, and offers excellent performance across a wide range of speaker loads, including low impedance and constant voltage systems. With advanced features such as the IntelliDrive Energy Efficient Amplifier (IDEEA) technology, the E 40:4 sets a new standard for efficiency and sustainability in high-performance audio systems.

At the heart of the E 40:4 is Lab Gruppen's proprietary IDEEA platform, which uses a patented Class D output stage to produce high power levels while maintaining low distortion. This efficient design ensures that the amplifier consumes minimal mains current and generates minimal heat, thus reducing demands on the installation's mains distribution and cooling systems. The E 40:4 also features Rail Sensing Limiter (RSL) technology, which optimizes the output power by adjusting the amplifier's response to varying load conditions. This helps reduce signal clipping, ensuring high-quality audio output across a wide range of connected speakers, including both low impedance and constant voltage loads. The RSL system also enables asymmetric loading, allowing the amplifier to deliver more power to one channel while sending less to another, thus optimizing overall system efficiency.

The E 40:4 provides remarkable flexibility, offering output power for both low impedance (2, 4, 8, and 16 ohms) and constant voltage (70V/100V) systems. It delivers up to 1000W per channel at 4 ohms, and can drive higher power loads in single-channel configurations. For example, when configured for 70V or 100V, the amplifier can deliver up to 2000W per channel, making it ideal for both distributed ceiling loudspeakers and subwoofer applications. The amplifier's output configuration flexibility enables users to mix and match different loads to suit the needs of the installation, enhancing efficiency and minimizing inventory requirements.

The E 40:4 is fully compliant with Energy Star certification, ensuring that it meets stringent energy efficiency standards while also delivering impressive power. The amplifier's net operating efficiency is greater than 80%, which, combined with its auto-power-down feature, allows it to consume less than 2.5W when not in use. This ensures significant energy savings over the long term, while the amplifier automatically resumes operation when it detects an input signal. The unit also offers a wide range of connectivity options, including detachable screw terminals for both inputs and outputs, as well as a GPIO connector for external control and monitoring of power status.

Other notable features of the E 40:4 include a 50Hz high-pass filter (selectable per channel), rear panel signal LEDs for easy commissioning, and a front-to-rear cooling system with temperature-controlled fans that ensure efficient operation even during extended use. The E 40:4 is housed in a rugged, 1U rackmount chassis that is designed for easy integration into any professional audio system. With its superior build quality, flexible power options, and energy-efficient design, the E 40:4 is the perfect choice for large-scale installations where high power, low running costs, and long-term reliability are critical.

Features

• 4000W total output with 4 channels, up to 1000W per channel at 4 ohms, and 2000W per channel at 70V/100V
• Lab Gruppen's IntelliDrive Energy Efficient Amplifier (IDEEA) technology for high performance and low power consumption
• Rail Sensing Limiter (RSL) to optimize output and reduce signal clipping across varying load conditions
• Energy Star certified with net operating efficiency greater than 80% and auto-power-down feature for energy savings
• Asymmetric channel loading to maximize system efficiency and reduce inventory requirements
• Flexible output options for both low impedance (2, 4, 8, 16 ohms) and constant voltage (70V/100V) systems
• Built-in 50Hz high-pass filter, switchable per channel, for speaker protection
• Rear panel attenuation knobs and signal LEDs for easy setup and monitoring
• Efficient cooling with temperature-controlled fans and front-to-rear airflow
• Dimensions: 1.7 x 19 x 16.4 inches
• Weight: 17.8 lbs
• Finish: Dark grey aluminum front and black steel chassis

Specifications

General

• Number of powered channels: 4
• Total output all channels driven: 500 W
• Max output voltage per channel: 100 Vp / 70 Vrms
• Max output current per channel: 10 Arms
• Asymmetric load operation: Units are capable of delivering extra power to one channel while sending significantly less to the other. See "single ch. max" below the "all channels driven"

Sensitivity and Maximum Output Power (all channels driven)

• 2 Ω load: N/R
• 4 Ω load: 1 dBu: 125 W @ Lo-Z mode
• 8 Ω load: 4 dBu: 125 W @ Lo-Z mode
• 16 Ω load: 4 dBu: 63 W @ Lo-Z mode / 0 dBu: 125 W @ 70 V mode
• 70 V load: 4 dBu: 125 W @ 70 V mode
• 100 V load: 4 dBu: 125 W @ 70 V mode into 100 V load tapped @ 250 W

Sensitivity and Maximum Output Power (single channel max)

• 2 Ω load: N/R
• 4 Ω load: 4 dBu: 250 W @ Lo-Z mode / -1 dBu: 400 W @ 70 V mode
• 8 Ω load: 4 dBu: 125 W @ Lo-Z mode / 3 dBu: 500 W @ 70 V mode
• 16 Ω load: 4 dBu: 63 W @ Lo-Z mode / 4 dBu: 310 W @ 70 V mode
• 70 V load: 4 dBu: 500 W @ 70 V mode
• 100 V load: 4 dBu: 500 W @ 70 V mode into 100 V load tapped @ 1000 W

Performance

• THD (20 Hz - 20 kHz @ 1 W into 8 Ω): <0.1%
• THD @ 1 kHz, 1 dB below clipping: <0.05%
• Signal-to-noise ratio: >106 dBA
• Channel separation (crosstalk) @ 1 kHz: >70 dB
• Frequency response: 2 Hz - 40 kHz
• Input impedance: 20 kΩ
• Input common mode rejection, CMR: 50 dB
• Output impedance: 25 mΩ

Limiters and Gain

• LIMIT switch (per channel): 2 positions: 70 V and Lo-Z
• Max output voltage, LIMIT switch pos A (70 V): 100 Vp / 70 Vrms
• Max output voltage, LIMIT switch pos B: N/A
• Max output voltage, LIMIT switch pos C (Lo-Z): 45 Vp / 32 Vrms
• Gain in LIMIT switch pos A (70 V): 35.2 dB
• Gain in LIMIT switch pos B: N/A
• Gain in LIMIT switch pos C (Lo-Z): 28.2 dB
• Level adjustment (per channel): Rear panel potentiometer, detented from -∞ to 0 dB

Connectors and Switches

• Input connectors (per channel): 3-pin detachable screw terminals, electronically balanced
• Output connectors (per channel): 2-pin detachable screw terminals
• High pass filter: Fixed at 50 Hz, switchable per channel
• Power control: Can be used to go between standby and ON, unit will also enter standby automatically after 20 min of inactivity and resume when signal is present
• GPI (power control input): Contact closure type, 2-pin detachable screw terminal, controls the power state
• GPO (power state output): Contact closure type, 2-pin detachable screw terminal, for external monitoring of the power state
• Cooling: Two fans, front to rear airflow, temperature controlled speed

Power

• Nominal voltage: 100 - 240 VAC
• Power consumption: 160 W
• Standby consumption: <1 W
• Mains connector: Standard IEC receptacle

Physical

• Dimensions (HWD): 1.7 x 19 x 15 inches
• Weight: 14.1 lbs
• Finish: Dark grey aluminium front and black steel chassis