Lab Gruppen E 4:2 - 200W 2-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 4:2 is a compact yet powerful 2-channel power amplifier designed to deliver high-quality audio performance with energy efficiency. Ideal for commercial and industrial sound systems, this amplifier brings Lab Gruppen's renowned sonic excellence and reliability to the installation market, combining performance, flexibility, and low operating costs. With a 1U rackmount form factor, the E 4:2 fits into tight spaces while offering impressive power output and operational flexibility, making it a versatile solution for a wide range of applications including commercial audio systems, public address, and distributed audio in venues like conference halls, restaurants, and retail spaces.

At the core of the E 4:2 is Lab Gruppen's IntelliDrive Energy Efficient Amplifier (IDEEA) technology. Built around a patented Class D output stage, IDEEA ensures low distortion and high power output, while drawing minimal current from the mains supply. This makes the E 4:2 highly energy-efficient, reducing running costs and minimizing heat generation. Lab Gruppen's Rail Sensing Limiter (RSL) further enhances the amplifier's performance by dynamically adjusting to load conditions, minimizing signal clipping, and optimizing output for both constant voltage (70V/100V) and low impedance (Lo-Z) configurations. This allows the amplifier to drive different types of loudspeakers - such as ceiling speakers, subwoofers, and full-range systems - simultaneously with minimal loss of efficiency.

The E 4:2's ability to deliver flexible power output is a standout feature. With a maximum output of 200W per channel at 4 Ohms, the amplifier offers great versatility in delivering power to a variety of loudspeakers, whether low impedance or constant voltage. The amplifier also supports asymmetric loading, meaning it can allocate extra power to one channel while sending less to another, optimizing the overall system efficiency. This feature is particularly useful in setups that require different power levels for different types of speakers or zones.

Energy efficiency is at the forefront of the E 4:2's design. The amplifier is Energy Star certified, which means it meets rigorous efficiency standards while maintaining high sonic performance. The amplifier's auto-standby feature further reduces power consumption by automatically switching to standby mode after 20 minutes of inactivity, consuming less than 1W. Upon detecting an input signal, the amplifier powers back on, ensuring seamless operation while reducing unnecessary energy use.

The E 4:2 also includes several features that ensure long-term reliability and ease of use. The amplifier is equipped with comprehensive protection circuits to safeguard against overloads and other potential hazards. These include temperature protection and fail-safe mechanisms, ensuring the amplifier operates smoothly even under challenging conditions. The rear panel offers convenient controls such as per-channel attenuation knobs and signal LEDs, making commissioning and system setup quick and easy. Additionally, the amplifier includes a fixed 35Hz high-pass filter, which can be selected per channel, providing an effective means of protecting the speakers from unwanted low-frequency signals.

For efficient cooling, the E 4:2 is designed with a temperature-controlled fan that operates with front-to-rear airflow, ensuring the amplifier stays cool and quiet. The amplifier's compact size, efficient operation, and reliable performance make it a perfect choice for installations where space is at a premium, but power and flexibility are still critical.

The Lab Gruppen E 4:2 is a powerful, energy-efficient amplifier that combines superior audio performance with flexible configuration options, making it an ideal solution for modern commercial audio installations.

Features

• 200W per channel at 4 Ohms, with 70V/100V constant voltage compatibility for flexible speaker configurations
• Energy Star certified for high energy efficiency and low operating costs
• Lab Gruppen's IntelliDrive Energy Efficient Amplifier (IDEEA) technology for superior performance with low distortion
• Rail Sensing Limiter (RSL) for dynamic load adjustment and reduced signal clipping
• Asymmetric channel loading for optimized system efficiency and power allocation
• Auto-standby feature reduces power consumption to less than 1W when idle
• Comprehensive protection features including overload and temperature protection
• Rear panel controls for per-channel attenuation, signal LEDs, and a selectable high-pass filter
• Temperature-controlled fan with front-to-rear airflow for efficient cooling
• Dimensions: 17 x 19 x 10.9 inches
• Weight: 9.9 lbs
• Finish: Dark gray aluminum front and black steel chassis

Specifications

General

• Number of powered channels: 2
• Total output all channels driven: 400 W
• Max output voltage per channel: 100 Vp / 70 Vrms
• Max output current per channel: 11 Arms
• Asymmetric load operation: Units are capable of delivering extra power to one channel while sending significantly less to the other

Maximum Output Power (all channels driven)

• 2 Ω (Lo-Z mode): 200 W
• 4 Ω (Lo-Z mode): 200 W
• 8 Ω (Lo-Z / Hi-Z mode): 100 / 200 W
• 16 Ω (Lo-Z / Hi-Z mode): 50 / 200 W
• 70 V (Hi-Z mode): 200 W
• 100 V (Hi-Z mode): 200 W into 100 V load tapped @ 400 W

Maximum Output Power (single channels max)

• 2 Ω (Lo-Z mode): 350 W
• 4 Ω (Lo-Z / Hi-Z mode): 200 W
• 8 Ω (Lo-Z / Hi-Z mode): 100/350 W
• 16 Ω (Lo-Z / Hi-Z mode): 50/310 W
• 70 V (Hi-Z mode): 400 W
• 100 V (Hi-Z mode): 400 W into 100 V load tapped @ 800 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: >112 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

Gain, Sensitivity and Limiters

• Limit and gain switch (per channel): 2 pos: Lo-Z and Hi-Z
• VPL for Hi-Z mode: 100 V
• VPL for Lo-Z mode: 40 V
• Sensitivity for 70 V out in Hi-Z mode: 4 dBu
• Sensitivity for full power into 4/8/16 Ω in Lo-Z mode: 4 dBu
• Gain in Hi-Z mode: 35.2 dBu
• Gain in Lo-Z mode: 27.2 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 35 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: Single fan, front to rear airflow, no filter required, temperature controlled speed

Power

• Nominal voltage: 100 - 240 VAC
• Operating voltage: 70 - 265 VAC
• Standby consumption: <1 W
• Mains connector: Standard IEC receptacle

Physical

• Dimensions (HWD): 17 x 19 x 10.9 inches
• Weight: 9.9 lbs
• Finish: Dark grey aluminium front and black steel chassis