LAB GRUPPEN E 4:2_US1 400W Amplifier with 2 Flexible Output-Channels for Installation Applications (E 4:2_US1)

Vendor: Lab Gruppen
LAB GRUPPEN E 4:2_US1 400W Amplifier with 2 Flexible Output-Channels for Installation Applications (E 4:2_US1) The E 4:2 has smart green credentials delivering a low lifetime cost of ownership. Energy Star Qualified Our...

LAB GRUPPEN E 4:2_US1 400W Amplifier with 2 Flexible Output-Channels for Installation Applications (E 4:2_US1)

The E 4:2 has smart green credentials delivering a low lifetime cost of ownership.

Energy Star Qualified

Our Energy Star-qualified products achieve an extraordinary balance: maintaining exceptionally low current draw even at high output levels and minimizing power consumption during non-operational cycles. This harmonious blend allows for Lab Gruppen's impeccable sonic performance and robust power output while seamlessly meeting the stringent efficiency benchmarks of today's Energy Star certification standards.

Small in Size, Huge in Benefits

Leveraging Lab Gruppen's renowned reputation for top-tier sonic performance and unwavering durability in the touring domain, the E Series steps into the installation market with a distinct competitive advantage. This lineup introduces an ultra-compact form factor, high operational efficiency, versatile output configurations, and an unparalleled cost-benefit proposition. At the core of the E Series lies Lab Gruppen's groundbreaking IDEEA (IntelliDrive Energy Efficient Amplifier) technology. Built around a patented Class D variant output stage, IDEEA achieves remarkable power output with minimal distortion, drawing minimal mains current in the process. Exclusive to the E Series, Lab Gruppen’s proprietary Rail Sensing Limiter (RSL) plays a pivotal role in maintaining audio integrity. By significantly curbing signal clipping, it ensures consistent, high-quality audio output under all circumstances. Moreover, the user-configurable RSL adapts effortlessly to Hi-Z (70 V) or Lo-Z configurations, adeptly sensing rail voltages to optimize each output for instantaneous load conditions. This setting flexibility extends to asymmetric channel loading, enhancing both performance and efficiency. Moreover, the total available output power can be dynamically allocated among the channels, enabling scenarios such as driving a small sub on one channel while powering a cluster of 70 V ceiling loudspeakers on another.

Lab Gruppen Performance with Energy Star Compliance

Lab Gruppen’s IDEEA architecture is the cornerstone of achieving complete Energy Star compliance, merging a net operating efficiency surpassing 80% with an ingenious auto-power-down feature. This innovative mechanism triggers after 20 minutes of no input signal, seamlessly transitioning the amplifier into standby mode, consuming less than 1 W. Once an input signal is detected, it swiftly reactivates, ensuring efficiency without compromising readiness. The inclusion of GPIO facilities further enhances functionality, enabling third-party systems to remotely oversee and govern the power state through contact closure. This level of control and monitoring elevates the amplifier’s adaptability within broader operational setups.

Smart Green Credentials with Our IDEEA Platform

The now-proven IntelliDrive Energy Efficient Amplifier (IDEEA) platform represents the latest evolution of our amplifier design philosophies, drawing from technologies in our flagship PLM Series, to create ingenious contractor solutions with supreme green credentials.

Flexible Asymmetric Loading

Maximize the potential of every unit, granting you the flexibility to allocate the total available output power unevenly between channels or consolidate all power into a single channel for mono use. This adaptability empowers you to effortlessly drive a small subwoofer through one channel while commanding a series of 70 V distributed ceiling loudspeakers through another.


  • 400 W amplifier carrying 2 flexible output channels in a high power density 1 rack unit form factor saves rack space and system cost

  • Energy efficient with Energy Star certification for supreme green credentials and exceptionally low lifetime running costs

  • Flexible IntelliDrive permits delivering the 2 x 200 W at constant voltage 70 V or low impedance (2, 4 and 8 Ohms) on any channel

  • Asymmetric channel loading allows mixing and matching loads with different impedances to maximize overall system efficiency and inventory utilization

  • High efficiency amplifier with low power consumption and minimized heat generation lowers demands on the installations' mains distribution and cooling systems

  • IDEEA outputs stage based on proprietary, state-of-the-art Class-D amplifier technology for superior performance

  • Comprehensive fail safe circuit protection ensures continued operation even under reduced operating conditions

  • Auto-standby and auto-power-on reduces power consumption to below 1 W in non-operating cycles

  • Rail Sense Limiter (RSL) greatly reduces signal clipping and ensures simple configuration for constant voltage and low impedance loads

  • Built in 50 Hz high pass filter selectable per channel available on rear panel switch

  • Per-channel attenuation knob and signal LED on rear panel for simple commissioning

  • Efficient cooling with temperature controlled fan with front to back airflow

  • Aluminum front panel with power and temperature LEDs and per channel signal and limit LEDs

  • GPIO connector with power control and indication for further system integration

  • Balanced high-quality analog inputs and amplifier outputs on detachable screw terminals

Number of amplifier channels


Max total output all channels driven

400 W

Peak output voltage per channel

100 V / 70 Vrms

Max. output current

11 Arms

Max output power (all channels driven)
2 ohms

200 W

4 ohms

200 W

8 ohms

200 W (requires the “70 V” mode for the RSL. “Lo-Z” gives 100 W)

16 ohms

200 W (requires the “70 V” mode for the RSL, “Lo-Z” gives 50 W)

70 V

200 W

100 V

Can deliver 200 W to a 100 V load tapped at 400 W

THD 20 Hz - 20 kHz at 1 W


THD at 1 kHz and 1 dB below clipping


Signal to Noise Ratio

>112 dBA

Channel separation (Crosstalk) at 1 kHz

>70 dB

Frequency Response

2 Hz - 40 kHz

Input impedance

20 kOhm

Common Mode Rejection (CMR)

50 dB

Output impedance

25 mOhm

Gain, Sensitivity and Limiters
Limit and gain switch defining limit and gain (per channel)

2 pos: Lo-Z and 70 V

VPL for 70 V mode

100 V

VPL for Lo-Z mode

40 V

Sensitivity for stated power into 4 Ohm in Lo-Z mode

4 dBu

Sensitivity for 70.7 V out in 70 V mode

4 dBu

Sensitivity for stated power into 2 Ohm in Lo-Z mode

1 dBu

Sensitivity for stated power into 8 Ohm in 70 V mode

-0.9 dBu

Sensitivity for stated power into 16 Ohm in 70 V mode

2.1 dBu

Gain in 70 V mode

35.2 dB

Gain in Lo-Z mode

27.2 dB

Level adjustment (per channel)

Rear panel potentiometer, from -inf to 0 dB

Connectors and Buttons
Input connectors (per ch.)

3 - pin detachable screw terminals, electronically balanced

Output connectors (per ch.)

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

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


Single fan, front to rear airflow, no filter required, temperature controlled speed

Nominal voltage

100 – 240 VAC

Operating voltage

70 – 265 VAC

Standby consumption

<1 W

Mains connector

IEC inlet


W: 483 mm (19”), H: 44 mm (1 U), D: 276 mm (10.9”)


4.2 kg (9.3 lbs)


Dark grey aluminum front and black steel chassis