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Lab Gruppen E 4:2 2-Channel Amplifier

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New technology and Energy Star™ 2.1In designing the new E Series, Lab.gruppen engineers drew upon the cutting-edge amplifier design philosophies developed for the flagship PLM™ 20000Q Powered Loudspeaker Management system, evolving these to create new circuit topologies and control features to me... Read More

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New technology and Energy Star™ 2.1

In designing the new E Series, Lab.gruppen engineers drew upon the cutting-edge amplifier design philosophies developed for the flagship PLM™ 20000Q Powered Loudspeaker Management system, evolving these to create new circuit topologies and control features to meet the demands of 21st century AV installations. The result is a new amplifier platform called IDEEA: IntelliDrive Energy Efficient Amplifier. The principal design challenge was maintaining Lab.gruppen's impeccable sonic performance and robust power output while meeting – or exceeding – the rigorous efficiency requirements of Energy Star 2.1 certification. The challenge was met on two fronts: reducing current draw during operating cycles with vigorous program material and high output levels, and reducing power consumption during non-operational cycles.

New power supply and output stage

For peak operating efficiency, the E Series incorporates a new high-headroom universal power supply accepting any mains voltage from 70 to 265 V at 50 or 60 Hz. A higher storage capacity in the power supply prevents excessive draw on the mains inlet during repeated peak bursts, maintaining extra headroom on the supply rails for sustained maximum output with minimal distortion. The Class D output stage is highly efficient (above 90%), while the inherently bridged topology allows up to twice the rated power output on one channel when the other channel is unused or driving a low power application. RSL™: Mix, match and balance loads The new Rail Sensing Limiter (RSL) is the latest refinement of Lab.gruppen's proprietary approach to optimizing amplifier output characteristics to match the connected load. Each channel has a two-position switch that sets the output for driving either low impedance or high impedance (70 V) loudspeaker systems, with a +4 dBu sensitivity regardless of load type. RSL works in conjunction with the high headroom power supply and inherently bridged output stage to allow asymmetric loading. Power resources in the amplifier can be utilized to maximum advantage, with one channel producing far beyond its rated output when the other channel has lesser power requirements.


  • High power density – Up to 2 × 600 W in 1U
  • Certified Energy Star 2.1 compliant
  • Flexible – IntelliDrive delivers similar power per channel at 70 V, 2, 4, 8 and 16 ohms
  • Asymmetric loading allows "mixing and matching" of loads with different impedances to maximize both overall system efficiency and inventory utilization
  • Patented IDEEA output stage based on Class D topology
  • High efficiency – Extremely low power consumption and heat output
  • Exceptionally low cost of ownership over lifetime
  • RSL switch circuit senses rail voltage and optimizes output for instantaneous load conditions
  • Efficient cooling – One temperature-controlled fan
  • Comprehensive circuit protection and fault indication

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Product Specs

Number of Channels2
Max Total Output All Channels Driven400 W
Peak Output Voltage Per Channel100 V / 70 Vrms
Max. Output Current Per Channel11 Arms
Max.Output Power Per Channel (All Channels Driven)
2 Ohms (Lo-Z Mode)200
4 Ohms (Lo-Z Mode)200
8 Ohms (Hi-Z Mode)200
16 Ohms (Hi-Z Mode)200
70 V (Hi-Z Mode)200
8 Ohms (Lo-Z Mode)100
16 Ohms (Lo-Z Mode)50
THD 20 Hz - 20 kHz for 1 W<0.1%
THD at 1 kHz and 1 dB Below Clipping<0.05%
Signal to Noise Ratio>112 dBA
Channel Separation (Crosstalk) at 1 kHz>70 dB
Frequency Response2 Hz - 40 kHz
Input Impedance20 kOhm
Common Mode Rejection (CMR)50 dB
Output Impedance25 mOhm
Gain, Sensitivity and Limiters
Limit and Gain Switch (per channel)2 pos: Lo-Z and Hi-Z
VPL for Hi-Z Mode100 V
VPL for Lo-Z Mode40.0 V
Sensitivity for 70 V Out In Hi-Z Mode4 dBu
Sensitivity for Full Power Into 4/8/16 Ohms in Lo-Z Mode4 dBu
Gain in Hi-Z Mode35.2 dBu
Gain in Lo-Z Mode27.2 dB
Level Adjustment (Per Channel)Rear Panel Potentiometer Detented from -inf 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 FilterFixed at 50 Hz, switchable per channel
Power ControlCan 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
CoolingSingle fan, front to rear airflow, no filter required, temperature controller speed
Nominal Voltage100 - 240 VAC
Operating Voltage60 - 265 VAC
Standby Consumption<1 W
Mains ConnectorIEC Inlet
DimensionsW: 483 mm (19”), H: 44 mm (1 U), D: 276 mm (10.9”)
Weight4 kg (8.8 lbs.)
FinishDark grey aluminum front and black steel chassis
Warranty3 years, components and factory workmanship. See full warranty statement.

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