The Lab.Gruppen E 4:2 Amplifier – 2 × 200W 1U Installation Power Amp is a compact and reliable power amplifier designed for professional installed audio systems. Developed by Lab.Gruppen, this amplifier delivers 2 × 200 watts of clean and efficient output power, making it suitable for a wide range of commercial sound applications including conference rooms, restaurants, retail stores, hospitality venues, and educational facilities. Its flexible two-channel output architecture allows integrators to configure the amplifier for both low-impedance speaker systems and 70V/100V distributed audio networks, providing excellent versatility for modern installation projects.
The E 4:2 amplifier is built with a space-saving 1U rack-mount design, allowing easy installation into standard AV equipment racks while maintaining efficient cooling and reliable performance during long operating hours. Its energy-efficient Class-D amplification technology ensures stable operation with reduced power consumption, making it ideal for installations that require continuous audio playback such as background music systems or public address setups. Advanced protection features help safeguard the amplifier and connected speakers from overload, overheating, and signal distortion.
Designed specifically for system integrators and AV professionals, the amplifier provides straightforward connectivity with mixers, DSP processors, media players, and DJ controllers. The flexible output channels allow balanced power distribution to multiple speakers while maintaining consistent sound clarity across the entire audio zone. Whether powering ceiling speakers in a corporate building or driving surface-mount speakers in outdoor hospitality areas, the E 4:2 delivers dependable audio performance with professional-grade reliability.
Overall, the Lab.Gruppen E 4:2 installation amplifier is an excellent choice for commercial audio environments that require compact size, energy efficiency, and flexible speaker configuration. Its durable construction, professional audio quality, and installation-friendly design make it a practical solution for modern distributed sound systems.
Features
- 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
Specifications
General
| Number of amplifier channels | 2 |
| 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 |
Performance
| THD 20 Hz – 20 kHz at 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 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 |
| 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 | IEC inlet |
Dimensions
| Dimensions | W: 483 mm (19”), H: 44 mm (1 U), D: 276 mm (10.9”) |
Weight
Finish
| Finish | Dark grey aluminum front and black steel chassis |
Approvals
| Approvals | CE, RoHS, WEEE, UL (UL 60065), CSA C22.2 NO. 60065, FCC Part 15 Subpart B Class A, PSE, CCC Energy Star |
SKU-LSG-T1S8M3E1/20
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