Rated 4.9 (84 reviews)
The Lab Gruppen E4:2 is a two-channel, 400 W install amplifier delivering 2 × 200 W from a 4.2 kg, 1U chassis, designed and engineered in Sweden for commercial background music and paging systems. Each channel switches between 70 V constant-voltage lines and Lo-Z loads down to 2 Ω, with asymmetric loading across the pair, so a distributed ceiling run and a low-impedance pair can share one amplifier. Energy Star certification, sub-1 W standby and the IDEEA Class-D stage keep power bills and rack heat down.
2 × 200 W
Output power
2 Ω
Minimum load
70 V
Hi-Z mode
<1 W
Standby draw
RSL mode and 8/16 Ω loadsThe per-channel RSL switch sets the limiter for Lo-Z or 70 V operation, and it affects available power: an 8 Ω load gets the full 200 W only in 70 V mode (Lo-Z gives 100 W), and a 16 Ω load gets 200 W in 70 V mode (Lo-Z gives 50 W). The amplifier can also deliver 200 W to a 100 V line tapped at 400 W. Match the switch to the connected load during commissioning.
Features
400 W across 2 flexible output channels in a 1U form factor
Energy Star certified with exceptionally low lifetime running costs
IntelliDrive delivers 2 × 200 W at 70 V constant voltage or into 2, 4 and 8 Ω loads
Asymmetric channel loading mixes different impedances on one amplifier
Proprietary IDEEA Class-D output stage
Rail Sense Limiter (RSL) greatly reduces signal clipping and simplifies configuration
Auto-standby and auto-power-on cut consumption to below 1 W between uses
Built-in 50 Hz high-pass filter, switchable per channel on the rear panel
Per-channel attenuation knob and signal LED on the rear panel for commissioning
Temperature-controlled fan with front-to-back airflow
Aluminium front panel with power, temperature and per-channel signal/limit LEDs
GPIO connector with power control and indication for system integration
Balanced analogue inputs and amplifier outputs on detachable screw terminals
Designed and engineered in Sweden
Specifications
| Amplifier channels | 2 |
| Max total output, all channels driven | 400 W |
| Output per channel | 200 W into 2 Ω, 4 Ω or 70 V; 200 W into 8 Ω in 70 V mode (100 W in Lo-Z); 200 W into 16 Ω in 70 V mode (50 W in Lo-Z); 200 W to a 100 V load tapped at 400 W |
| Peak output voltage per channel | 100 V / 70 Vrms |
| Max output current | 11 Arms |
| THD (20 Hz – 20 kHz @ 1 W) | <0.1% |
| THD (@ 1 kHz, 1 dB below clipping) | <0.05% |
| Signal-to-noise ratio | >112 dBA |
| Channel separation @ 1 kHz | >70 dB |
| Frequency response | 2 Hz – 40 kHz |
| Input impedance | 20 kΩ |
| Common mode rejection | 50 dB |
| Gain | 35.2 dB (70 V mode); 27.2 dB (Lo-Z mode) |
| Level adjustment | Rear panel potentiometer per channel, -inf to 0 dB |
| Input connectors | 3-pin detachable screw terminals, electronically balanced (per channel) |
| Output connectors | 2-pin detachable screw terminals (per channel) |
| High-pass filter | Fixed 50 Hz, switchable per channel |
| GPIO | Contact-closure GPI power control and GPO power-state output on 2-pin screw terminals |
| Cooling | Single fan, front-to-rear airflow, temperature-controlled speed |
| Mains | 100-240 VAC nominal (70-265 VAC operating), IEC inlet |
| Standby consumption | <1 W |
| Dimensions (W × H × D) | 483 × 44 × 276 mm (1U, 19″) |
| Weight | 4.2 kg |
| Finish | Dark grey aluminium front, black steel chassis |
| Approvals | CE, RoHS, WEEE, UL 60065, CSA C22.2 No. 60065, FCC Part 15 Subpart B Class A, PSE, CCC, Energy Star |
| Warranty | 1 year |
