The LAB 4000 is a compact (2 unit high) light-weight (10 kg) power amplifier designed for high quality touring sound systems and fixed installations.
The chassis is made of 2 mm black anodised aluminium, with a 4 mm thick front panel. The switch-mode power supply is placed just behind the front panel to ensure noise free operation. Both the power supply and the two output channels are cooled by two proportional speed fans with airflow from front to back. The switch-mode power supply is the modern solution of the weight and size problem. With switch technology operating at a high frequency, it is possible to use ferrite transformers instead of heavy iron transformers and large electrolytic capacitors. Switch-mode technology has been applied in power supplies in TV-sets during the latest 30 years. But in the LAB 4000 the power capacitivity is 20 times larger. We have designed the LAB 4000 to obtain the same characteristics as a conventional power supply. Thanks to the switch-mode power supply it is easy to get the DC-rail voltage stabilised. This is made by controlling the magnetic energy in the ferrite transformer with a pulse width processor and magnetic “Flux Sense” windings.
The LAB 4000 has an upgraded version of the well known switch mode output stage from the LAB 2000. The power transistors are cooled by a solid copper cooler, called Intercooler(r), originally designed for our LAB 1300 power amplifier.
Lab.gruppen’s specially designed thermal feedback circuit protects against thermal breakdown. Short circuit protection; The LAB 4000 is completely shortcircuit
- 2 Channels
- 2x1300 W into 8 W
- 2x2100 W into 4 W
- 2x2400 W into 2 W
- At clip level with two channels driven
- Compact design, 2 U high (88 mm)
- Low weight
- MLS switches for each channel offers power matching into different loads without increased power losses
- Electronically balanced inputs
- LED indicators show output voltage and headroom
- Output cooled by Intercooler®
- Two proportional speed fans
- Independent protection circuitry
- Short circuit protection manages long-term short-circuit operations
- DC protection
- Clip limiter
- VHF protection