Yamaha PW4000 is a power supply unit designed specifically for the PM4000 Series consoles. It provides the necessary DC voltages to the console via the umbilical power cable, ensuring stable and reliable operation. With its multiple output voltages (+20V, +12V, and +48V), the PW4000 can power various components within the console, including preamps, compressors, and effects processors. The front panel features a range of LEDs that indicate the status of the power supply, including power on, thermal overload, and output voltage levels.