The RK-MCU controller is the core unit of the INTEVIO PA system, providing audio storage, signal processing, routing, control, and supervision functions for the whole system. With a built-in 500 W Class-D amplifier, the single controller can operate as an 8-zone PA system. If more power and speaker zones are needed, it can be expanded by using the RK-AMP 500 external power amplifier and RK-ZONE8/RK-ZONE24 zone expanders.