The Bosch PRS-4P125 based 4 channel basic amplifier. The unit is used for situations where no built-in digital signal processing functions, such as equalizers, delay and AVC are required. The amplifier does not have a Praesideo network connection. Instead, it is connected to the Praesideo network via the PRS-16MCI Multi Channel Interface, which provides the basic amplifier with audio signals and has full control.