The DPA is a class-D digital power amplifier with extremely low power consumption (0.2W per channel) during standby mode, and high amplification efficiency of 90%. A four-step DIP switch can be configured to enable/disable the function of standby mode (power-save mode) when powered by AC mains- to request the LEDs on the front panel to comply to EN 54-16- and to enable/disable the battery monitoring.