Program selector for 100 V loudspeakers lines, compatible with CV series volume attenuators. It allows to select up to 6 different programs in one loudspeakers zone. It uses a 12 positions endless switch for the program selection: if position “6 is exceeded, program selection starts again from 1 to 6. It includes a paging security function that connects the Program 1 to the speaker bypassing the selector. Plate is 45 mm wide and compatible with all M-420x series Optimus frames (optional). Flush-mounting box included. Finishing is in white colour.