Abstract: The Invention relates to a method for effectively transmitting power and signals to an acoustic irradiation system (1), with which a number of groups of people at different locations receive information. To this end, data in digital form, together with the power supply, are led to at least one digital amplifier module (3) via a common bus (5). The power supply of the modules is designed such that the effective power (Peff) can be uniformly transmitted. Required power peaks are covered by energy buffers of the amplifier module.

Abstract: The invention relates to a device for transmitting, receiving and processing digital audio signals which are supplied to the individual loud speaker units (4) by means of a common data bus (7). The supply of the units (4) by the data bus (7) is thus divided, the data is modulated according to the supply voltage in order to reduce the number of lines and so that the power input can be supplied centrally and monitoring and redundance, as required in security related systems, can be acquired by simple means, since only one part of the power supply must be monitored and embodied in a redundant manner.