Apparatus for through-connecting audio signals between a broadband network and audio sources, as well as audio sinks, comprises a plurality of audio sources which are connectible to an audio source bus having stereo capability by way of source matching assemblies and a plurality of audio sinks which are connectible to an audio sink bus having stereo capability via sink matching assemblies, and a transfer and mixing assembly by way of which the audio source bus is connected to an audio transmission bus of the broadband network and the audio sink bus can be connected to an audio receiving bus of the broadband network or to the audio transmission bus.