Patent ID: 7236600

Claim:
Apparatus comprising an audio distribution unit ( 10 ) having means ( 11 ) for providing audio signals from audio sources and output ports ( 12 A . . . 12 D) for supplying sets of audio transducers, each said set comprising at least a first audio transducer ( 14 A(L)) and a second audio transducer ( 14 A(R)) and having associated therewith at least one remote unit ( 34 A) for controlling the audio distribution unit by means of digital data signals, the first and second audio transducers ( 14 A(L), 14 A(R)) and the remote unit ( 34 A) being connected to the audio distribution unit ( 10 ) by a set of four conductors, the apparatus further comprising means ( 22 A . . . 22 D, 44 , 76 , 80 - 96 ) for supplying audio signals to each of the audio transducers ( 14 A(L), 14 A(R)) by way of a respective pair of said four conductors and transferring power and said digital data signals between said audio distribution unit ( 10 ) and said remote unit ( 34 A) by way of at least two of said four conductors.