Redundant power supply

A power supply arrangement for a distributed entertainment system (10). The power supply arrangement comprises: first (26) and second (30) power supplies, which are floating in relation to each other; first electrical connection means (38) having a distributed impedance (40) for connecting zone apparatus (14) to the first power supply (26), signal processing means (32) which is operative to draw power from the second power supply (30) and to transmit electrical signals to the zone apparatus and/or receive electrical signals from the zone apparatus, and in which the zone apparatus is operative to draw current from the first power supply thereby causing a potential drop across the distributed impedance of the first electrical connection means which in turn changes a voltage of a power supply rail (48) at the zone apparatus, characterised by second electrical connection means (46) for connecting the power supply rail of the zone apparatus to a power supply rail (50) of the second power supply.