Host interface for a media device, the host interface comprising - a first host audio terminal for receiving a first analog audio signal; - a second host audio terminal for receiving a second analog audio signal; - a first connector audio terminal for connecting a first pole of a four-pole connector; - a second connector audio terminal for connecting a second pole of the four-pole connector; - a connector microphone terminal for connecting a third pole of the four-pole connector, the host interface being configured to send clock information and power over the connector microphone terminal; - a data transmitter that is configured to send an encoded digital audio signal to the connector microphone terminal; and - a host control circuit (HCTRL) that is adapted - to detect whether a device is connected that requires a supply signal over the four-pole connector and further requires a further supply signal over the four-pole connector; - if no device requiring the supply signal and/or the further supply signal is detected, to pass the first analog audio signal to the first connector audio terminal and to pass the second analog audio signal to the second connector audio terminal; and - if a device requiring the supply signal and the further supply signal is detected, to connect the first connector audio terminal to a supply terminal and to connect the second connector audio terminal to a further supply terminal. - a first host audio terminal for receiving a first analog audio signal; - a second host audio terminal for receiving a second analog audio signal; - a first connector audio terminal for connecting a first pole of a four-pole connector; - a second connector audio terminal for connecting a second pole of the four-pole connector; - a connector microphone terminal for connecting a third pole of the four-pole connector, the host interface being configured to send clock information and power over the connector microphone terminal; - a data transmitter that is configured to send an encoded digital audio signal to the connector microphone terminal; and - a host control circuit (HCTRL) that is adapted - to detect whether a device is connected that requires a supply signal over the four-pole connector and further requires a further supply signal over the four-pole connector; - if no device requiring the supply signal and/or the further supply signal is detected, to pass the first analog audio signal to the first connector audio terminal and to pass the second analog audio signal to the second connector audio terminal; and - if a device requiring the supply signal and the further supply signal is detected, to connect the first connector audio terminal to a supply terminal and to connect the second connector audio terminal to a further supply terminal. - to detect whether a device is connected that requires a supply signal over the four-pole connector and further requires a further supply signal over the four-pole connector; - if no device requiring the supply signal and/or the further supply signal is detected, to pass the first analog audio signal to the first connector audio terminal and to pass the second analog audio signal to the second connector audio terminal; and - if a device requiring the supply signal and the further supply signal is detected, to connect the first connector audio terminal to a supply terminal and to connect the second connector audio terminal to a further supply terminal.