A system for automatic device selection and for media content playback, the system comprising: a mobile device that transmits media content; a first media device positioned in a first media zone; and a second media device positioned in a second media zone; wherein the first media device is configured to be wirelessly coupled to the second media device and to the mobile device, and wherein the first media device comprises: means to receive a first signal from the second media device; means to measure a signal strength of the received first signal; means to determine a first distance of the second media device from the firs media device based on the measured signal strength of the received first signal; means to receive a second signal from the mobile device; means to measure a signal strength of the received second signal; means to determine a second distance of the mobile device from the first media device based on the measured signal strength of the received second signal; means to playback the media content from the mobile device in the first media zone if the second distance is less than the first distance; and means to transmit an inaudible signature to the mobile device, if the first distance and the second distance are generally similar to one another, and wherein the mobile device comprises: means to compare the inaudible signature to a first stored inaudible signature corresponding to the first media device and to transmit the media content to the first media device for playback if the inaudible signature matches the first stored inaudible signature, and means to compare the inaudible signature to a second stored inaudible signature corresponding to the second media device and to transmit the media content to the second media device for playback if the inaudible signature matches the second stored inaudible signature. a mobile device that transmits media content; a first media device positioned in a first media zone; and a second media device positioned in a second media zone; wherein the first media device is configured to be wirelessly coupled to the second media device and to the mobile device, and wherein the first media device comprises: means to receive a first signal from the second media device; means to measure a signal strength of the received first signal; means to determine a first distance of the second media device from the firs media device based on the measured signal strength of the received first signal; means to receive a second signal from the mobile device; means to measure a signal strength of the received second signal; means to determine a second distance of the mobile device from the first media device based on the measured signal strength of the received second signal; means to playback the media content from the mobile device in the first media zone if the second distance is less than the first distance; and means to transmit an inaudible signature to the mobile device, if the first distance and the second distance are generally similar to one another, and means to receive a first signal from the second media device; means to measure a signal strength of the received first signal; means to determine a first distance of the second media device from the firs media device based on the measured signal strength of the received first signal; means to receive a second signal from the mobile device; means to measure a signal strength of the received second signal; means to determine a second distance of the mobile device from the first media device based on the measured signal strength of the received second signal; means to playback the media content from the mobile device in the first media zone if the second distance is less than the first distance; and means to transmit an inaudible signature to the mobile device, if the first distance and the second distance are generally similar to one another, and means to playback the media content from the mobile device in the first media zone if the second distance is less than the first distance; and means to transmit an inaudible signature to the mobile device, if the first distance and the second distance are generally similar to one another, and wherein the mobile device comprises: means to compare the inaudible signature to a first stored inaudible signature corresponding to the first media device and to transmit the media content to the first media device for playback if the inaudible signature matches the first stored inaudible signature, and means to compare the inaudible signature to a second stored inaudible signature corresponding to the second media device and to transmit the media content to the second media device for playback if the inaudible signature matches the second stored inaudible signature. means to compare the inaudible signature to a first stored inaudible signature corresponding to the first media device and to transmit the media content to the first media device for playback if the inaudible signature matches the first stored inaudible signature, and means to compare the inaudible signature to a second stored inaudible signature corresponding to the second media device and to transmit the media content to the second media device for playback if the inaudible signature matches the second stored inaudible signature.