Sonos said today it has moved the ship date of its Digital Music System until mid-January due to “some fine tuning the company needs to make in regards to system performance.” Announced in June, the multi-zone music solution offers support for a wide variety of music formats, including MP3, AAC, WMA and WAV, stored on a Mac, PC or Network Attached Storage (NAS). The Sonos Digital Music System is comprised of two components: the Sonos ZonePlayer, a networked audio player that distributes, plays and amplifies music in any “zone” in the home, and the Sonos Controller, a wireless handheld device with a full-color screen which allows the user to access, customize and control the music anywhere. The Sonos Digital Music System will retail for US$499, while each Controller will retail for $399.