http://www.bmwusa.com/Standard/Conte...etHqX4Khm3BQ==
Logic7 Audio System
It's a sound experience as remarkable as the BMW driving experience. Unlike traditional stereo systems, Logic7 routes two-channel (stereo) sound through a seven-channel playback matrix to create 360-degree Surround Sound. The anti-theft AM/FM stereo CD/MP3 player audio system includes 13 upgraded speakers (including 2 subwoofers), Digital Sound Processing (DSP), Radio Data System (RDS), Auto-Store and 3-channel FM diversity antenna, and it displays MP3 song title and artist.