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      01-07-2013, 02:10 PM   #17
bbbuzzy
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Drives: '13 335is convertible (manual)
Join Date: Mar 2009
Location: north of Boston

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MP3 files (and other audio files) are compressed. This often causes lower fidelity. I'm not sure of the current file formats and whether they've changed much in the last few years (Probably?), but here's an authority on some of the technical differences:

http://www.stereophile.com/features/308mp3cd/
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'13 335is convertible (manual)
'11 X3 xdrive35i
'15 Sienna Limited AWD (road tripper)
'06 330i MT, sport,premium (retired)