![]() I would strongly advise against storing all your music in Atrac/Atrac 3 format (which is proprietary) because you will find it extremely difficult to re-encode these files to anything else. A big exception to this is with Sony and their Atrac/Atrac 3 format. Also, with a car player or a portable player you might often want to use a lower bitrate than you would use at home since the listening environments these are used in are typically not high quality listening environments so more quality will not necessarily be appreciated in those contexts. ![]() Third, if you have a car mp3 and/or wma player, or if you have a portable musical device (such as an iPod) then you will probably want to consider using a format that is compatible with your portable device. Second, if you don't have a player that will play a given format then that format is not a good choice for you. First, if you have a lot of mp3's or other music encoded at 128 kbs, it makes little sense to re-encode at a higher bitrate (as has been discussed earlier in this thread). A potential drawback to mp3pro, as has been pointed earlier, is that for highest quality playback you do need to use an mp3pro player, otherwise the file will be read and played (and heard) as an mp3 file so that your 96 kbs mp3pro file will sound like a 96 kbs mp3 file. mp3 quality then you might want to consider wma or mp3pro where you can get the same quality for about 96 kbs (to my ears). If space is more of a consideration then go with one of the lossy formats at lower bitrates. I have not toyed with wma to see if their quality per space advantage would carry over to higher frequencies in which case I met get by with similar quality for about 160-160 kbs. My own experience indicates that somewhere around 220-250 kbs appears to be my personal limit beyond which I can no longer distinguish differences in quality. How high that level will be will be determined by your ears alone. If, however, you are concerned about maintaining quality but economizing on disk space, then you would want to go with one of the lossy formats (mp3, ogg, musepack, wma, mp4/aac) but encoded at a fairly high level. Logically, if quality is the only consideration you would want to choose one of the lossless formats, of which Flac and Ape are the most pre-eminent. I'm afraid that you need to be more specific as to what factors are important to you.
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