Quote:
Originally Posted by pumaknight
1. amplification comes from the ipod if you have it connected, not the head unit, so overlal sound quality will be lower than that from the head sources (CD / Radio etc)
2. bad quality recordings from itunes will not use the DSP system to its best - you need HQ recordings or original cds to hear the best (yep, that is the embarrassing bit for me).
3. Select music in the head unit Eq section as that gives the best across range tonal quality for the installed speakers.
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Amplification is still done in the head unit, but the audio is decoded (and converted to analog) in the ipod instead of the head unit. Depending on the ipod, this is either a good or a bad thing. But sound quality will not be significantly lower and might even be higher if you use the right ipod.
If you use losslesly encoded alc or 256kbps vbr aac encoded files you should get exactly or about the same quality (respectively) as a cd.