hey,
i have recently played with a few quality settings.
i ripped using CDex and -q6. (yes the topic isnt correct)
there was a NOTICABLE difference between the encoded file and the cd track (listening test). (hard to explain what i heard.. its like there was some "empty" sound in the background or an echo or something.)
i can say that im only satisfied with -q8 and higher..
i havent tested with mp3 but ill do so soon.