Pre-emphasis (during CD mastering) is essentially turning up the treble
with a very specific EQ curve.  There is a bit in the data stream from
the CD that indicates it the treble has been so boosted when the disc
was recorded so that the CD player can automatically apply the
complementary treble cut when the disc is played back to restore the
original sound.  iTunes does this automatically when ripping such a
disc so the resulting files will sound right.  Exact Audio Copy does
not, so I apply the treble cut to the WAV files using an audio editor
program called Cool Edit.

Why do record companies occasionally go through and cause listeners all
this potential hassle?  Well, CD emphasis can reduce the already low
hiss level of a CD a little bit further.  Most popular recordings come
nowhere near to utilizing the low hiss level CD is capable of, though,
so very few producers bother with emphasis.


-- 
Timothy Stockman
------------------------------------------------------------------------
Timothy Stockman's Profile: http://forums.slimdevices.com/member.php?userid=8867
View this thread: http://forums.slimdevices.com/showthread.php?t=43910

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