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Reduced sound volume on copy?
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MatsW
Newbie
_ 		4. April 2003 @ 21:44 _ Link to this message    Send private message to this user   
I have recently made some audio CD copies and, since I have a CD changer with fine sound (Denon DCM-280), I can easily compare the sound quality between original and copy. To my surprise I thought I heard a slight difference: the original sounded slightly better (I went back and forth many times between original and copy). But then I raised the sound volume slightly on the copy and then I detected no difference.

Could the illusion that the original sounds better derive from the fact that the copy gets a slightly less sound volume than the original? Does the copy process (DAO) reduce the sound volume slightly?

Mats W
[ + quote]
tigre
Moderator
_ 		4. April 2003 @ 22:04 _ Link to this message    Send private message to this user   
Quote:
Could the illusion that the original sounds better derive from the fact that the copy gets a slightly less sound volume than the original?
Yes.
Quote:
Does the copy process (DAO) reduce the sound volume slightly?
Depends on your settings: If you normalize to < 100% during audio extraction (especially on up-to-date mainstream chart music that contains clipping natively) the volume is lowered.

If you copy audio CDs without a lossy compression step during the process, volume changes (e.g. normalizing) are not necessary and will degrade quality slightly.
[ + quote]
MatsW
Newbie
_ 		5. April 2003 @ 08:00 _ Link to this message    Send private message to this user   
Addendum: I used image copy (DAO). I didn't use any intermediate compression.
[ + quote]
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