You don't really give enough info to guess. What are the old CDs? If you loaded them unto your Mac one suspects either they are very old or else religious music. Sorry, the devil made me say that. Seriously, it could be many different things or a combination thereof. If the CDs were stored in the wrong environment they could have deteriorated, you might have been unlucky in your choice of CDs, they could have been damaged in various ways, the new ones may just be better, it is hard to know.
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