The orignal recordings are high quality recordings used to create a first version. (Ex: On vinyl)
If something is remastered, it often means the original recordings are used again to create a new version. (ex: a CD version.)
As the original recordings are used, the new remastered version (CD) can be of higher quality than the original version (Vinyl).
Remastering on the same target medium can also be done take advantage of newer and better techniques to further improve quality.
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