It depends upon the format that the CDs were ripped to. IMO if a CD is ripped to mp3 then burned back to audio CD there will be a noticable reduction in sound quality from the original cd. If you use one of the lossless compression formats (e.g. FLAC) to burn a cd it will be identical to the original and so there is no reduction in the quality of the audio.
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AvFan
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