Gerry, your question isn't entirely clear, but if you mean can a Blu-ray player play CDs just as well as a "dedicated" CD player can, the answer is yes. Playing CDs has reached a state of technological maturity quite a while ago and even very modestly priced players(including those that also play DVDs and Blu-rays)do so with audibly flat response and inaudibly low noise and distortion. Better than that isn't possible, despite manufacturer claims and fanciful reports of some reviewers.

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Enjoy the music, not the equipment.