Of its generation being the key words. Here is an excerpt from a Home Theater Review article from 2009 (the 83's generation)

Performance-wise, I have no criticisms of the Oppo BDP-83, which is an amazing statement, considering the player's low price and ambitious list of performance features. Yes, the audiophile in me would have liked to see the inclusion of better analog audio circuits, but I realize that this player was not designed to be a cost-no-object, reference-grade audio source

The OP did not give the age of his Cambridge Audio DAC but anything newer than 2010 would be an improvement to the analogue out of the BDP-83