pc vs blu ray player sound quality

I am using my pc for both music and movies.  However, ripping blu rays to my hard drive is onerous and playing blu ray discs on a computer is frustrating.  I'm a using an ifi idsd dac and tried a sony stand alone blu ray player connected to the dac via coax.  However, an A/B comparison revealed the sound quality of the stand alone player connected via coax to the idsd was highly inferior to the sound quality of the computer playing the same blu ray disc ripped to the hard drive connected to the idsd via usb.  Any ideas what would account for this difference? The convenience of the stand alone player is great but the computer's sound quality blew it out of the water, which does not make any sense to me because the pcm streams should be identical.