Good observation.
I always trusted on FLAC from PCM source, so now that i got a new Henry Audio unit then i got interested to test sound quality between wav and flac and and i see that wav has better sound in detail than flac, this is very disappointing to me considering that i trusted in flac to maintain all the information on the track, however i dont understand why it is lost in flac if theoretically it should be the same. I will be more testing about it when i have time for.