This is interesting, thanks for sharing.. though i couldn't figureout much difference in my first test.. will do a more detailed one.I've compared the two extensively. Playing from HDD beats NAS on all counts: better focus, better sound stage, more detail. I believe the sq will improve even more with a better hdd cable and replacement by SSD.
Caveat: There appears to be a limit on the folder size on the hdd. I wouldn't go beyond 1tb