I've just recorded a little shootout between those two converters, here are the clips:
Apogee AD-16X
Digidesign 192 IO
both clips are 24/44.1k
Chain: PRS Custom24 with BKP Aftermath -> Mesa RevF Rectifier -> Bogner Ubercab (v30) -> single Royer R-121 -> BAE 1073 (300Ω -> Patchbay Split -> Apogee/Digidesign
Quite a difference there IMO....I was too lazy to split it into my Digi96 and RME ADI8 as well, might do that another time, today it was only about those two high end ADs
Apogee AD-16X
Digidesign 192 IO
both clips are 24/44.1k
Chain: PRS Custom24 with BKP Aftermath -> Mesa RevF Rectifier -> Bogner Ubercab (v30) -> single Royer R-121 -> BAE 1073 (300Ω -> Patchbay Split -> Apogee/Digidesign
Quite a difference there IMO....I was too lazy to split it into my Digi96 and RME ADI8 as well, might do that another time, today it was only about those two high end ADs