Hello nms!
I'm about to buy a Motu 828MK3 so I just wanted to check something with you, regarding your converter tests. I saw you did turn down the level of files to -2dBFS for testing, avoiding the soft limiter that way, but have you done any testing with 828MK3 with *both* the V-Limiter and soft limiter turned off? You can turn them both off. It's just hard to believe that MK3 would sound worse than MK2 and to tell you the truth that saw wave does look like it went through some kind of limiter or compressor.
Thank you so much for that thread and all the work you've done. It's great! I might test my AD-DA chain, too, when I acquire the AD part.
Cheers!