I use a mainline and a whammy. My set up allows me to directly A/B between the old and new bifrost. There was no comparison when the new one was cold. It sounded like crap cold compared to the old one (warm). Once the new one warmed up for an hour, it was fine.Yeah the bass quantity increased throughout the day and mids opened up a bit. To me, however, it still sounded great cold
What amp were you using? I've been using the Jot balanced all day, which has pretty tight defined bass and forward mids so maybe that helped. The Bifrost 2 + Jot balanced really sounds great.
I realize this nears close to audio science, but I just don’t see how a person can compare something as subtle as a DAC with out instant A/B testing. That’s just me.