So far I prefer the north star with the O2 and the 007tii. Bigger sounstage, more impact, but still musical. Slightly splashy up top compared to the ECD-1, but it rocks harder. The ECD-1 is lovely, but polite. Lush, smooth, and refined. Also musical. I think the Stax amp is killing the ECD-1 here. I had planned to decide between the DACs pretty quickly. I think I'll need to upgrade the amp first. Both
I expected the ECD-1 to best the north star. Not so far. But both are very satisfying DACs.