I have 58X, HE4XX, IMR R1 Zenith, Shure SE215.
My my current favourite is the R2R into Fiio A5 portable amp into Zenith.
The reasons for this is due to the A5 having the right power available for dynamic headroom, I can power the 58X but I know they don’t have the required power being supplied yet, the HE4XX I honestly can’t understand how anyone says they can be used on portable devices as they sound awful so far, that’s not a sound...