Yeah, the A30 Pro is at or near the top of the leaderboards in the categories that Amir tracks. Plus it delivers gobs of power to single ended or balanced headphones.if your HPs are balanced, the a50s is a powerhouse. if your HPs are unbalanced, @JohnYang1997 has said that he designed the L30 for clean power to unbalanced (and the a50s for clean balanced power). what you could do is get a d50s and an a30pro. iirc the a30pro leads the 50mv leaderboards, does it not?
another option, if you're only driving IEMs, is the sonata HD pro and saying pshaw to the pressure to buy TOTL. My ER4s sound GREAT through the sonatas on my PC, and for 50$ it's impossible to go wrong. the cs4313 is an incredibly little chip.