Nice combo. I pair this zx707 to Beyerdynamic 990 pro x, sounds like real concert whatever songs i put it on, if you ever to think about getting over ear headphones, try that, not expensive though

This is magical from money, which I cant have it

If I am poor, yeah. If I am rich, no quite. If I am audiophile, I probably connect this dap to an amp and use balanced cable to a 600ohms openback headphone for maximizing soundstage and transient nuances bla bla bla Conclusion：I think this is decent if you feel satisfying and mesmerizing when listening music

IEM within 200$ range are consider novice, if talking about Sennheiser’s. I would recommend you go for Chi fi’s like Fiio or Moondrop with the similar price range they got more advanced quality iems. Sennheiser IE200 just slighty sits below middle range and really easy to become your second iem later on.

I believe these burn in stuff back then, but after I joined a few manufacturer jobs, this thing is kind of myth, because most of the stuff already tested at least certain of times before you can even buy it, and the burn in effect, is actually how your ears start to adapt the headphones imo, that product doesn’t do anything at all even you burned in whole day. Unless you are buying some really antique 2nd hand headphones like 10 years not in use, then a little burn time to reactivates the components is makes more sense