Thanks for the insight... I also have a Zishan z2 with Walnut F1 amp... would the Walnut F1 suffice?I owned ak120ii (tried it with Zen Black) which is better than 100ii. Both have weak amp and mid-fi sound in general. Definitely won't be enough for high ohm earbuds to their full potential. I would suggest some portable dac\amp+smartphone or cheap DAP like shanling m0. m1, ap60 etc... for example consider aks1305p - the best sound you can get under 400$.
Again, much appreciated!