Dobrescu George
Reviewer: AudiophileHeaven
There aren't that many daps that can offer technically better SQ than ZX2 other than Hm901s,Paw Gold,Ak380,Qp1r(toss up).Then there is the matter of synergy with some of these daps because of unique sig of ie800,for example Marcus over at Headfonics thought that the ie800 sounded big and spacious through Lotoo Gold but the treble was hot.Speculating here but i believe the single best dap would be HM901s with balanced cable for ie800 without stacking.Otherwise just get chord mojo and be done with it.
Of course, there is also Fiio DAPs, which are cheap and great, and X7 will support balanced out.
And Chord Hugo, which should be the ultimate portable solution, though it is way pricey.
Zx2 seems awesome though, so I do not dismiss it as the ultimate dap, only that even if it might not be the case with IEMs, I would always want to have more power on hand (ZX2 has only 15mw if memory serves me well). Though I did read that it sounds pretty sweet!