thanks for all the insight, I want to get the X1A as an upgrade but it seems the jack issue is still not solve same with 300R, so it might be out of my choices. I'll compare both AK70MK2 and ZX300 when I got the chance to go to egghead. Hopefully either one of them will be a goodpair to CA Orion
If I were you I would spend my money for an upgrade for the IEM's. The jump in sound quality would probably be much more significant than the one you'll get with a DAP change.