[oncdoc]

Hello my overall gear is 
 
ifi nano idsd, astell and kern ak100ii, windows pc, 
 
headphones: phillips x1, hd 650, shure se500 iem
 
question: can the ifi nano serve as an adequete headphone amp for the headphones above? listening thru pc.
 
second question: will the ak100ii power the above two over the ear headphones?
 
if not what amp should I get?
 
valhalla 2? ifi mico?
 
I know dumb questions, but brand new hobby for me. 
 
cheers.