In the forum some have alluded to that the DAP would benefit from burn in? if so for how long? what method? just leaved it plugged in and play for 5 days?    is this a old wives tale?

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...