I may missed something but : Ipod nano as good as the Fiio X7? How can it be possible? I don't have the ipod nano 7th but I have the Iphone 6s. I have tested the Fiio X7 last week and the X7 sound quality is very far better than the Iphone 6s. Is the ipod nano 7th an alien amongst Apple product ? 

They are pretty close to my ears, thats how i heard them, maybe my hearing is impaired, maybe my ipod is weird, beats me

Nah... I won't beat you  but I am only surprised... As far as I tested, Apple product is not audiophile product.