Ic... Cause I saw big huge difference in term of brand.
Like
fiio ranges less than 200
Ibasso ranges 200+
Rsa ranges 500+?!
I was thinking is there anything special about them which cause so much diff. I personally used fiio e7 but after nearly. 2 years of usage it port gives problem and it seems the old fiio e7 mostly suffered that problem after googling.. =_= kinda doubt whether should buy that brand of product again... Or they had changes their port to a better one which I am unsure...