First of all, I would like to thank Fiio for letting me one of review tour members and providing me with a sample of X3 2nd(X3K/X3 II). This is my honest opinion.    Unboxing:                        Size comparison with X1 and AK120:            Quick review for operation of X3 2nd:      Sound Quality(phoneout):   I have owned Fiio X1, X5, AK120, and Cayin N6 and had owned Colorfuly C4 and HM-901. Sometimes I do comparison with them. The word "more" doesn't mean "better" for me. Even if I say...