1)Your Location(city and Country )
Just over 400 pairs now, over 70% are IEM. Too many to list so please check my profile for the complete list: here.
3)Your music player
Over 20 units, but the most noticeable one include: FiiO X5 and X5 2nd Gen, iBasso DX50, Hifiman HM901, Sony NWZ-A15, Apple iPod nano 7G. Complete list is in my profile.
4)The headphone amplifier you have used before or are using now
Have about 60 portable...