I'm a newbie and I just stepped on the hifi land =)
Recently I followed Dsnuts' hype and bought the SHE3580, the Monoprice 8320, the FX40 and the FX101. It turn out that his recommendation is very accurate and these IEM is very cool! But sadly, my FX101 got a lot of "hissing" background noise whether connected to my Fiio e6, my ipod or my mac. So I'm quite worry. I don't know if I got a defective or not.
And also, why almost all my headphone (except my HD439) make background noise when I connect it directly to my macbook air? Is that a fault in the hardware? I have no such problem when connect it through my Fiio e6, so I have to carry it around all the time lol.