I've recently received my Shure se535, which is a fantastic sounding IEM, and it is also my first high class IEM at all. However, I can hear a lot of background hiss from the se535 when I connected to my my MacBook Pro. I have also tried to connect to my home use DAC and HPA, I can still hear some hiss from my home rig, but a lot lesser than the MacBook Pro. Are there any suggestion that I can do to decrease the background hiss? I had order a Cowon J3, but still on the way to my place :-D.