Well it seems it is indeed my source. So I guess now is that hard question. I like the feel of the Shure / Westone style IEMs, but I need something for on the go with my Galaxy S. I was thinking maybe the Westone 1 would have the least hiss?
I tested the se535's with my laptop and the hiss was mildly annoying, but not bad. On my desktop with X-Fi sound card it is barely audible.
I really hate the options of an attenuator. I tried the one that came with the se535s and sure, it works, no hiss, but also less sound quality. Seems dumb to spend $$$ for these IEMS and then have to use an attenuator, thus defeating your purpose.
I was thinking perhaps something inferior in sound quality, but not total crap, ie - Westone W1 perhaps?
Westone 2 or UM2 will do a better job.