That's strange then. So when you turn up the volume you are more likely to hear it you are saying? It's not a constant hiss regardless of the volume? I wonder if it's the amp section picking up on hiss form the DAC then or maybe its the screen. Can you see if this noise happens when the screen is on and off?
I've done a quick test previously where I cranked the volume all the way up (with nothing playing) and all the way down. The noise doesn't noticeably get louder or quieter......it might just a tad but I didn't try it enough to say it definitively does. If it does get louder with louder volume it is a very minute amount.
EDIT: I just took it out with the TG334 to try. The background noise doesn't noticeably get louder or quieter changing the volume. Screen on and off doesnt' seem to change anything either. It is really a minor thing, u can't hear it unless you're listening for it in a quiet room.....it's just not a complete black background like I get with Pico Power or Pico Slim.
Edited by sensui123 - 9/19/13 at 9:37pm