Hissing iPod Touch -- some info...and audio not as good as Shuffle or Nano
My 16gb iPod Touch (1.1.2) hisses regardless of the quality of headphone. It is reminiscent of cassette tape hiss.
It will hiss at power-up (press bottom button).
It will hiss between songs and is apparent during song playback if the signal to noise ratio is low.
It will hiss continuously and for an indefinite period of time after the completion of a playlist -- this must affect battery life
It will stop hissing if, after completing the playlist, I go back to the main menu (bottom button)and let the unit power down automatically.
It hisses regardless of WiFi being on or off.
Taken collectively, the features of the Touch are remarkable and the technical achievement outstanding. However, as a $400 audio player, the iPod falls well short of the Shuffle and Nano (both of which I have) in terms of audio quality.
iPod Touch 16gb, Mac OS X (10.4.10)