Nothing is perfect, not even amplifiers. As long as you don't hear the hiss from your listening position, forget about it and enjoy the music.
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I have a vandersteen sub and Meridian active speakers that occasionally pick up some hum or hiss, but it's never a problem when listening. I've found that in my house, the source is the wall power and have dealt with it via power conditioning. You might try some power condition (on a test basis--don't buy unless it works). This could be hash on your AC line. A surge suppressor might even be contributing depending on the circuitry in the suppressor. Good luck and don't sweat it.