I'm running the same setup. They are great speakers since they were cheap. They have good sound, loud and my only complaint is the hiss. The only thing I found is to have your volume up around 85% (it seems the quality degrades if it is maxed) in the volume control for wave, play control, etc.. and then adjust your speakers accordingly. If you have that slider at say 50% then you have to turn the speakers up much more and that's when the hiss get's pretty bad.
I don't notice the hiss unless the room is perfectly quiet and there is no sound coming from the speakers.