I hear the same "white noise" with my setup (Bryston B60R, Triangle Heliade ES). I can also hear it through the midrange, although at a lower level. I have noticed the same sort of hiss with previous audio systems, and it is only apparent when I put my ear next to the speaker, so I don't worry too much about it.
That said, you might try separating your cables from your power cords to be sure your not picking up emf noise.
That said, you might try separating your cables from your power cords to be sure your not picking up emf noise.