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Wharfedale 8.2 active monitors hiss when nothing playing?

Hi,
Upon several recommendations from this and other forums I bought a pair of Wharfdale 8.2 Diamond pro active monitor speakers.

Ive just plugged the power in, turned them on and without even plugging in a music cable yet I can hear a hiss (on 1/4 volume, which is quiet).

This is extremly frustrating, does anyone have any ideas why this may be happening?