Same. I think it's just how these headphones are, unfortunately. I've tried two different pairs of HS70s and both have loud static/noise when on. Plugging in the wireless dongle makes it worse, with a high-pitched hissing noise in the left ear only. I've seen other users say that's just how they are. I opened a support ticket but Corsair never responded. Think best bet is to just send them back and try a different brand of wireless headphones.