My Roccat Kave has a problem of loud hissing/white noise when just having it powered: no matter if audio plugs are connected or not and no matter if powered by AC to USB adapter or a laptop running on battery. I contacted Roccat's support for the issue and tried everything to make sure the problem wasn't caused by any external interference. Roccat's support concluded that it was a defect so I RMAed the headset. Now I've gotten new Kave in exchange but this unit has exactly the same problem of hissing. I'm going to RMA again but I'm starting to think it's a design flaw and not just bad luck of getting two defected products in a row.

I'd like to know if anyone can confirm that there exists Kave that don't hiss at all (as perceiving hissing is subjective).