hello everyone!
i've found a thread from someone with the same problem but it's 6 months old and directs the user to technical support.
so i made this one for people with the same problem as me and hopefully it comes up in search results.
i just got this headset to replace my old Vengeance 2000 and from day 1 i had a constant noise coming from the headset.
it's only noticeable when no sound is playing.
today i finally found a solution!
i went into iCue and disabed the Sidetone slider and the noise is gone!
Sidetone is the option the hear what the mic is capturing. in my case i don't even have the mic plugged in so it was just sending static noise to the headset.
i don't know if this is fault or just how it works but i hope this helps other with the same problem!
TL;DR: Go to HS70 settings in iCue and disable Sidetone slider
