I've had the Nu Audio card since it launched and have been using ATH-AG1X's and the microphone is prone to clipping when I normally speak.
I came from an Creative Sound Blaster Z where the sensitivity was fine and I could transmit the microphone under windows and the card at 100% volume now I have to transmit at 50% to just keep the any peaking I create from bothering anyone I'm talking to. In terms of the GUI we have for the card, I need a negative level of "Mic Boost". The volume ring is not the same as gain. That is just the maximum output volume.
I find it hard to believe that the headset I'm using is at fault as it's on the "Certified" list and I've actually used two pairs of the same device since purchasing this card.
I'm including an updated version using the latest drivers of a video I made for EVGATech_LeeM when I first brought up the issue.
https://www.youtube.com/watch?v=siGOVX9JBFA Please let me know if you have experienced similar issues.