u/Cheesecake-Practical

I've bought the Alienware Pro Wireless Gaming Headset. When I enable ANC I hear this very anoying low frequency fluttery sound (It's hard to describe). It's like a rapid continues steady stream of low frequency pressure waves. Also on the left side I hear some weird noise which is a bit more audible. Does anyone recognize this? I've already updated the firmware and tested with different devices in different rooms. Unfortunately the sound doesn't go away, only when I tap the outer shell of the headset it disappears for a very short time, but then comes back right after.