Hi, I've just got the Razer Carcharias from my birthday, Brilliant Headset! I was in a call with my friend and he could hear all the videos I was watching on Youtube. I think it's an over sensitive Mic. I was unable to reduce the microphone boost on the sound card I had, It only had a tick box.
So if anyone has a solution for the problem, or a new sound card that has an adjustable microphone boost please tell me!