Hi, I currently have the Sennheiser PC 360 headset, which I've been very happy with, but it's open back and now I need something that is better able to block out the high pitched noises that a cockatiel can make. As far as I can understand from googling around, noise cancelling doesn't do much for high pitched noises, it works better with low constant sounds. So my question is, is a closed back headset actually going to make much of a difference in blocking out a noisy cockatiel, or should I just stick with my open backed headset?