I bought a Turtle Beach X12 headset a couple months ago and I was using it with the AstroMixamp. But one day it started making a high pitched noise and just stopped working all together. I thought it was my mixamp, but I tried other headsets with the MixAmp and they worked out fine. So I was wondering, I have my MixAmp powered by my laptop which always has the charger plugged in. Then I had my Turtle Beaches plugged into my laptop also because it's USB powered. So do you think that there was too much voltage going to the headset which caused them to short out? Should I just power my mixamp and turtle beach headset from two different sources? I'm almost certain that there was too much voltage circulating. What do you think?