In MP, against certain opponents, I get terrible feedback coming from my speakers. It's just a bunch of static, but it prevents me from ever actually hearing the game because it is so loud. I can't disable it in the volume control, either, even if I turn all game effects including voice to zero. Not sure what's going in.

is it temporary? it happens to me too, static, then goes away

I think your enemy/ally is trying to talk to you using his voice.

During the game? In combat? Man, he's not only talking to me, he's also multitasking his units on the fly!