DAE have the ability to engage a muscle in their inner-ear that creates an audible rumble?

I've always wondered this. So I can move my ears, but this is different. I have always been able to engage some sort of muscle in my inner ears that creates this sort of low, loud rumble while I'm doing it. I've never met anyone else who can, figured this is a good way to find out. And if you can, do you know what the hell that is and why we can do it???