Have you inspected your wire for any damages? A droning, buzzing sound usually comes from some kind of damage in the line, like a crossed wire or something of the like. Is the rubber on the headset damaged? If you've been through many controllers and
it still manages to make this sound, it is leading me to believe that your Headset is to blame (and that is a nice piece too, hopefully it isn't broken).
A lot of damage always seems to come at the connection end or the end nearest the actual headphones because those are the least flexible and always end up severing somewhere around that part. Usually it'll just stop working but if the wires create a current
through the wire that isn't broken, you'll end up with electrical interference and that will cause a scratchy noise when talking if it still works, or a flat out, annoying, buzzing sound. The same works with Ethernet cables, but I digress. Have you tried
using another Mic to see if the issue persists?
If your controller is vibrating and it's causing your mic to buzz, you might have a bad wire in the connection part and every time it rumbles, it may be very quickly and constantly touching and then not touching. Does the buzzing go away if it stops rumbling?
Or is it there all the time?
-Akuzimo