I didn't think it was likely either until I had the problem and learned all about users having this same issue. In my case I was trying to get rid of a buzzing sound which was occurring only on certain mid-bass frequencies on the right side. It is a common thing among Grado/Alessandro phones and even the term "grattle" has been coined because of it. There is a lot of information about this on the web with a quick search.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne