So last night I was messing around with Foobar2000 EQ settings and pushing the bass fairly high up and it sounded real good going from my laptop>FiiO E12>Headphones. Today when I got out of class and put them on and played a couple of the same songs from last night that sounded real good, I noticed something wasn't right. My left headphone rattles when there is a good amount of bass. Now keep in mind, I don't listen to my music BLASTING but I do like to get it fairly loud. I noticed the rattling when a bass drop hit and got into the lower frequencies. I am hoping I didn't do something wrong or that I am missing something obvious because from what I know, the titanium drivers in these things are hard to blow out.