So Im not totally sure what a blown sub sounds like but I hope I didnt blow mine and its just something else Ive over looked. I built a sub with help from these forums about a year ago and its been great since. Thursday night I was having a party at my house and bumping some loud dubstep and everything was going good and the bass sounded great then today I fire up some Revocation, a metal band with lots of double bass, and I start getting this weird noise that sounds like something is hitting something else in my sub. I did some tests with other music, more dubstep and the deep bass still sound great then every once in a while I would get the same weird hitting sound. I did some bass sweeps and it didnt sound any different. My sub is a CSS Trio 12 with a Bash 300 amp in a ported box. Please tell me my sub isnt blown, and if it is is it possible to fix it? or get it repaired or is it a lost cause now....