TV audio issue (not home theater)

[romac]

I have a 47inch Philips LCD that I bought a few months ago and I love it, however, I've noticed a weird audio issue. Occasionally when I'm watching a movie or playing a game and something happens that involves a lot of bass, I hear a crackle or something from the speaker. I really don't think it's just a flat out busted speaker because it's hard to replicate and it's not that nasty buzz sound that a blown one has, just a weird crackle. It happens when say, I'm playing Forza and I run over a rumble strip on the track, or in the occasional song or explosion during a movie.

Could this be something in my audio settings? I looked at the equalizer thing and I seriously might as well be looking at a foreign language..but could this have anything to do with it? I really hope my speakers not blown but I don't know what to adjust to be 100% sure.