Me again. 5.1 setup, all Axiom except for sub (SVS). Pioneer Elite receiver.

I have an issue...and this is a weird one...but whenever there is a loud gunshot type noise, instead of a gunshot sound, I will hear a very loud and distorted "whoosh" sound. It's very odd and doesn't happen often. But it's consistent on when it happens...I can basically replay the scene and the same noise will occur everytime. It's not the source because it happens on DVD's, cable tv, and my 360 (mostly during Gears of War in shotgun battles).

Could I possibly have a distorted speaker or maybe one of them has the polarity reversed?