I'm sure this has been asked before, but what causes speakers to go what one can only describe as a "farty" sound? The speakers are FLI 220w, theyre a direct fit into my old rears in my Bravo, the screws are tight and theres no breaks in the rubber or surface, no dirt etc but it still farts like mad (have a good laugh if you want ) Ive noticed its only at certain frequencies, a loud and bassy track may not bother it, but lower the volume when its over and voices and ads drive it mad! And its driving me mad!!! :bang: