I think I know what chuffing is because the word sounds like the noise made by my x-sub during some loud, low frequency scenes in certain films. Is this caused by volume or my frequencies lower then my sub can handle? Or is it a combination of both? Can this be remedied? My room size is in excess of 2500 cu ft and is open to another room. It's not a great room for sound, but it's what I am stuck with. Any suggestions on how to curb this noise?