I have read where using an equalizer on a passive subwoofer can help with some of the "boomy" sound that comes from subwoofer location. This makes sense but what I don't understand is how an equalizer with a 20hz-20kz range would do any good for an LFE channel that is 20-100 hz or so. It seems like only the lowest settings of the equalizer would have any effect on the the sound and the remaining higher frequency settings would be wasted? Can someone shed some light on this?