Hi,I live in a semi detatched house ,with neighbours who are semi retired.I like my music quite loud ,normally about 11 oclock on the dial .but if I turn it up above the 9 oclock mark the neighbours complain about the bass noise going through their living room wall .my speakers sit near both corners of the room .about 2 foot away from the side walls and 1 foot from the rear wall ,toed in slightly.I am seriously considering building. Sandbags in an L shape around my speakers to the same height as them and coming out level to the side of them .would this dampen the sound reverberating through next doors walls or would I have to do the whole wall.(which is obviously a no go with the missus ) .any advise would be welcome.thanks!