yeah, i know treatment doesnt have to be permanent. for me, right now, there is little i can do. one side has a sliding glass door, and the other is 95% open (into a dining room). oh and we have 1 story crawl space below the room (on a hill). i will be moving soon enough.

i do not care for the look of most acoustical treatments, that is why i mentioned the sheetrock. it would be pretty much invisible. same goes for the false wall approach.