I have been working with a friend who recently moved and his new system room is a nightmare. There are exposed rafters in the ceiling, a huge opening on one side going into an adjacent room that echoes. The other side has openings between columns going into another . We have been testing with acoustic panel placements, hanging shipping blankets. stuffing different material between the rafters and moving furniture. Still a work in progress. This one is not easy, but with the level of his equipment and speakers, it deserves to be heard at its best.