I am currently in the process of wrapping up construction of the 2x4 walls in my basement - soon to be home theater, but have a conflict of interest. Other members of my household want the room to be one big open space, (multipurpose room) while I intend to set it up in the best acoustical configuration. Unfortunately, I will have little choice but to build the room in a relatively symmetrical L-shape. (Attached is the floor plan) At this point, what would be my best option in terms of 5.1 reproduction without having all of the sound float into empty space on the left side? I have considered dividing the room with some kind of sound absorbing/reflecting material such as these: http://www.audimutesoundproofing.com/soundproof-wall-sound-deadening-insulation.aspx?&utm_source=google&utm_medium=cpc&gclid=Cj0KEQiAzsvEBRDEluzk96e4rqABEiQAezEOoME8ins-jdGEP9paV6mxzcSFI48VY52FEwM7yIz2w5saAgU38P8HAQ http://www.audimutesoundproofing.com/sound-proofing-materials-acoustic-curtains-band-rehearsal-space.aspx?&utm_source=google&utm_medium=cpc&gclid=Cj0KEQiAzsvEBRDEluzk96e4rqABEiQAezEOoCgkBcR3PKzpitN66mCdb4fo2TcJb8YgwQHG-wmxQ9YaArSK8P8HAQ I realize that if I closed off the room with one of these to form a rectangle that I would need to put the same material on the other side to provide symmetry. Would this really be a good option? It certainly wouldn't be perfect, as the material does not have the same density of the 2x4 stud wall on the other side of the room, but would it be better than nothing/sound treating the open space of the room? Is there another option that I am overlooking that could provide me with a temporary wall that could be taken down and put back up with relative ease?