If you have an iPhone/Pad, you might try this:
"Leverage the camera on your iPhone or iPad to measure rooms and generate accurate floor plans in just a few minutes."
Are there large openings that lead to other areas? Please post a sketch of your room including adjoining rooms if linked via permanent openings. Indicate where you can put the subwoofer. Sounds like you are sitting close to the middle of a square room, not good for deep bass.
Room layout.doc 396k . file
Can you include the dining room in your sketch? What I need are the dimensions of the adjoining room. Does not matter that the entryways are not huge. Bass will energize the dining room. Is you sketch to scale?
Room Layout2.doc 186k . file