I have a room that is about 19' long x 17' wide x about 10 1/2ft tall. Concrete floor under carpet. Flat walls. I have 3 subs. 2 are the same 1 is same brand but larger and more powerful.

I have my viewing area at one end of the room and I sit at the other end. I am having problems finding the sweet spot for my subs, so that they deliver good sound throughout the whole room.

I have this diagram of an idea. What you think?...I know its more straight at me but would this make the sound full through the whole room or am I going to just have to do "trial and error?"
http://i42.photobucket.com/albums/e312/mikieson71/subplacement.jpg

Why 3 subs? Why not 2? Or 1? Seems overkill, imho.

Why 3 subs? Why not 2? Or 1? Seems overkill, imho.
Cause I have them and they are new.AND personally , you can NOT have overkill on bass.
Anyone else have some input on placement??