I have a Yammie 5760. Front speakers in entertainment center placed on front wall, center on top of TV, surrounds in left and right corners of back wall and sub in left corner of front wall. Couch in center of right side wall and chairs in left and right of back wall. There is no seating in the middle of the room. Room is 16 X 18. Where should I place the MIC? In the middle of the room, even though there is no seating in the middle of the room? Thanks for your help.