I know speaker placement is very important and an inch here or there can make a difference so I was wondering where to even start before I do the adjustment process. I Right now I have a 16x21 room with a large entertainment cabinet that houses the receiver and a big screen in the middle of one side of the 21 ft wall. My couch is in middle on the opposite 21 ft wall. Right now the back of my speakers are about 6" away from the wall and the sides of the speakers are about 5ft. from either side wall. This places them about 10 ft apart. I do not have them toed in because they are right next to the entertainment center cabinet. How close am I to the optimum position?