[hobie1dog]

unless you have a stereo room that is a completely dedicated room with nothing else in it then you're listening position is only at a very small spot. It is not going to be very far to the left or to the right. You're going to be sitting close to the centerline of the room between the two speakers and if it is in a standard living part of your house then you are very limited on where these pieces of furniture( yes speakers are nothing more than pieces of furniture that have to be positioned in the room to coincide with all of the other pieces of furniture). They are only going to go so far on either side of the fireplace, on either side of a doorway or patio doors. bathroom doors, closets, as there isn't a whole lot of flexibility to where the speakers are actually going to go because of the floor space and the other pieces of furniture like couches and tables etc., in the room. Most working-class Americans who live in regular sized homes usually do not have large dedicated listening rooms that allow you to have your speakers 6 ft away from the front wall as an example when your room is only 14 to 15 ft deep. same thing for positioning your speakers left and right in your room if your room is only 14 ft wide and you have a stereo rack in the middle or a TV then you're not going to be able to have a large amount of options for putting the speakers left to right.
For sub positioning, again somewhat determined by your limited options if it is in a living part of the house, the easiest way is to put the sub on a small movers Dolly and while you listen have somebody move the subwoofer but simply pushing it along the floor /carpet while you listen to the spots where it will fit.