In the past, I have aligned speakers to my sitting position by angling them a tiny bit at a time until I had the desired effect to suit my notion of imaging etc. However, when SWMBO vacuums the room, she moves my speakers, so the process repeats itself ad infinitum. Quite frustrating.

To get within 95% of my preferred listening angle scientifically, I came upon the idea of using a laser presentation pointer. I blu tak the pointer on the middle top of my speaker cabinet, put a piece of paper on the top of my listening chair/couch and note the laser position. Repeat for the other speaker until they are both on the same spot or the amount of cross axis. I can now physically adjust the speakers by small increments in a matter of seconds to fine tune the image.