I use an inexpensive 16" laser level ruler (Amazon has the Emerson for $30). I simply put the ruler flat against each side of the speaker and align to a spot on the seating area (depends on toe-in, etc.) I usually toe-in to cross in front of me, so I sit a flashlight down on the front of the sofa where the center point of my listening position would be, then align the inner sidewall of each speaker to point the laser directly at the flashlight's front lens. It takes 30 seconds and, as one already pointed out, makes a SIGNIFICANT impact. The alser ruler also has an adapter that changes he point to a line source, and can be used to level (i.e lay it on the top of a level speaker, assuming the top is flat, of course). However, I simply now use a bubble level for that purpose (my Sason's have three adjustable spike points).