DISTANCE
1. Set your speakers against the wall and turn them inward so that the drivers point directly at your ears. Tweeters should be in the same horizontal plane as your eardrum. Adjust your stand to achieve the proper height.
2. Have a listen.
3. Move them towards your listening position by a foot.
4. Have a listen. Notice anything different?
5. Try moving them another foot towards you. Still different? Adjust in smaller steps until the front/back arrangement sounds best.
SOUNDSTAGE
6. Next we will play with the horizontal distance. The ideal angle usually lies between 60 and 72 degrees as measured from your listening position. Measure it out if you want, or better yet just play it by ear. The wider the distance, the bigger the soundstage. If they get too far apart, the soundstage will become too thin and hollow-sounding. Move them closer or farther apart until the widest possible soundstage is achieved without compromise.
BALANCE
7. Set your amp/preamp balance (if you have one) to center. Sit in your listening position. Is the image balanced in the center of both speakers, or does it hang slightly to the left or right? If it isn't centered, move the offending speaker back an inch or two until the image is properly centered.
FOCUS
8. Having a friend help with this task makes it a lot easier. Sit in your listening position and play some music. Up to now, the drivers have been pointing directly at your ears. Have a friend slowly turn one speaker as you continue to listen. There will be a point where the transients have the greatest *snap* and clarity... so have your friend STOP when you are "in the zone". Do the same for the other speaker.
Voila! 3x better speakers for free!
Speaker placement set me back a whole week. Lowther speakers are notoriously fussy. They ended up practically in the middle of the room, about six feet apart (near the 72 degree mark). Rather than pointing directly towards my ears, the drivers were rotated until they converged at a point about three feet behind my head.