"The goal of all speaker placement for movie soundtrack playback and multichannel music reproduction -- even stereo -- is a smooth, consistent and unbroken soundstage across the front, coupled with a sense of envelopment in the ambient surround effects. In other words, you're after a sense of location, whether that is suggested by what's on-screen, by the recording venue or even the dry, intimate acoustic of many pop/rock studio recordings."
Ready to perfect the speaker placement in your home theater? Well get your protractor ready and check out this article.