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mike, this is a simple laser pen one sees all the time. HTF admin Bob McElfresh likes this method and has a number of posts here.
In essense, the laser is lightly taped to the top of the L then R main spkr, and one has three choices to work with:
1. The beam intersects exactly where your ears sit in the chair,
2. One foot behind this spot, and
3. One foot in front.
If one has another person in the sofa, then focusing behind the couch tends to widen the sweet spot, but this can be a fragile compromise by collapsing.
Depending on one's spkrs, and room characteristics, one shoots for the best imaging while playing a DVD or CD in two-chl mode to achieve that phantom center. Afterward, the CC takes up the work in 5.1 tracks.
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