Tom, the sequence of measurements isn't important, but there's no need to try to include alternate listening positions as measurement points. As Brian mentions, it's suggested that the successive measurements(use as many as possible)be only a foot or two from each other. These small differences nevertheless give more data points for Audyssey to work with to create a picture of room variations. Even a listening position somewhat outside the measuring points would benefit.

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Enjoy the music, not the equipment.