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Q I wish to place center-channel speakers above and below my projection screen. I know the distance from the two speakers to the seating position at ear level will not be the same, and I would like to know how to calibrate or compensate for this difference. I have a 5.1 surround setup with an Oppo BDP-105 Blu-ray player, a six-channel amp, and a powered sub. I am patient enough to do the onscreen setup from the Oppo, but I’m at a loss over the dual center speaker issue. Dale Kay / via e-mail