If the center channel is below the screen, thus below the mains, can the axis be the same for all three? I have axis -1 for mains so the image projects down. Can the center be set to +1 to project up to the screen? How should this be set-up? Thanks.

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861v4.8, HD621, DSP8000's, DSP5000HC, 4x DSP5000 mkIII, D2500.