Pioneer XY series Installation Manual page 13

3 Rigging And Caster Setting
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(4) Lift the waveguide up and rotate it 90 degrees to change the dispersion
orientation depending on the orientation of the enclosure. When the HF
waveguide is rotated back to the original orientation, ensure it is rotated
in the reverse direction when it was first rotated. (Fig.3-1-2-C)
Reinstate the bolts and retighten. Avoid over tightening as this may crack
(5)
the waveguide.
(6) Reinstate the grille by gently placing it in place over the front of the
loudspeaker.
(7) Reinstate the bolts to secure it in place.
Fig.3-1-2-C