Wisdom Audio Series S90i - Manual (Page 23)

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9. Once the snorkel is wrapped, and the S90is is in place with the band
clamps snugged down, screw the S90i into the studs to anchor it firmly
in place.
Screw only through the wooden flange that extends around the edge of
the face of the S90i. Fasteners should not be driven into the S90i else-
where, as there are locations in which doing so could cause permanent
damage and/or compromise its performance.
10. Finally, attach the HVAC grille by screwing it in place. The screws used
on this grille will extend into the ceiling flange’s wooden plate, making
an extremely secure cover.