Pioneer PDP-502MX Manual page 37

Methods of Securing: Basic methods of securing are shown below. Avoid blocking or covering areas aside from those
indicated by
Before attaching the unit to fittings, double-check that the thickness and height of the fittings,
and the number of fixing bolts is correct.
(Also refer to 3.4.1 "Mounting to fittings".)
Vertical suspension
Special Installation (Ceiling suspension (with wires))
. The methods indicated by a large X-mark must not be used.
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