Pioneer PDP-501MX Technical Manual page 20

Installation Conditions
This unit is designed to be mounted using four bolt holes. For additional safety, we recommend securing it at six to
eight points on opposite sides of the horizontal and vertical center lines, as shown in the illustration below. Do not
secure the unit at four points arranged in a single row, as shown below.
Methods for securing — Unfavorable examples
Methods for securing — Favorable examples
A. Secured at eight points
C. Secured at four points
(with mounting hardware attached to the sides)
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B. Secured at six points