US D645445 S1
The ornamental design for a headphone assembly, as shown and described.
FIG. 1 is a perspective view of a headphone assembly showing my new design.
FIG. 2 is a bottom perspective view thereof.
FIG. 3 is a left side view thereof.
FIG. 4 is a right side view thereof.
FIG. 5 is a front view thereof.
FIG. 6 is a rear view thereof; and,
FIG. 7 is a top view thereof.
Portions of the drawings shown in dashed line are for illustrative purposes only, and form no part of the claimed design.