| 
 | The ornamental design for a sub woofer, as shown and described.             | |||||||||||||||||
FIG. 1 is an isometric view of a sub woofer showing my new design;
FIG. 2 is a rear view;
FIG. 3 is a front view;
FIG. 4 is a right side view;
FIG. 5 is a left side view;
FIG. 6 is a top view; and,
FIG. 7 is a bottom view.
FIGS. 4 and 5 are on a reduced scale.
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