The ornamental design for speaker box with removable grill, as shown and described.
FIG. 1 is a front, top and right side perspective view of speaker box with
removable grill showing my new design, with the grill mounted to the front
thereof;
FIG. 2 is a rear, bottom and left side perspective view; and
FIG. 3 is an exploded perspective view with the grill removed from the
front of the speaker box.