The ornamental design for a combined headrest and seat speaker, as shown and described.
FIG. 1 is a front elevational view of a combined head rest and seat speaker showing our new design;
FIG. 2 is a right side elevational view thereof, a left side elevational view being a mirror image;
FIG. 3 is a partially enlarged cross sectional front elevational view thereof cut along the line 3-3 of FIG. 1 and along the lines 3-3 and 3 ′-3 ′of FIG. 2;
FIG. 4 is a partially enlarged cross sectional left side elevational view thereof cut along the line 4-4 of FIG. 1 and along the lines 4-4 and 4 ′-4 ′of FIG. 2;
FIG. 5 is a further partially enlarged cross sectional front elevational view thereof at the portion 5 of FIG. 3;
FIG. 6 is a further partially enlarged left side elevational view thereof at the portion 6 of FIG. 4;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a cross sectional left side elevational view thereof cut along the line 8-8 of FIG. 5; and,
FIG. 9 is a cross sectional right side elevational view thereof cut along the line 9-9 of FIG. 5.
The broken lines illustrating portions of a seat and a head rest of an automobile form no part of the claimed design. The dot-dash broken lines defining boundaries of the claimed design form no part of the claimed design.