FIG. 1 is a perspective view of a speaker showing my new design. FIG. 2 is a front elevational view thereof. FIG. 3 is a rear elevational view thereof. FIG. 4 is a left side elevational view thereof. FIG. 5 is a right side elevational view thereof. FIG. 6 is a top plan view thereof. FIG. 7 is a bottom plan view thereof; and, FIG. 8 is a cross-sectional type of view of the speaker, corresponding to 8-8 of FIG. 2.