The ornamental design for an acousticalspeaker, as shown and described.
FIG. 1 illustrates a perspective view of an acoustical speaker;
FIG. 2 illustrates a right side view of the acoustical speaker;
FIG. 3 illustrates a left side view of the acoustical speaker;
FIG. 4 illustrates a front view of the acoustical speaker;
FIG. 5 illustrates a rear view of the acoustical speaker;
FIG. 6 illustrates a top view of the acoustical speaker;
FIG. 7 illustrates a bottom view of the acoustical speaker;
FIG. 8 illustrates a bottom and rear view of the acoustical speaker; and,
FIG. 9 illustrates a perspective view of another embodiment of the acoustical speaker.
The broken lines showing various internal and external acoustical speaker elements are for illustrative purposes only and form no part of the claimed design.