We claim the ornamental design for a speaker, as shown and described.
FIG. 1 is a front perspective view of a speaker showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left-side view thereof;
FIG. 5 is a right-side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is a rear perspective view thereof;
FIG. 9 is another left-side view thereof, in which the speaker is provided in an example environment; and,
FIG. 10 is an enlarged view of the portion 10 encircled in FIG. 8.
The broken lines illustrating portions of the speaker are for environmental purposes only and form no part of the claimed design.
The dot-dash broken lines encircling portions of the claimed design that are illustrated in enlargements form no part of the claimed design.
The dot-dot-dash broken lines illustrating portions of wall and floor in FIG. 9 are for environmental purposes only and form no part of the claimed design.