The ornamental design for a speaker, as shown and described.
FIG. 1 is a top, front and side perspective view of a speaker showing a first embodiment of my new design, the speaker having an electroacoustic converter film capable of being drawn out of a housing tube;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a left side elevational view thereof;
FIG. 7 is a right side elevational view thereof;
FIG. 8 is a top, front and side perspective view thereof in which the electroacoustic converter film is in a state of being wound;
FIG. 9 is a top, front and side perspective view thereof in a manner of use in which the speaker is attached with legs so as to raise itself up; and,
FIG. 10 is a top, front and side perspective view of a speaker showing a second embodiment of my new design in which an organic EL display is secured on an electroacoustic converter film.
The broken lines shown are included for the purpose of illustrating portions of the speaker that form no part of the claim.