Loudspeaker

FIG. 1 is a top, front perspective view of a loudspeaker showing the new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear elevational view thereof; FIG. 4 is a side elevational view thereof; FIG. 5 is an opposite side elevational view thereof; FIG. 6 is a top view thereof; and, FIG. 7 is a bottom view thereof. The evenly-spaced broken lines in the figures illustrate portions of the loudspeaker that form no part of the claimed design. The dash-dot broken lines in the figures represent the boundaries of the claimed design and form no part of the claimed design.