FIG. 1 is a front and right isometric view of a stereo loudspeaker showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken line showing on the drawing disclosure is for illustrative purposes only and forms no part of the claimed design.