The ornamental design for a multi-tone audio speaker cover, as shown and described.
FIG. 1 is a perspective view of a multi-tone audio speaker cover;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a front elevational view thereof; and,
FIG. 7 is a rear elevational view thereof.
The stippled shading between the central region and the peripheral region of the multi-tone audio speaker cover is understood to represent contrasts in color appearance and form part of the claimed design.
The broken lines in FIGS. 1-7 depict portions of the multi-tone audio speaker cover in which the design is embodied that form no part of the claimed design.