The ornamental design of a soundmodifyingattachmentdisk for loudspeakers, as shown and described.
FIG. 1 is a perspective view of the sound modifying attachment disk for
loudspeakers of my design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof; and,
FIG. 4 is a side elevational view thereof, the broken line showing of the
speaker is for illustrative purposes only, and forms no part of the
claimed design.