The ornamental design for combination stereo speaker system and carrying case for a portableaudiodevice, as shown and described.
FIG. 1 is a front elevation view of the combination stereo speaker system and carrying case for a portable audio device of the invention;
FIG. 2 is a rear elevation view thereof;
FIG. 3 is a left-side elevation view thereof;
FIG. 4 is a right-side elevation view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a perspective view thereof;
FIG. 8 is a perspective view thereof; and,
FIG. 9 is a perspective view thereof, with the case in an open condition.
The broken line showing of a portable audio device and a cable connection thereto on FIGS. 8 and 9, is included for the purpose of illustration only and forms no part of the claimed design.