I ended up buying a pair of Rowland/Cakewalk MA-15D studio monitors for $179. The Cakewalk monitors have toslink and coax inputs and analog inputs via standard RCA connectors. For our first movie night I connected the projector using the headphone analog outputs as suggested by Edo. They sounded GREAT! I got several comments from movie-goers that the sound was great for an outdoor movie. Also, the inflatable (think bouncy house) move screen frame worked great and it is huge!
So, the Epson Movie Mate 60, inflatable screen frame w/screen and the Cakewalk monitors combine for an excellent outdoor movie experience.
So, the Epson Movie Mate 60, inflatable screen frame w/screen and the Cakewalk monitors combine for an excellent outdoor movie experience.