Epson Moviemate 55 Dvd Lcd Projector Help With Epson MovieMate Projector Sound.?

Help with Epson MovieMate projector sound.? - epson moviemate 55 dvd lcd projector

I use an Epson Projector EMP my children for the issuance of the talent contest at school. There are approximately 150 children. I want to buy the speakers, rather than in the clay. Suggestions? It has VGA and HDMI, component, composite and S-video features and a USB port saved for viewing photos or listening to MP3 files on USB sticks. Thank you!