#1. Go to the Apple - System Preferences - Sound - Output - Choose the output that you want the sound to be heard. For example, if it's an Apple TV, select the ATV for the room in this sound setting.
#2. Sometimes when the Casio projectors lose power they will revert their audio output back to the speaker built into the projector and not the valcom/topcat speaker
- To fix this go into settings, option 2, and select “Line” instead of "speaker" (be sure to turn the volume down before you do this)