iChat AV: Only right speaker makes sound during audio or video chats
Products Affected
iSight, Mac OS X 10.4, Mac OS X 10.3, Mac OS X 10.2, iChat
PowerBook G4, iBook, and MacBook Pro computers only make sound through the right speaker, and the volume may seem lower. This prevents feedback through the built-in microphone. This document applies to iChat AV, Mac OS X 10.2.5 or later, and iSight or any FireWire IIDC compatible video camera.
To hear sound from both channels, use headphones or external speakers (such as USB speakers).