I'm running a Sony DA4ES receiver, and one thing I can't figure out is the following. Say I have a 2 channel audio source such as the built-in Tuner or a CD. For these types of audio, I'd like the audio to come through evenly on all speakers. With this receiver, it appears that it's only able to present the audio in a 5.1 fashion where the sound dominates from the center channel and front speakers.

Does anyone know how to make the sound come evenly out of all speakers for certain types of audio sources?