i played around with the settings and noticed that it's just the sound effects that are projected through the rear speakers - everything else is put in the front and especially the center. i also checked all the windows and AV settings...did nothing
edit: correction: only the vioces of non-companion npcs can be projected through the rear speakers if i am in the correct positions,,.the companion vioces are front only, music is also front only
edit2: and i have the banter bug...as somebody mentioned here, it seems that banters appear after switching the audio mode for a certain time
