Comment 37 for bug 344588

(In reply to comment #34)
> A lot of people still have a Realtek ALC650 sound card so please support
> multichannel for it too (for example I have a VIA KT333 chipset including it).
>
> Thank you for your growing interest.

it the application does not provide 6 channels (e.g. openal only pan the front/rear speaker to provide 3D effect and don't have any signal on Subwoofer

if you want to watch movie 5.1 or DTS , why don't you use those linux media application (e.g. mplayer or vlc )