Thanks to the Forum,Finally I have my ALC888(GA-965P-DS3) worked at 5.1 surround. thumbsup_anim.gif
I can hear sound through each channel.



But which player can give me 5.1ch sound on playing my MKV files? I've tried MPlayer OSX Extended and Plex. Change the output device to the Aggregate Device, but it also gives 2.1ch sound. When selected DTS, AC3 Pass-through I only hear noise from the speaker. wacko.gif