LT72884
Head Chef
this is how i do it. HDMI from cable box/HD device to AV receiver(sound system) then HDMI cable from AV receiver to tv. The av receiver strips the sound data from the HDMI cable and then passes the HD video data to the tv.
I just keep the volume all the way down on the TV and run seperate Line Outs from whatever component to the receiver.
I'm using optical.