I'd like to have audio simultaneously going from an Arris DCX-3600 to HDMI (to my AV receiver and connected TV and speakers) and to S/PDIF (to a sound bar I'd like to get). There is a setting in the Arris manual suggesting this is possible, but I'd like some confirmation that it actually can do this. Thanks!
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Your TV is probably the only device that could adjust the delay. Better sets also have optical out and it's correctly timed with the video.
I haven't seen any soundbars that could. Try the cable box, perhaps the arris will work.