Welcome to IRv2. If you don't get an answer here, also try the TiffinRVNetwork.com website (Tiffin owners and can answer almost any question you may have).
The answer here somewhat depends on the home theater system Tiffin installed in your coach. If you have a Panasonic system, you set the HTS to D-In (digital in), turn central TV volume to zero, and control the sound via HTS volume control. I don't know about the other manufacturers Tiffin has used, sorry.
Tiffin uses the Digital Sound Out option on the center TV (and these vary between manufacturers) to the Digital Sound in port on the HTS. You should be able to find those on other makes of equipment and figure it out.
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Roger & Mary
2017 Winnebago Navion 24V (Sold)
2014 Tiffin Phaeton 36GH (Sold)
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