I assume that with the OP1 having Dolby and DTS, you do not need a separate receiver, that you connect your source appliances to your HDTV and then connect the TV's HDMI output the OSB-1, with volume and the like being handled by the TV remote, is that correct?

If so this sounds like great setup for bedrooms.
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Living Room 24x18 open 1/2 flight up to a raised dining room/hall 24x12
Outlaw 976 pre-pro running 5.1 system
Outlaw 750 for Artison Masterpiece LCR and 2 NHT SuperZeros rears
Velodyne Servo FX-1200
LG OLED65C8PUA via HDMI2 to/from 976 HDMI ARC
Roku Ultra
Samsung BD-D5500 BluRay
Amazon FireStick 4K to 976 Aux HDMI input for Amazon Music Ultra