My home theater setup diagram

flowchart LR

    subgraph Media Closet
        subgraph Denon AVR X1700H
            AVR_HDMI1
            AVR_HDMI2
            AVR_HDMI3
            AVR_HDMI4
            AVR_HDMI5
            AVR_HDMI6
            AVR_HDMI_OUT

            Speakers_OUT
            Sub_OUT1
            Sub_OUT2
        end

        Nintendo_Switch --> AVR_HDMI1
        Apple_TV --> AVR_HDMI2
        PC --> AVR_HDMI4
        Xbox --> AVR_HDMI5
        PS5 --> AVR_HDMI6

    end

    subgraph Living Room

        subgraph Samsung S95B TV
            TV_HDMI1
            TV_HDMI2
            TV_HDMI3_eARC
            TV_HDMI4
        end

        subgraph Hue Play HDMI Sync Box
            HUE_HDMI_OUT
            HUE_HDMI1
            HUE_HDMI2
            HUE_HDMI3
            HUE_HDMI4
        end

        subgraph 7.2 Surround Sound
            In_Wall_Speakers
            In_Wall_Sub1
            In_Wall_Sub2
            Under_Couch_Sub
        end

        subgraph EZCOO HDMI 2.1 Splitter
            HDMI_2.1_IN
            HDMI_2.1_OUT
            HDMI_2.0_OUT
        end    

        HDMI_2.1_OUT --> TV_HDMI1
        HDMI_2.0_OUT --> HUE_HDMI2

        HUE_HDMI_OUT --> TV_HDMI2
    end
    
    AVR_HDMI_OUT --> HDMI_2.1_IN

    Speakers_OUT --> In_Wall_Speakers

    Sub_OUT1 --> In_Wall_Sub1
    Sub_OUT1 --> In_Wall_Sub2

    Sub_OUT2 -. Wireless .-> Under_Couch_Sub

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The Hue sync box outputs to TV's HDMI 2 input only to make it happy that the signal is ending up somewhere

If I don't do this the sync stops every time there's a signal change (input change or HDR on/off). My TV is on HDMI 1 permanently.

No Dolby Vision because Samsung TV

I use HDMI 2 input on the Hue Sync Box because that's the Dolby Vision port and potentially (?) has higher bandwidth...? But it doesn't actually matter since the sync works on all ports. Might be different for Dolby Vision user who should stick with HDMI 2.

This system might look like a lot but everything hidden

The receiver and all inputs are in the media closet (pictured). The HDMI and speaker cables are in conduits under the floor and in the walls.

The HDMI splitter, sync box, and other things like the Hue hub (not diagrammed) as well the power supplies are hidden behind the TV.