Sonos Arc (Dolby Atmos) with 4K Projector vs. TV

Nope. Passthrough just means it can forward audio on the normal audio channel. ARC isn't even mentioned, and that is what is needed.

We need a switch that can do what a TV does - take the incoming audio channel on one HDMI-IN, and return it over ARC on another HDMI-IN, to which the Arc is connected. So far, there is no such thing.

Lovely.  I just got notice that my ARC has shipped.  Doesn't look like I’m going to get the upgrade over the playbar, I’m currently using, that I was hoping for.  

Would something like this not work? It’s not technically splitting the audio from the video signal, but if you sent the regular hdmi out to the projector and the ARC hdmi out to the soundbar would that not work to get an atmos audio signal to the soundbar and an image to the projector?

https://www.amazon.com/NEWCARE-HDMI-Matrix-Switch-Splitter/dp/B07ZNKF7C8/ref=sr_1_11?dchild=1&keywords=hdmi%2Baudio%2Bvideo%2Bsplitter%2Barc%2Bdolby%2Batmos&qid=1591905756&s=electronics&sr=1-11&th=1

It doesn’t create the ARC Or eARC signal, it just passes the one created by the TV. 

I’ll take a look at it.  By way of an update - new ARC speaker arrived yesterday and I can’t get it to work even using the hdmi to TOSLINK (optical) adapter they include in the box.  Makes no sense.  My prior setup was an HDMI in, to an optical and hdmi out splitter (hdmi going to projector and optical to playbar).  Not sure why it wont work now when all I did was add the adapter to the optical out.  Frustrating!

newbie here but been looking to hook up 4k ultra short throw projector with the new Sonos ARC to achieve atmos.  Projectors like the Vava 4k (https://www.vava.com/products/4k-ultra-short-throw-laser-projector-1) and Optoma P1 (https://www.optoma.co.uk/product-details/uhz65ust) have eARC HDMI connections. 

Would these not allow for Atmos pass through say from an Apple TV 4k box > into the projector > and then into the Sonos ARC?  I’ve seen the Vava website says it doesn’t support ATMOS but it’s not clear if that refers to the native built-in HK soundbar vs passthrough via eARC…

I have both a LG OLED TV and the LG HU80ka Projector and have been doing tests over the weekend.

The TV is amazing. Everything worked on Atmos, the sound is amazing and you are able to watch it with light during the day.

The Projector is were I enjoy the movies the most. 120”, and very good quiality if there is no light in the room. Regarding Atmos, from the FireStick I get Atmos on DIsney Plus, Tidal and Prime. Not on Netflix or AppleTV. There are 2 possible workarounds for Netfix. Buying the Cube form Amazon or installing Kodi and the add-on on the Fire Stick. The AppleTv does not detect immersive sound so all I can get from it is 5.1

Hope this helps.

Glad I found this thread - was just about to click buy on an Arc.  From what I’ve read above I can’t get Atmos - is this correct?

Current set up is:

Devices into a 4x2 Matrix.

Matrix HDMI 1 out to 4k projector.

Optical out to Sonos Playbar.

The matrix has a second HDMI out so I thought I’d be able to pump that into the Arc HDMI, but from what I now understand this won’t work as it doesn’t carry eARC.

Is this correct?  Thanks

Regarding the HDMI,Is it regular ARC or no ARC at all?

HDMI switches don’t currently create either ARC or eARC signals. They do split off an optical signal from an HDMI input. But that is maxed out at Dolby Digital (5.1) due to bandwidth on optical. 

There is a device being worked on to create eARC signals, being discussed here, but it isn’t to market yet. 

Any HDMI switch with an optical output must be fed a Dolby Digital signal to work with Sonos. They can’t transcode a DTS, Dolby Digital Plus, or Atmos signal.