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I have this device from CORSAHD: 

https://a.co/d/5o6AZir

It works great with my bedroom LG TV that does not have eArc and my Sonos Arc. It also has four HDMI In ports so you don’t need a separate splitter like you do with the Arcana. Lossless Dolby Atmos passes to the Arc just fine. The one issue I’m having is with any DTS-HD track. It converts every DTS-HD track to lossy DTS Surround. DTS-HD 2.0 becomes DTS Surround 2.0. DTS-HD 5.1 and 7.1 both become DTS Surround 5.1. When I tried changing my Blu-ray player from Auto to PCM, I just got stereo PCM for DTS-HD 5.1 and 7.1 tracks. I can’t find a way to get Multichannel PCM 7.1 like I can when using TV with eArc. I don’t think changing any settings on the TV should matter because I’m sending the audio directly to the Sonos Arc. The CORSAHD device should just be passing through audio, so I’m not sure why I would not get Multichannel PCM. Any ideas? 

I was able to resolve this. I’m using a Sony UBP X-700 Blu-ray player. I had to change the digital audio output from auto to PCM. Then I had to change the CORSAHD device from “copy” which was passing through the audio to Atmos/7.1 content which made it multichannel PCM 7.1 for a DTS-HD 7.1 track.
 

Previously when the Blu-ray player was set to auto, flipping the switch to Atmos/7.1 gave me an unsupported audio notification in the Sonos app and no sound. After switching the Blu-ray player to PCM, I was only getting stereo PCM when leaving CORSAHD as “copy”/passthrough. I had to activate the Atmos/7.1 switch to get multichannel PCM 7.1. Hopefully I’m actually getting 7.1 and not some kind of upscale of stereo PCM, but it sounds accurate on my surround speakers. 
 

So overall, this CORSAHD device gives you everything Arcana can do at a fraction of the price and even includes multiple HDMI In ports that Arcana does not. However, it does require some settings changes to toggle bewteen Atmos, DTS-HD surround and stereo, but I’m willing to live with that. I have a 2017 LG TV in my bedroom without eArc which required this. I expect all TVs to have eArc going forward, so I suppose this information will be useful to some people for a little bit of time until the necessity of Arcana/CORSAHD becomes obsolete. 

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