I recently solved a problem in reusing an Anthem AVM 50 home theater processor with modern 4k/8k video standards. The solution I found was the OREI BK-927.
The basic problem is that modern TV's are great for streaming and video but use eARC for high resolution audio. eARC stands for enhanced Audio Return Channel. It's like HDMI audio, but it isn't in the sense that pre-ARC gear won't see (hear) the audio from this channel. It has to do at least with the handshaking the TV expects to know if it can send audio and what kind of audio it can send.
Your alternative of course is to use coax or optical S/PDIF from the television, with limited audio bandwidth.
While this device works very well, I'm really unhappy with the documentation provided by OREI, and the product descriptions on Amazon. There's another device which sounds like this one, by OREI which actually will not work without an already eARC enabled device in the chain. Useless for those of us without an eARC receiver/processor already.
In any event, if you are like me attempting to use a vintage receiver/procesor, here's the step-by-step instructions. Pay attention as they are not what you would expect.
1. Connect your TV's eARC ro the middle connection. It's labelled "OUT" and "TV ARC"
2. Connect your processor/receiver to the plug labelled "OUT/AMP", on the right.
3. If your receiver is 7.1 capable set the dip switches all off. Otherwise if it's 5.1 set them as 0-0-1.
4. Plug in the power adapter
5. Press the ARC button if the ARC light is off.
6. Turn the TV and receiver/processor.
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