The problem is that most older TVs can output 5.1 audio via optical out from the TV itself only. This means from the internal Digital Tuner and Smart TV Apps that support it. Any external device you connect to the TV will output 2-Channel PCM via the Tv's optical out. Now many later model TVs have corrected this issue and will output 5.1 audio from any source that can support it. To avoid this limitation of many TV sets what I would suggest you do is....
Connect ALL sources to your Surround Sound Receiver first and then use an HDMI cable to connect the Receiver to your TV. This way you will never have to deal with these audio issues. You can still connect your TV's optical out to your receiver as well. That way you can enjoy 5.1 audio with the internal digital tuner and smart tv apps.
You can still connect your TV's optical out to your receiver as well. That way you can enjoy 5.1 audio with the internal digital tuner and smart tv apps.
If the TV and receiver both support HDMI ARC then you don't even need that. The TV will be able to send audio back to the receiver using the same HDMI cable you use for playing video from external devices.
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