The challenge you have is that a device that meets your spec is going to have to decode the optical surround sound signal from the TV which means it is going to need a chip and support for the codecs such as Dolby Digital and DTS. That is going to drive up the price and why what you're seeing are AV receivers. Unfortunately you don't need a switch, you need a surround sound DAC and those are not very common.
this post was submitted on 30 Jul 2023
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BudgetAudiophile
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Doesn't z506 also have red and white rca connectors? I've had my tv connected to those and the PC connected to the 3.5 jacks for years. Both audio streams play on top of each other but I just mute or stop the PC sounds using an IR remote