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Sorry you are right I should have been more clear, my AVR has HDMI inputs that support HD Audio and 1080p.I'm assuming you mean "AVR that doesn't support it" to refer to 4K support, but your receiver still has HDMI input for say 1080p video and audio.
In that case, you would be correct that S/PDIF or coax digital audio won't do the lossless audio codecs like TrueHD or whatever the DTS equivalent is. If you've got a 7.1 setup, you'll obviously miss out.
If you've got 5.1 or less speakers, then honestly running the output at regular DTS or DD 5.1 is pretty fine, and you can achieve that over S/PDIF or coax digital output using the onboard soundcard or an add-on like the Sound Blaster Z. This is what I do, my AVR is very old and doesn't even have HDMI at all, so I use the SB Z to encode all audio as DTS and pass it through this way.
If you need the 7.1, then things get a bit complicated. Because it's not just the video resolution that's increased, it's the actual HDMI spec. So your 4K UHD player/PC is going to be spitting out HDMI 2.0 / HDCP 2.2 encoded stuff, but your AVR device is likely only HDMI 1.3 or 1.4 with.. whatever lower version of HDCP existed then, I can't remember. You could buy something like a splitter and plug the 4K player's output into two places, but you're likely going to run into problems where the AVR can't make sense of the HDMI 2.0 connection.
There are all sorts of HDMI audio extractor devices, but almost all of these only pull out the 5.1 audio streams and present them via SPDIF or other format; they can't extract the 7.1 streams. There is one of them on Amazon that claims to be able to do this and present LPCM audio via 4x analog 3.5mm audio outputs, but it's got really shit reviews so I'm not sure I'd trust it.
In the end, you've only really got one hope; that your TV has some kind of audio passthrough output via a secondary HDMI connection or something, and even then I'm not sure it'll work. Either that or just living with 5.1 audio. Living with 5.1 audio is probably what most people would do, because really, a shitty soundbar would be an improvement in audio for ~90% of home TV setups, and 5.1 DD or DTS still sounds great.
I only use 5.1 although the receiver supports 7.1, but I do notice that some audio tracks from movies are HD Audio but only 5.1
Thanks man. I have 7.1 ability but it's just not practical in the living room to have all those speakers.Ah, k. Yes then you should just continue how you are, and presumably continue to receive great audio. The newest 'HD' codecs like Dolby TrueHD and DTS-HD themselves are losslessly compressed, and theoretically higher quality than their lossy compression 5.1 predecessors Dolby Digital/Plus and DTS, but that difference would be incredibly difficult to detect, especially in common home theater listening environments. In my opinion, it's definitely not worth any money to upgrade to the lossless codecs unless you're also graduating to 7.1 channels.
Interesting, I assume I would need to have two hdmi ports on the pc? Or potentially a DVI to HDMI adapter. Or maybe mix onboard and the gpu?There is a simple solution with a minor inconvenience.
"Extend" your 4K display to the 1080p AVR, you can use a different resolution to the main display.
This will make the AVRs HDMI sound interface available in playback devices to give you full quality.
The inconvenience is that your mouse will disappear onto the AVR display sometimes.
When I had this issue I moved the extended display to the top left corner so the mouse only ever disappears if it goes off the top left of the screen.
It didnt happen often but when I couldnt locate the mouse I would drag down+right.
It was easily the best way to handle the problem.
Interesting, I assume I would need to have two hdmi ports on the pc? Or potentially a DVI to HDMI adapter. Or maybe mix onboard and the gpu?
"Extend" your 4K display to the 1080p AVR, you can use a different resolution to the main display.
SinisterDei covered it well.Interesting, I assume I would need to have two hdmi ports on the pc? Or potentially a DVI to HDMI adapter. Or maybe mix onboard and the gpu?