I'm sure with enough money they exist.
I've seen windows based head units, if they could play foobar from an external usb drive then any dvd-a or sacd .iso could be played.
In my car I have a 256GB and a 500GB usb external SSD drive that I hook to my head unit but I have to have everything formatted as FAT32 which is a PIA.
Unfortunately I think windows based units are a stripped down version of window (windows mobile or something like that) and I don't know if you can install and play software like foobar.
All excellent but you still need a head unit that can process 6 channels discreetly, and to my knowledge nobody makes one anymore. Like Tim said, the hdmi capable units all downmix. I think it would have to be an actual pc as the source unit. Or a laptop with a quality 6 channel sound card, if they are out there? Kevin
Any car dvd-navi player featuring the "dual zone" option is doing a true multichannel in disguise.
I've read somewhere about a guy who built a car system based on a Kodi mediaplayer and using his mobile phone as the graphical remote control.
Plenty with 5V dc supply and HDMI output that do multichannel. WiFi from mediaplayer to phone. Media player has USB for media (FLAC etc)
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