Iv got a windows carpc in mine.
Using a sabre DAC (cheap but mid-high end) and a Mini-DSP (like the Cobb AP of processors) with a power filter. Everything is externally powered with clean 12v.
Connecting to the stock system creates some ground loop issues, but with aftermarket speakers should be fine.
With a good Digital to Analogue converter (DAC) an some form of Digital Signal Processor (DSP), you should be able to get good quality. Just be prepared for lots of messing around, as it won't just be plug and play.
I'm hopefully installing my focal 2-ways this weekend, so I'll let you know how it sounds in the end.
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