What chip is used in the Majestic DAC?

"Cirrus Logic Inc. is an American fabless semiconductor supplier" (Wikipedia)

Unlike International Rescue it has no FAB!

And neither had Wolfson.

Unfortunately, in these days of vulture capitalists, manufacturing doesn't factor, or should I say, they factor it out. 

It's similar to me and printed circuit boards. I design them (have done for 40 years) except, once upon a time, I also manufactured them. Cirrus, Wolfson etc, have never manufactured semiconductors. They designed them and sub the manufacturing to fabrication plants.

One reason the fab plants are in China and Taiwan is coal. Other countries urged us to go green so we'd become reliant on them. Semiconductor silicon is made from quartz and coal.

Whereas printed circuits were printed (photo or screen) from 4:1, 2:1 or even 1:1 passive layer artworks, the fabrication layers of a silicon wafer work from several giant artworks reduced to masks, for depositing and etching metallic latices and silicon, using photo lithography and lasers. The process also includes incredible amounts of water - very pure water - and the year before last, Taiwan had a drought so had to ship in water from other countries, just for the machines. Drinking water was rationed.

But before that, Covid19 happened, and lockdowns meant that Just In Time manufacturing stopped, which closed down the machines. After two years, the World economy was so bad that governments decided to "let it rip" and try to restart, but that takes some time. The "bioweapon" (Covid19) is equipped with gain of function, so plants reopen only to shut again, with the next strain of Covid19.

He who shouts loudest gets fab time, and there are many more commercial applications in the queue before our lowly stereo needs.

So, even though there are alternatives to the abandoned Wolfson chipset, the lead times on these are years, not months. And even after a year or two has passed, some fabless semiconductor suppliers might run out of capital, or the vulture capitalists could do a runner.

It is even getting harder to source op-amps and other special function ICs, and so most of my time now is spent working on discrete transistor designs, using the few suitable transistors that are still being made.

I don't think I'm able to do a discrete DAC.