Class D started as the "beyond meat" of amplification designs.
Now, that’s funny. But, looking at the Technics, they’re not using an off the shelf Class D unit but designed theirs in-house and turned the whole thing into one big DAC/power amp, again, not using any off the shelf DAC from another make.
A retailer told me that Technics is doing things other companies simply haven’t thought of. The only other company that comes to mind is Esoteric, who developed their own DAC architecture in some of their players. There must be some others but I haven’t researched enough to suss them out. FPGAs are becoming commonplace but this is another kettle of fish.
(grannyring, it’s a Technics SU-G700 and not a Yamaha)
All the best,
Nonoise