What I've never understood: in such high priced stuff, why don't they use toroidal transformers? Always wondered about that.
The C-Audio power amplifiers I encountered in the early 90s essentially were two cooling tunnels chock full with Hitachi MosFETs, surrounding a massive toroidal, with supporting PCB's squeezed in where they would fit. 600watts per channel, infinitely. No "peak power" shit, just grunt. Then, they were pro stuff, not Audiophool bait. The toroid probably saved one rack unit in height, which is important.
Sadly, they suffered from soft-start relay failures, so had to be repaired, which meant getting the PCB's out. Not funny. Lucas Electric in sports car designed by Italians level not funny.
Some Ferraris need the engine lifted out to swap some drive belts, required at insanely small intervals, netting a 5k€ work fee.