The digital Xover not my cup of tea , I would rather flavor to the sound I like .
there are tons of great sounding old fashioned class A , class AB amps.
vaccum tube single ended, triode, pentode amps. My audio sounds real good . gan is just One type of faster type transistor ,there are a ton of other parts of very high quality that makeup a great amp , the $1500 amp has literally$400 into the whole build rule of thumb in mfg 25% goes into the build ,then R&D
and promoting this too including packaging. That’s why there is many great products out there , as long as you can afford them.