Here is an interesting read for those at odds with what’s being presented here. Not just with the filtering of the switching noise, which I primarily "bat" on about, but also what is a secondary problem of Class-D advantages in the "dead time".
From the makers of the GAN transistors that Technics use in the SE-R1.
" EPC’s enhancement-mode GaN (eGaN®) transistors switch up to ten times faster than silicon MOSFETs, with ‘zero’ stored charge. The increased switching speed of eGaN FETs allows amplifier designers to increase PWM switching frequencies, reduce dead-time, and drastically reduce feedback; producing a sound quality previously limited to large, complex, heavy Class-A amplifier systems."
Also there could be a module for sale using these eGan transistors from Austin Texas.
Elegant Audio Solutions of Austin, Texas, has produced an amplifier capable of a continuous power output of 200 Watts into an 8Ω, or 400 Watts into a 4Ω speaker load, with THD+N as low as 0.005% and very low feedback. Moreover, this is done without the need for a heat sink and eGaN-based amplifier can plug directly into the standard amplifier implementation of many existing systems.
https://epc-co.com/epc/Portals/0/epc/blogs/elegant-audio-solutions-eGaNAMP2016.pngCheers George