michaelgreenaudio
Thanks for the link George.
That's ok Michael, here another little read you may be interested in, it from the AES Berlin White Paper presented by EPC's (GaN) Steve Colino and Alex Lidow inventor of the Power Mosfet all those years ago.
EPC's White Paper "excerpt" on GaN technology used in the Technics SE-R1 and Merrill Element 118:
"You can increase switching frequency and audio bandwidth to reduce the filtering cost. The choice in optimal switching frequency is always a trade-off in EMI profile, efficiency and audio performance. The ability to use much higher switching frequencies before compromising efficiency allows for a much range within which to make this trade-off. The result is a more optimized audio solution without fear of Thermal or EMI boundaries.This is why you'll see, Class-D's with heat sinks inside for each channel like the Technics SE-R1, if they've used the higher 1.5mhz switching speed available to them to use with the GaN.
Most importantly, you will be providing, by far, the most realistic listening experience to your customer in a Class-D system."
https://abm-website-assets.s3.amazonaws.com/ecnmag.com/s3fs-public/embedded_image/2018/02/figure1.PN...
I also asked EPC by email what manufactures other than Technics and Merrill Audio are using or developing Class-D amp with their GaN technology, they replied today, other than the two I mentioned, they said:
" We are unable to reveal due to the Non-Disclosure Agreement (NDA) with our customers.Finally it seems Class-D has stepped it up in a big way in technology because of EPC's GaN technology, and maybe put up a fight against the very best of linear amps for sound quality in the mids and highs, I think they already have that mantle for bass performance.
But I can assure you that there are several customers globally, developing with eGaN FETs for Audio applications, primarily due to the benefits it offers."
Cheers George