GaN-based Class D power amps


The use of GaN-based power transistor tech is now emerging for Class D audio power amplifiers. Seems appropriate to devote a forum thread to this topic. At least 3 companies have commercial class D amps in their books:

Merrill Audio, with their model Element 118 ($36k per monoblock, 400 W into 8 ohms, 800W into 4 ohms), Element 116 ($22k per monoblock, 300 W into 8 ohms, 600W into 4 ohms) and Element 114 (coming soon). 
https://merrillaudio.net

Review of Element 118 at this link:
http://www.enjoythemusic.com/superioraudio/equipment/1018/Merrill_Audio_Element_118_Monoblock_Amplif...

ADG Productions, with their Vivace Class D amp ($15k per monoblock pair, 100W into 4 ohms). (The designer emailed me indicating he has another product in the pipeline.)
http://agdproduction.com
Review of the Vivace Class D moniblocks at this link (warning: link might not work (1/11/2019)):
https://positive-feedback.com/reviews/hardware-reviews/agd-production-vivace-gantube-monoblock-ampli...

Technics SE-R1 Class D stereo amp ($17k per stereo amp, 150WPC into 8 ohms, 300WPC into 4 ohms) 
https://www.technics.com/us/products/r1/se-r1.html
Preliminary review of the Technics SE-R1 at this link:
https://www.stereophile.com/content/technics-se-r1-digital-amplifier
Technics also has a lower priced GaN-based class D integrated amp in their catalog:
https://www.technics.com/us/products/grand-class/stereo-integrated-amplifier-su-g700.html

Anyone listened to or own any of these amps?


Previewcelander
The very first GaN versus GaN sonic test
Really!! your calling that a test, your priceless.
Bit rich coming from one, especially that had this kind of 70 degrees of phase shift down into the audio band in his own attempt at Class-D manufacturer, and tried to deny it. https://ibb.co/jfd6tqy
> phase shift > result of low order output filter > result of switching frequency between 600-700khz being too low.

SE-R1 Switching frequency much higher at 1.5mhz > results in output filter now being much higher > results in phase shift now being well out of the audio band > results in better upper/mids and highs, the Achilles Heel of today’s Class-D designs as many that can tell hear.

@georgehifi lol as i said folks people like george are the reason I don't post much.  No George, I'm not calling it a test, it's called a listening comparison, just like I stated. I'm not a professional reviewer George. George wants me to prove where I heard these? Well George, I didn't take pictures of the listening "tests" that you call them because you would not be able to hear through pictures, but I can prove one thing, so its time to put your money where your mouth is. I own the AGD's (as mentioned in my first post) I will take a picture of them with a note in the picture as proof. If I can provide such proof to you George, you will leave this thread forever and never post again here. Deal?

LOL @georgehifi your silly link is for an ICE Module, but nice try.

@georgehifi george do you know anything about all the differnent GaN devices used in Technics, AGD, Merrill, and your beloved eval board from EPC? Only one manufacturer uses GaN devices purposed for Audio, do you know which one? 
georgehifi,

If you believe this is the actual phase shift of the output of an IcePower based amplifier, can you explain this near perfect 1KHz square wave?

https://www.stereophile.com/images/archivesart/555Belfig2.jpg

If you have that much phase shift at 1KHz and changing considerably over the harmonics of a 1KHz square wave, then there is no way the wave would look square.
Perhaps there are holes in your knowledge that prevents your understanding of how these things work .....