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?


celander
I',m back, after just completely putting the GaN amp at a disadvantage. Its 100W at 8Ohm and I put one amp each channel whereby I took the midrange driver lead from my outboard crossover and put a full .7 Maggie on it rather than going to the 3.7i panel. My purpose was to find the line of the AGD and I did of course. Whats nice it the channel just stops music, when you turn it down it comes back. So you will not damage the amp or speaker with this kind of protection so thats cool. I would say that the Vivace monos would be perfect with speakers 90db and above. The articulation and quickness would be very well matched.

By the way, I'm not a typical "dealer" per se.. Im a manufacturer, founder of Verastarr AudioFoil Cables. Thats my main thing but when my users want to buy ancillary equipment, I like to be ready to serve them without skipping a beat, so if no client is asking, I'm not advertising gear whatsoever, unless its used or demo, I'm moving out.
George, isnt the Technics like $30K or something ?
Anyways I'll go back to testing the GaN with something its own size to be fair.. So like a Rowland 125 actually at $3K.. seems off  but its the truth..

George, have you spent any time with Rowland amps ? Forget continuum, it seems to be a sore spot,(im sure there is more to that design we cant see and I'll share any info I get, plus If I needed to i could expose a myriad of other top level HEA companies using drek inside. Ive got to believe there is more to it because if youve ever met and spoken to Jeff, hes not the sheister , hustler type whatsoever, its quite the opposite. As a total kid/ newbie, I remember Jeff was the only HEA  Icon who looked me in the eye and listened to what I was saying. To this day he still does this for anyone that speaks with him, which shows great respect for his fellow human being. I also know Mark Levinson and God Bless him hes got a different way, 100% entertainment for me to watch, but Mark is from the streets of NYC, Jeff is up in the mountains.. so you catch my drift... You do however make an interesting point.. I will get to the bottom of it.  Meanwhile  I'm happy to ship one of Jeffs amps for you to try out in your rig, I am a real picky SOB and they are very well built and great sounding.
All the best.!
I',m back, after just completely putting the GaN amp at a disadvantage. Its 100W at 8Ohm and I put one amp each channel whereby I took the midrange driver lead from my outboard crossover and put a full .7 Maggie on it rather than going to the 3.7i panel. My purpose was to find the line of the AGD and I did of course. Whats nice it the channel just stops music, when you turn it down it comes back.



I have no idea what this paragraph means.

Mike Powell wanted me to correct my OP regarding the power output of the AGD Vivace monoblock amps. Unfortunately, I can’t edit the OP once someone responds.
While the AGD Vivace can output as much as 200W into a 4 ohm load, I interpret this to mean output power at clipping. The nominal power output is 100W into a 4 ohm load at the rated distortion specs. See the technical specs page from the AGD website:

https://photos.app.goo.gl/Suyt7GsGYmSXiv7JA

Regarding the cost of the Merrill amps in my OP, I incorrectly stated these prices as per monoblock chassis. I corrected this pricing error to reflect the price per monoblock chassis PAIR.
@erik_squires  If you take a look at OCD Guy HiFi videos on YouTube you will see Mike P's audio setup. I think if yo visualize his system you will understand.
Hi Guys and greetings from Germany!
I'm new here this is my first post in this forum. While surfing around through the internet looking for news about Class-D amps I found this thread and somehow had the feeling to add a comment. Because luckily I'm one of the 1st owners of a pair of the AGD Vivace GaNTiube monos here in Germany. When I finally got a pair of the "ready to release" version of the GanTubes I was blown away and could not stop to listen these little things. I must say I was used to a Nelson Pass F5 Turbo (pure Class A) and I always were happy with the F5 but the GaNTubes have blown it away. In every aspect, especially the mid-highs they distribute so much... lets say 3D sound. I was just astonished about the difference to my F5. It feels like you can grap
every single instrument or singer in the room. Just fantastic! If someone has the chance to listen to the AGDs I can only recommend to take the time and do so, it will be a great experience.
I'm driving a 8Ohm broadbandspeaker-Expo horn with 93dB efficiency. And it perfectly fits together.
Of cource 15k $ for pair of the AGDs is a lot of money but for HiFi lovers in my point of view worth every single Cent.
Cheers,Mallard