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?


128x128Ag insider logo xs@2xcelander
George,
it seems to me there is a big confusion about supply chain cost, and even more about why HiEnd audio is more expensive than consumer products.
The design Idea of AGD amps (by the way 200W on 4ohm, so I would like to have the header of this blog corrected eventually), was not simply the utilization of the GaN as power semiconductor for the power stage, which is actually a specific innovation per se.
The product has also unique features about the industrial design, materials, finishing, shape proportion and the way it is presented overall, including, last but not least, the non trivial idea (easy to imagine a bit more challenging to make it as industrial product), of integrating the power stage in a glass tube.
So there are many peculiarities that make this product quite unique among all kind power amps in the market, and certainly, unique among the one using GaN.
Moreover, you underestimate the issue of distribution costs, and dealer margins that unfortunately, have a serious impact to the overall economics.
But instead of making a case with a long list of negative things and hoping or wishing for a brutal mass market distruction of values, intelletual property, patent infringments and so on, why don’t you spend the time to try and listen the sound of these new products?
Then you would be able to make a more serious case, expecially if in the process, you discover their true value.
Hope to see you at Axpona and possibly in Munich
Best
AG

AG most of us here hope to see a 200w GaN for close to $1 or $2k which is doable one day.

Have a look at Red Dragon S500-$1k v Continuum 2-$10k both of which use very similar electronics.

Your are selling yours for $15K, you can’t tell me if a big company like Sangway decided to put them in a plain metal box, like the Red Dragon, made thousands of them they couldn’t be sold for around $1K.

It’s already down to $4k with the GaN Technics SU-G30 network integrated amp, and that’s a lot extras in that one with preamp.

Cheers George
For informational sake...Merrills other offerings for GaN amplification also include.
Element 116 @ $22,000.00 per monoblock pair.
Element 114 @ approximately $12,000.00  per monoblock pair. [pending release] 
 


The original post cannot be edited once someone posts a response. I admit certain mistakes exist in that original post that adversely affect all three manufacturers in one way or another. All errors have been addressed in follow-on posts. 
As the GaN is used in the non-linear stage i.e. the output, it just operates as a very fast switch, the benefit of GaN is less heat, and higher switching frequency.
GaN is a non-linear power device and really should not matter for sound quality. It may be easier to design an amp with GaN, but audible effects should be unrelated, unless a much higher switching frequency is used to advatage of simpler filtering and higher resolution A to D converter is used.
Too much sales jargon.