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

Showing 2 responses by jonnie22

It was stated earlier in this thread that "there are no truly digital amplifiers".

This is very wrong. They’ve been out for 20 years -starting with the TacT Millennium in 1998 and reviewed (that year) by Robert Greene of The Absolute Sound.

Wadia had their PowerDAC right after, but it was never reviewed and only had a 3-year life.

The TacT was re-branded under Lyngdorf Audio. It has been joined by the NAD M32 and Technics R1 - the only 3 in the world I’m aware of. (Another from Italy, was ’blogged’ by Clement Perry of Stereo Times, but was never reviewed).

Though they have diff. methods of attenuating the signal, they all share the same (basic) topology -a DAC-integrated w/o separate sections. Meaning NO analog stages, NO converters. The switching output stage acts as a D to A.

What’s shocking in 2019 is how few audiophiles are aware of this revolutionary product category. There are reviews in the past 5 years, starting with Jim Merod in PFO (reviewing NAD’s M2 back then).

So it’s catching on, one decade at a time...
No DAC needed for the amps I mentioned. Digital-in, w/o converters, meaning a digitally-amplified signal.

How else do these power a signal ?

No-one here should listen Ralph Karsten. He knows tubed circuits and that’s about it...