Class D

They essentially are making a power dac, and as opposed to simply switching fast like the aforementioned rock has indicated, they characterize the load and appear to implement digital filters to compensate for the phase shift.

Build your own GaN based 200w 8ohm stereo power amp

For those who have experience and can kit build, here is from the ones that made GaN technology happen for Class-D.
A ready made 200w @ 8ohms 300w @4ohms stereo Evaluation board for $1k.
Stick it in a nice ready made Chinese chassis add a powersupply and your up and running.
I don’t think they used the 1.5mhz switching like Technics did, but it should be as good if not better that anyone else’s that will be much more expensive

https://gansystems.com/wp-content/uploads/2020/05/GS-EVB-AUD-xxx1-GS_Technical-Manual_Rev-200526.pdf

https://au.mouser.com/new/gan-systems/gan-sys-gs-evb-aud-xx1-gs-audio-evb/

https://au.mouser.com/ProductDetail/GaN-Systems/GS-EVB-AUD-AMP1-GS/?qs=vHuUswq2%252Bsym8eVHEaFTmw%3D...

Cheers George

Received confirmation yesterday that I'm right. I was perhaps 90% confident prior. I'm about 99% sure now. 

Tsunami coming! 

 

https://gansystems.com/wp-content/uploads/2020/05/GS-EVB-AUD-xxx1-GS_Technical-Manual_Rev-200526.pdf

Instead of just posting a link, you may want to actually read it and understand it.  Note the differences between open and closed loop. Note how the closed loop has better performance at low frequencies but the performance degrades quite a bit at high frequencies?  This is a consequence of inadequate design, pretty much as atmasphere has repeatedly stated. Thank you for providing yet another excellent example.

This eval is tech evaluation platform. It is not intended to push the limits of technology or topology. If someone is looking to buy modules and DIY, they would be better served with ncore or purifi modules with significantly better performance.

Please don't be stupid. It is stupid to respond to George.....he is a rock....he will never move from his position.....and he has to have the last word.......so it will always go on and on and on.

@ricevs I get what you are saying, and regret the diversion that this has often caused. Generally speaking, if there is going to be misinformation on any given thread about class D on this website, the chances are very high that it will be coming from George.


Now I could sit back and watch him do that; I have a theory that a rising tide raises all boats. So knowing the truth of the matter should I sit back and do nothing? We've all seen in the past when someone passes misinformation as truth that it is possible that everyone will suffer. OTOH if I do respond, it looks like I have a personal beef with George which I don't - I've never met him. So this has been an on-going dilemma for which I've never felt I've had a good solution.