Class D

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.  Don't be stupid....he does not want to learn....he just wants to be right.  Let it go.....let him go.  Just let him post what ever nonsense he wants and pretend it does not exist.  You will be much happier, if you do.

What we really need is feedback from those that have listened to the latest class D amps versus the latest class A and class A/B amps (within the same price ranges).  We need actual listening test impressions.....not all this guess work.....it is just a bunch of noise.

The Technics amp that is about to be released has tons of stuff inside that could make it sound great.  Technics does not even mention 1.5 meg or phase shift in their literature.  This thing could be really fantastic.....but there is no way you can say it is because of 1.5 meg or phase shift.  Please read all the info....very revolutionary.  It has 4 switching power supplies that switch at 500K....It is not really a standard class D at ALL.....it is fully digital (like the original Tact amp and Lyngdorf).  It takes an analog signal and converts it directly to high speed PCM and does all kinds of low jitter manipulations to make the distortion go down.  The PCM signal is then changed in software directly to PWM (class D).  Please read all the lit.

https://www.technics.com/us/products/reference-class/integrated-amplifier-su-r1000.html

https://www.technics.com/us/about/press/releases/20200901-su-r1000/index.html

https://www.youtube.com/watch?v=b-BJifbtjbI

George did start a thread on this new goodie....so when this comes out and people have listened then we will have a REAL idea of how good it is.  It looks great....I do hope it sounds great too.

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.