Competitive class D amp suggestions

Very curious to hear the difference between my AGDs and the Atmas.

In chrome, my Audions are $8400. The Atmas are only &5400.

@clio09 

Your Berning OTL is something like $80k… is it not? And the Atmas go head to head??!

Thanks for sharing to this link!

I had a brief look at this information, and may have a more detailed look afterwards. I understand now more about harmonics and the distortion. I  general, much depends on which particular mathematical model is used . Here using merely a third degree polynomial might not be a most refined  way to model this   problem.  But it's always difficult to find a precise mathematical model. Like in quantum physics, the quantum equations somehow work. The outcome though is difficult to explain from our Newtonian point of perception of the world. Something similar maybe happening in distortions and measuring the distortions. In fact the formula that I just saw for measuring total harmonic distortion is a bit rough to me. So based on that formula the measurement might not say too much or even could be not really relevant. But there is an immediate practical observation that the second order  harmonics somehow amplify middle and high frequencies making them sound softer, and the third order harmonics in fact amplify the amplitude so the sound becomes more dynamical. Based on these practical observations mekes me to think  that both kind of distortions are good.  Auditioning now my set tube amplifier and analyzing what I have just read I understand and feel more what is happening. 

From here on THD will be irrelevant for me to judge about audio gear. Purifi model will neither attract me any more. As I suspect, it is hard to achieve 100% of linearity, i e., an ideal natural sound preproduction. In this regard, the second and third order harmonics could be helpful. I guess this is merely the reason why many people including myself like tube amplifiers. 

Actually, I don't know how the second and third order harmonics are dealt with in class d amplifiers in general, and in GaN class d  amplifiers, in particular. Any input on the subject would also be appreciated. Thanks again for your input.

Actually, I don't know how the second and third order harmonics are dealt with in class d amplifiers in general, and in GaN class d  amplifiers, in particular. Any input on the subject would also be appreciated. 

Perhaps because they are there but rather inaudible to mortals.  This review puts a March Audio (Purifi based) amp through the tests.  Some lower order harmonics *do* exist (maybe contrary to what I said previously) but at barely there levels.

I have not seen any GaN tests.  Some may exist, but not for AGD or Atmas that I am aware of.  I can't recall the dude at AGD even mentioning harmonics in his rather infrequent announcements..