Has anyone switched from Class AB/A to Class D? Was it better? Was it worse?

@westcoastaudiophile , in most of the sonic aspects including the power (per dolar of  price - although it is well understandable that one cannot compare the real  power per-watt, in general,  of any SS amp with that of a tube one). The distortion at 1kHts is standardly  measured. I am not a technician, but it is well-known that, not always, technical data is linearly reflected in SQ (e.g., take HD of the tube amps).  

@niodari you may read about class D design here: https://people.engr.tamu.edu/s-sanchez/ECEN%20607%20Class%20D%202011.pdf

@dman777 I ordered them based on a class A rating in Stereophile and the price for the pair was in my budget. Also, they each have a tube. They are quiet, neutral, dynamic, clear and very accurate. I like how they sound. They run slightly warm.

I'm very happy with them. 

My system is very simple.  My source is a McIntosh CD/SACD player that also has a preamp section. XLR cables to the M1200s then speaker cables to B&W 803 D3, and SE cables to the JLAudio subs. In my treated room, with careful setup, I am very happy with the sound.

You may dial 500mW output @ 1kHz sine on any D class and A class amp and compare waveforms to understand D class problems better!

@westcoastaudiophile Actually there are a few class D amps that have a better first Watt than a good number of class A amps. One thing about class D is for the most part (as long as they have an analog output filter) they are immune to crossover distortion. So there can be a complete lack of higher ordered harmonics at very low power levels.

That looks good on paper and sounds good too.

Put another way if you want to show what might be wrong about a class D amp compared to a class A, this particular metric isn't it.

In 2025, Class D is the best way to go.