Plinius class A vs. class AB sound difference?

OK I spoke to the manufacturer and they replied that SA amps work for 8 Ohms in class A upto the specified wattage: SA100 -- 100W/ch SA50 -- 50W/ch SA250 is certainly 250W/ch. For lower load impedance they switch to A/B operation type to double the current.
Plinius 8200p is not identical to SA100 since it has lower switching point to the class B and that point is relatively high as well i.e. ~25...30W/ch of class A. I assume that these two units have completely different power supplies and heat sinks if you just take a look even on the pictures of them.
Plinius 8200 MKII has M14 preamp and 8200p poweramp integrated into one chasis with separate power supplies for each part.
Overall I can say that there is a Plinius sound signature on all of above stated but flagship SA series are more open worm and defined.
Despite working in class A on 8 Ohm loads all of Plinius models love the heavy speakers such as Thiel, JM Lab or Apogee and to my thought they do the best job on them.

You owe it to yourself to listen to the Plinius SA 102.

I own an SA-250 MKIV and I can honestly say that there is a perceivable sound difference between AB and A (A sounds better, smoother).

I also tend to agree with HACKMASTER in that the amount of power required to drive the speakers will invariably affect whether or not you'll hear a difference between class AB and class A.

You’ll have to be able to stand the heat though. The Plinius amps run murderously hot in class A. You’ll see a difference in your power bill too. Happy listening!

My SA100 MKIII has just the slightest amount of grain in AB mode that is gone in A mode, also in class A there seems to be better definition, or maybe it is my imagination, it is that close. It sounds superb in both modes (driving Maggie 1.6s).

I had an SA100 III and had the same question, so I listened blindly as a friend switched the amp from A to AB with several different types of music. For each song, he switched the amp back and forth, and I indicated which I preferred. For all tests, I preferred the amp (no surprise) in class A. There was more bass, smoother top end (less grainy), and much better depth. For me the difference was big enough that I always preferred the amp in class A, by quite a bit.

I haven't heard the 8200, but I doubt that it sounds as good as the SA100 in class A.