An amusing coincidence, and not to contradict your experience, but the first review in the first "hit" when I googled TA2022 described it as less fatiguing than a conventional amplifier:
>>> The best way I can describe the Topping compared to the NAD is that the sound is richer and "warmer" (I realize this may sound strange). Listening to music through the NAD for a while got tiremsome or fatiguing. I don't get this with the Topping.
>>> The best way I can describe the Topping compared to the NAD is that the sound is richer and "warmer" (I realize this may sound strange). Listening to music through the NAD for a while got tiremsome or fatiguing. I don't get this with the Topping.
https://www.amazon.com/gp/customer-reviews/RS7NZ301THAJP/ref...