Maybe yes for the treble, ok. But I'm sure the bass is dry compared to that of the Fosi set flat. I don't listen to electronic music, I don't need that bass. But with the Fosi the bass sounds like a couple of Presonus Eris E5 I own (studio monitors), punchy and fast. I spent a day doing an A/B comparison. And then I didn't talk about the AB class in general, I'm referring to the comparison with the AS 301.
You need to understand that these differences you've perceived are very unlikely to be real, either the treble on Class D or the "boomy" bass on Class AB.
Consider the possibility that your expectation shapes your perception