I A/B ed the 590 vs. the 600. The 600 was a noticeable step up. I suspect the new DAC has a lot to do with the difference. Maybe take a good look at the 400 if you can demo one.
IIRC the many felt the H590 was not worth the increase of price to the H390 for the slight sonic uptick. Both DACs performed similarly very good.
The subsequent release of the H600 had a notably sonically better DAC so I assume the following H400 has the same DAC sonic upgrade. If so, since the OP plans to use the internal DAC, my nod goes to the H400.
If the H400 has a better DAC go for it. I have similar power (on spec) to the H590 driving 40.3 XDs and the meters and volume setting tell me the amp is barely breathing at moderate to loud levels.
What those speakers do need is SS grip and plenty of headroom which I would think either option has in spades.
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