I'm looking for a solution to drive the Hifiman HE 6SE V2 that is arriving monday. I picked this up with hopes for doing that, 2 watts might just be enough to do it, but will be pushing it to the limits. I really enjoy my Topping E30 dac and was hopping not to have to replace it to get more power.
The lowest price 4v DAC I can find is the Schiit Modius, so I may have to pick that up for these if I like them and figure out an Amp solution. On my Sundara, the A30 Pro does sound a bit better than my Atom Amp, but it's not a major difference. Power wise for the Sundara, both work fine, the HE 6SE V2 will be the true test.
Believe me 2W is much more than enough, unless you also do EQ. 100mW will get you very loud.
For 4V dacs, D10 Balanced is going to be released in 3 days. You may want to look at that. If you want the full power out of A30pro of course.
And yeah, amps don't really have much of a difference. You should benefit more from EQ and using better headphones. (I see you are having He6se v2). So yeah. Enjoy music.