Congrats on the new toy. I'm sure it will be awesome. My k01x took a really long time to "open up", which makes me believe that break in is real. I use 8x upsample and s_dly2 filter. I find it very pleasing, creates a more spacious sound. I don't know if the d02x has all the same filters.
As to the preamp question... I believe that the preamp is the heart of the system, and it greatly impacts the overall sound. You should not skimp here. But I don't know anything about the one you have so I can't comment on it.
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