Features wanted in a Wiim Ultra 2

The WiiM ultra:s internal dac sounds better today than before. I compared a year ago to my external dac that was better sounding, and compared again yesterday. Now the internal dac sounds better with more detail and less sibilance. Probably some improvements done in firmware ? I’m gonna sell my external dac .
 
The WiiM ultra:s internal dac sounds better today than before. I compared a year ago to my external dac that was better sounding, and compared again yesterday. Now the internal dac sounds better with more detail and less sibilance. Probably some improvements done in firmware ? I’m gonna sell my external dac .
Probably not, the DAC circuit is designed as-is and seems to follow the reference design quite strict. The only thing that for sure was changed in firmware was the ability to change the curves of the digital filter which was always included in the function-set of the DAC chip but not enabled for the user to change. Even budget DAC's are transparent to the source for some time now so most of the differences people think they hear is just in their head, confirmation bias, wishing it to be true.
 
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