I recently (late last year) got one of these modules, this one looks intriguing and I’ve been happy with other products (amps and DACS) I’ve purchased from Hifimediy.
The idea behind this unit is it leaves out the output buffering stage that a lot of DACs have, directly connecting the DAC chip via just a pair of Mundorf caps (reasonable quality) to get rid of the DC offset in the DAC signal. The board is laid out to be easily tweakable, and as the board is it’s only using 1/2 the signal as the DAC has a balanced output. I’m more than happy with the default ouptput so have just simply wired it to RCA outs.
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