It has been awhile since I've measured any of the Raspberry Pi DAC HAT boards. In fact, it was back in 2016 that I got the HiFiBerry DAC+ Pro which I still use for basic streaming in the living room these days. Thanks to blog reader Doug Gardner, he sent me both his HiFiBerry DAC2 HD (~US$100) and DSP add-on (~US$60) boards you see above for testing. Doug was also very helpful in providing some
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