Very happy with the sound quality of this unit. I've used it successfully to play 24-bit 192kHz HD audio. (I can't test higher sample rates/bit depth or DSD compatibility.) To get excellent SQ, we recommend using a linear power supply or a heavily filtered switching power supply with the Raspberry Pi. The Digi+ Pro has the ability to connect a dedicated power supply soldering one of the pins to ensure full isolation from the RPi. I haven't tried this, but I suspect it's the way to get the best possible SQ. (I use an iFi iPower filtered power supply with my RPi).
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