Pi versus Pi By Steve Graham Raspberry Pi 4B with S/PDIF Out versus Raspberry Pi 4B with USB Out Confession time. In responding to those kind enough to comment on part 3 of my Raspberry Pi series, I mentioned that I didn’t have a decent USB DAC for comparison. WRONG. It completely slipped my mind that my PS Audio DAC has a USB input. A cream pie in the face for me. To satisfy my own curiosity and maybe mend a few fences with readers, I’ve run a quick comparison between two Raspberry Pis. One is a Pi 4B with the HiFi Berry Digi+ Pro HAT (the Pi used in the 3-part series), which sends digital out over S/PDIF coaxial. The second is a Pi 4B (no HAT) sending digital out over a USB connection. In both cases the digital signal was routed to my PS Audio DirectStream DAC. The PS DAC did dual duty in the three-part series, receiving data from both the Pi with HAT and my NAD 50.2 player. The DAC on the RPi board was not used. Connection Disruption I had a heck of a time getting the PS DAC to lock onto the USB signal. The USB output [...]
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