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Allo Digione What is it? It is a transport for RaspberryPi 3 with Coax/BNC out. If your dac supports this input, read on. There are two flavours: One is a PI-hat https://allo.com/sparky/digione.html Another one a complete streamer/player assembled: https://allo.com/sparky/digione-player.html Darko's review: http://www.digitalaudioreview.net/2017/08/allos-digione-pulls-five-star-sound-quality-from-the-raspberry-pi/ Volumio's recent review: https://volumio.org/allo-digione-player-probably-best-volumio-based-spdif-transport/ Personal take: My dac happen to have galvanically isolated usb, so it sounds heavenly as it is. But sometimes RaspberryPi has been a bottleneck as these usb buffer overran/underran clipping noises leaking into the chain. I decided to try a DIGIONE, to see if it would illuminate this problem. Yes, RPI's usb was the culprit. After installing the DIGIONE on my RPI and selecting I2S Digione in Volumio config, my system sounds as good as before, without the usb induced artifacts.
Have read all sorts of articles and forums, about reflections in a Spdif / word.clock cables. 50% of the Electro Engineers articles state that you should use as short word.clock cable as possible to mimic as if it was one unit on the same cirut board between a D/A / A/D converter and a master clock generator. And 50% states buy messauring the the reflection of the word signal will bounce between the transreciver and master clock generator if the cable is shorter than 1.5 meters in length, and you will get higher jitter and phase loops because of the reflections. This is stated for SPDIF , but i wounder if it the same roule for a word.clock signal transfered in a BNC 75 Ohm cable? I am about to upgrade my word.clock cables to pro versions but befor i buy i wanted some clarification about this. Hope someone with knowlage and experience can help out.