The quality of the product is good, that`s why I give it 5 stars, but unfortunatelly it doesn`t work with Raspberry Pi/Audiophonics ES9038Q2M. If you want to have an optical or coaxial S/PDIF input in your DIY streamer, then just buy an optical/coaxial spdif socket and connect it to spdif + ground pins (+5V for optical socket) on Audiophonics DAC. You must also take into account the necessity of adding two capacitors to avoid "reloading" effect (lags in audio via optical spdif input).