This DAC ,despite its sophisticated internal architecture is simple to attach to RPI4, no boring I2C control, OPA necessary, worked immediately with Volumio generic DC i2S driver. I connected it to TI 2x50 W TPA3116D2 chip amp. With two Magnat premium 102 speakers the set generates great sound, for a daily listening. Can compare to PCM5102A which I installed to another DIY DAC, both are good ones, Sabre seems to me better in high freq, IT in lower ones. May be its a little bit subjective view.