The preamp Rotel RC-1590 has a built-in DAC based on chip AKM 4495. I am not sure at 100% about the model. Anybody knows how could native DSD be played from a USB attached Linux box (native Linux, DietPi, RoPieee, etc).?
I am not sure about this, but this AKM chip can be the same that use the Teac UD-503 unit.s