Some thoughts: If upsampling to quad speed DSD using HQ player is the cat's meow.....then why do we need a Nadac? Is Ravenna and Ethernet really THE way to go......or could you use a great usb to I2S converter with hardwired I2S cable on the output and plug into a modified Gustard X20 and get as good of sound?!?!?!? Maybe just double speed DSD directly into the usb input of the Gustard would be amazing! The Nadac is probably one ESS DAC chip and a couple of op amps on the output. The Gustard has 2 ESS DACs and I am going to install one super transparent discrete stage on the output of each phase.....so the Gustard will be better in DACsville and outputstageville. Could it compete with the Nadac? We shall see. The Nadac is $10,500, The Gustard X20 with mods less than $2000....optionally, add another $500 or so for state of the art I2S converter and we might have something really, really serious.