If the UX-1 does not have a coaxial digital input, you cannot access its DAC. You need either a separate DAC or a CD player with a coaxial digital in to hear the Wadia at its best, since the main point of the Wadia is to extract the digital signal from the iPod, thereby bypassing the iPod's internal DAC. I believe the RCA outputs on the Wadia are just passing along the analogue signal from the iPod. You do not bypass the iPod's internal DAC, so the 170i is just acting like an expensive dock.