Question on U1 and U1 Mini

A question for you,

  1. I found when playing Hi-Res files that when the volume of my dac/preamp is low I hear a lot of noise to even distortion, now I have been able to solve this by setting the Simple Rate Conversion to Enable in Roon, I find this strange.

  2. Is it disadvantageous to have the Lumin U1mine connected to the dac/preamp with both AES/ EBU and USB or should I not do this?