My Bluesound Node 2i and Cambridge Audio CXC CD transport are both connected to my dac via coax. Music from the CXC sounds clearer than flac rips of the same CDs from Roon to the Node 2i. Could this be because the Node 2i is noisier than the CXC? I do hear buzzing when plugging headphones into the 2i. Would a power cable upgrade help the 2i?