I can say this about comparing music from CDs vs SSD files. On my system, which I feel is very resolving now, they sound very close to the same. I am a bit chagrined about that considering I ripped all of my CDs using a $40 DVD/CD Reader/writer attached to my MacBook Pro using DBPowerAmp's CD ripper. I got me a CD Transport that uses vacuum tubes on the output. This transport has several output options: BNC, Coaxial, optical and it also can upsample CDs to 128kHz DSD with output through either I2S or 3 BNC connectors (I think this output is SS). My DAC also uses vacuum tubes on the output plus it has a vacuum tube regulated power supply. It sounds very nice. The 3 BNC output/input sounds the best and the I2S is very nearly identical. I was blown away with the sound of CDs on my new system. I hear details in my CDs now that I had never heard before. It dispelled all of my notions about the limitations of CDs. Plus I can listen to my CDs all day long. Not like before where after one disc or so I either switched to vinyl or walked away. So after getting the music server I listened back and forth and I cannot really tell much difference between spinning the CD and playing the FLAC. Still, I enjoy spinning the CDs but sitting in my chair with my iPad and getting the same and even better sound with hi res is going to make me lazy I think.