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So if you use the RCA outs, the tube is in the output and you get tube coloration - great for some CDs and bad for others.
Keep in mine that the source component, being early in your component chain has an emphasized effect on the sound since any problems there are amplified twice in the second part of the chain - your preamp and then your amplifier. That is why I don't like a tubed source - tube coloration there is amplified later.
I only like a solid state CD source, with Class A and no opamps in its output.
Then I add some timbral body to the source signal with a tube preamp, and then I restore detail, focused imagery, dynamics, transient impact, and deep and well defined bass with a solid state amp. I can vary the added tone body (richness, liquidity. lushness, etc.) by tube changes in my preamp while still having the great solid state characteristics in my amp.
This approach is in both my home speaker and headphone systems. In my headphone amp, it is a hybrid design that uses 3 6NS7 tubes in a tube pre-amp or input stage then uses Toshiba MOSFETS in a solid state amp or output stage. I change tubes to dial in the amount of timbral body and lushness I want while still getting the graet solid state sound characteristics. I can go from totally natural and realsitic sound to totally enjoyable but colored tube sound, while not having the tone leanness you get with any solid state equipment made.
For me, there is no better way, and I have audioned systems costing more than $100,000.
The E5 gives me very natural and realistic timbre, great image focus with proper placement, fore and aft, of instruments in the soundstage, and a minimum of digital hash or harshness. And at a insanely low price!