It's not about being trained, it's just that you get used to the sound signature you ear every day. Try to only listen to one particular piece of gear for a few days and then switch to something different, you will be able to pinpoint all the differences.You guys must have really trained ears. I usually have a real hard time to differentiate from a dongle to another. It is hard to quantify the differences from the RU6 to the Ibasso D03 Pro and even the Apple dongle when used alone with the iPhone. I think I prefer the RU6 for some reason that I cannot explain but that can also only be placebo. The only thing I know for sure is that I prefer the NOS option instead of the OS. Again, cannot quantify why.
The RU6, double amping with my Rupert Neve RNHP is such a wonderful sound with any of my Headphones. I don't know if it is the amp or the RU6, or both together (the RU6 seems to be an easy pairing with mostly anything from what I have read) but I love the sound that comes out of that system. I have a SMSL DAC on the way so it will be very exciting to compare a dedicated DAC (even if inexpensive) to the RU6 in that position. So exciting!
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