Yeah, it does require a little bit more extra volume - not in a sense that it's hard to drive i.e. requires more power to properly saturate sound, you simply have to turn the volume up, that's because Black's SPL is rather low. And if you are looking to get more V-shaped sound from Blacks adding volume is natural reflex - it has to do with fletcher munson curve I get what you mean. I compared Blacks with our whole line up when designing it and I felt like details were always there, just not as upfront/forward. Analogy I came up with is that other IEMs try to cram in and push details on the stage, while Blacks create an extra space on the stage and expand it for all details to fit. At least that's how I hear it and how I would describe it. Regarding the tuning, indeed Blacks are not tuned for super crispy and airy treble, nor for ultimate selectivity/resolution, Blacks are designed for fatigue-free long listen with tone and timbre in mind first.