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The loudness contour suggests that for low level listening a "fun" sounding headphone (with extra bass and treble) would sound more correct than a (measured) neutral one, since the neutral headphone will sound lean and lack sparkle at low levels because of said contour. This doesn't seem to be the case with the SR-009: It has a slightly lowered the bass response and no treble peak (source: Inner Fidelity).
Oh reading my previous post, I can see where your comment stems from. I was indeed incorrect when I meant a "warmer" phone like the 007 needs to be pushed higher in volume to sound neutral. It's the opposite, and, as you said, treble would need to also be tilted to truly make it perceived as neutral at that low volume...
Thank you for straightening this up .