On "truth". Truth isn't absolute. Truth is relative, a personal view, and sometimes a moving target. People around the world kill each other because they think their truths are absolute. The search for truth starts innocently enough, until it hardens to the point where the seeker can not resist telling others that their old ways are wrong (or placebo), and decides to impose his way as "the one true way". As Voltaire? said: "Cherish those who seek the truth but beware of those who find it." What irony.
Personal truths, or audio goal such as "fidelity", "euphonic", "objectivist" can be further broken down into additional sub-goals which are shared among those main goals. Terms of as "fidelity" can be vague if they are not well defined. Who's to say that that one cannot find euphony, from high fidelity, which correlates with certain objective measurements? In terms of "fidelity", what aspects of fidelity does one prize over the other? Perceived resolution? Smooth frequency response? Tonal balance? Lack of compression? Natural timbre? (note even the term "natural" is a relative or personal truth.)
Personally, I don't give a rat's ass provided that one's audio goal(s) are understood - that readers know where a person is coming from. Indicating specific gear as references for aspects of sound such as "natural", "muffled", "analytic", "organic" goes a long way toward helping others understand and allowing them to calibrate their own sensibilities appropriately. It helps to go out there and actually meet with real people to get a sense of where the bell curve lies in terms of "bright vs. not bright" or "etched vs. blunted." It also helps to have owned or borrowed a large variety of amps and DACs; and trying combinations thereof specifically with the HD800.
Those who have PM'd me know that I sometimes make their purchasing decisions even more difficult, because rarely do I say "buy X gear because it is the best". I try to take my own goals out of the equation and see where people are coming from. I often ask, what do you use? What do you not like about it? Then I reply consider gear A, but be concerned about aspect H; however also consider gear B, but be aware of aspect J.
In terms of the HD800, a headphone which I have had a love and late relationship, my approach is how do we take an otherwise dry and bright sounding headphone with almost infinite scalability, and turn in into something more listenable, while still retaining its german toilet aspects (ability to reproduce low level information). And then it's a matter of trade offs. I understand why people like the WA2 or Leben with the HD800; but I feel the trade off in lost speed, resolution, attack is too much. Way too much. The GSX2 is on the lean and fast sounding side of the spectrum in the universe of amps, but these characteristics do nothing to ameliorate to HD800's dry and bright sounding nature. However, none of what I think matters if my own goals (preferences) are different from yours. But at least I've stated (or at least it should be fairly obvious by now), what my goals and references are so one can calibrate accordingly.
The conversation ends when one claims to speak "truth".
Or hasn't heard (or for those "objectivists" measured) enough stuff to know the difference, e.g. "I've heard craptastic tube amp with HD800, therefore all tube amps suck" ; "tube amps sounds good because have artificially high levels of even harmonic distortion" (when they haven't measured any tube amps, or even worse, ignore actual measurements showing none such behavior); or amp X is totally transparent and wire-with-gain.