I took a significant amount of time to donate some audio expertise to help those who aren't yet audio snobs (anaxilus). I could have put this on Head-Fi but thought there might be less sheep here.
Just because what I have described doesn't resonate with the status quo, it doesn't mean it's incorrect or trolling.

I don’t know if you’ve looked around here much, but EQ has been advocated my many, including myself. Some have built passive EQ circuits for certain headphones since not all people use computer sources with handy digital EQ.

Let me tell you my background - I'm an engineer, an inventor, an IT technician, an Audio Visual supplier / system designer / installer, a custom cable builder, and I design & build homes on occasion.

Zerodefex - Real mature! The summary of my experience was provided to substantiate my advice, not to impress you or anyone else.

Lots of us fuckers here have done a lot of cool shit in their lives. They don’t advertise it. Citing credentials gets you tarred and feathered here. This is not Head-Fi. We are not stupid. It's best to substantiate your advice with by gaining respect and trust of the members here over time.

When comparing frequency bands with a sine wave at 80dB, you should hear them at the same level regardless of whether a microphone, picking up a small pin-point location, measures differently.

Fletcher-Munson or actually the better ISO 226 says otherwise. Perceived loudness drops off after 3kHz. This is why the test tone approach doesn't work, unless one has been trained to know how the loudness levels are supposed to be at for each frequency. Also 80db test tones are annoying. IMO, you've tweaked the mid to upper treble of the HD800 too loud. Not surprising because thought perceived loudness levels were supposed to be the same which they are not.

Regarding valve amplifiers - I'm not going to enter the never ending debate of tube vs ss except to say that it takes a very good, large, expensive valve amp to match a much cheaper, smaller properly designed solid state in many technicalities.

Why do you say you are not going to enter the debate, and then proceed to enter the debate? Lots of very good tube amps with clarity, speed, resolution: Schiit Valhalla. Torpedo. Crack (although higher output Z). S7. Even used ZDs. From $200-$1000. Fairly cheap in the universe of highly inflated prices of 2014.

The point I was making is that we need not choose amplifiers and cables for their equalisation effect when we can do it simply and often at zero cost.

No shit Sherlock. Get to know us better. Most of us here don’t advocate tube amps or cables for HD800 for the primary purpose of EQing or tonally shaping them. We’ve suggested mods to lessen the deleterious effects of the HD800 cup design (computer simulated by arnaud, measured/corroborated by us.) Also, EQ doesn't solve the cup resonance issue, so HD800 does not respond to EQ as well as other headphones. We advocate tube amps (cheap small to expensive large) primarily to take full advantage of the HD800’s resolution and dynamic capabilities. We discourage tube amps which cause deleterous effects, mud, syrup, distortion to HD800.

And if people wanted to tonally color their HD800 via amps or cables, we are not going to stop them. In fact, we may even help them - according to how much they wanted to spend and what effect they wanted to achieve. Who are we to say?

There wouldn't have been a problem if you had simply suggested the use of EQ with the HD800 without making erroneous assumptions, trying to act as the smartest person in the room, and being a self-righteous cocksucker trying to prevent stupid people from wasting their money on cables or tube amps.

Doesn't that like, u know, give ya da flu? I stopped w/ flu shots cuz they gave me the flu and were usually the wrong strain meaning I could end up with two flus for one flu season. -

U ar gitten the rong shot Matey. The 1 i git makes mi spilling impruv!  I think that shot is making me feel like 

#//^/#&&/#$@!!!OFG!!!!!

You're gonna die from a concoction of alien testicles, mercury, aluminium, animal poop, Jamal chicken w/ hot sauce special.......

Spaghetti.
That's no problem! That's pretty much what they serve for lunch where I work, so I be immune. 

Wow! What egos Marvey & Anaxilus have!

Clearly, you revert to abuse, aggression, insults, threats and false claims when someone here doesn't resonate with your opinions.

I'm not going to get sucked in to your immature flame war.

I'm not going to get sucked in to your immature flame war.

Umm, yeah. You realized you could have stopped 15 posts ago.

Wow! What egos Marvey & Anaxilus have!

Clearly, you revert to abuse, aggression, insults, threats and false claims when someone here doesn't resonate with your opinions.

Agreed, we could have been nicer to you. My ego gets really pissed with the following:

1) Pretending that your post was a huge sacrifice of your time and resources and attacking people for no reason. You veered off course with this: "I took a significant amount of time to donate some audio expertise to help those who aren't yet audio snobs (anaxilus)." You set the tone the thread was going to take.

2) Passive aggressive rhetorical techniques, i.e. suggesting you won't get involved with flame wars when you yourself play a large part in fanning the flames; saying you don't want to enter debates about tube amps and then proceeding to make your argument; framing your observations as authoritative, yet now claiming that they were in fact simply "opinions" that Anax and I disagree with.

3) Talking about things you lack experience in and then making broad assertions (tube amps sound slow with transient response issues, effects of cables, etc.); and then citing your accomplishments and credentials as if you were some sort of expert. Why do I strongly suspect you have never heard a tube amp? Even a "distorted" tube amp.

4) Not knowing WTF are you talking about - spreading misinformation - which is different from opinion: shortening your stock HD800 cable which is a waste of time; and suggesting EQ to HD800 to increase top octave (there's already slightly too much air) and pushing down a large swatch of upper mids (which is the reverse of what should be done with the exception of the 6k trouble spot). This EQ scheme based on your not understanding that our perception of loudness is not linear. (Again, Fletcher-Munson, ISO). In other words, your suggestions would make the HD800 sound even more shitty.

5) Advertising your business Elmura Audio without first asking.

6) Having the gaul to report zdfx's post, after you have already fanned the flames.

7) Playing victim.

Opinions are great. Different opinions are respected here. If you framed what you said as an opinion, everyone would have been fine with it. But you came in, derided Anaxilus, acted like an authority listing all your credentials, and on top of that, you offered people wrong advice. All made worse by the fact that you did not introduce yourself or fill in your profile so any of us would have a clue what perspective you were coming from. What did you think was going to happen to you? Hugs and kisses?

This is what I think. I don't think that you came in with good intentions. I think you came in to troll.

Mmmm... did not pay attention at that Elmura Audio stuffs. Not good.

Like I said at IF Elmura, take a little bit of time off and avoid further confrontation. Take it easy, sip some margaritas or a few beers and let it go.