The thing is, even the most linear microphones in this world are not absolute linear, +/-3dB is actually not that unusual for a top class microphone, I worked as a sound engineer so I would know (I really hate quoting that, but it seems if one doesn't, one doesn't get taken seriously or could be disregarded as a troll). That's why even well recorded classical music needed to be EQed afterwards to compensate for the inaccuracy of the microphones, placement or even signal degradations because of long cables etc. I'm not doubting your brother's expertise in making accurate recording, but using that to judge the accuracy of a pair of headphones is a bit unfair and that's why I said the most simple and effective way to do it is to compare them with a pair of reference monitors. They may not be as accurate as 100% real life but saying that the LCD-2s are not neutral seems to me a bit pointless because I don't think there are many or any headphones around that are more accurate.
I personally don't use EQ with my headphones because I believe that a lot of good headphones were designed deliberately to have a certain sound signature, like the HD800s, whereas the LCD-2s were designed to sound as accurate as possible, so using EQ to change the sound signature seems to me as defeating the intentions of the headphones designers.
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I agree on some of that. Fact is, my brother doesn´t have a tube preamp to color the sound...
And we talk about some minor UNlinearity. But i have to lower the bass on the lcd-2 by 3db, and that´s a range that extends from 10hz to 1khz. My brother´s mic is much more linear than that. He also know about the distance, but thank you for writing that. He studies in a music school, and is being trained to be an audio technician.
But about the final sentence, let´s not say stupid things, that is, i never said that EQ is everything. Or else why do YOU think i bought the LCD-2 in the first place, instead of some cheapos in the super market? Don´t want to add anything to that, as you can get to the conclusion.