Well great, now my posts are considered attacks and trolling, without any reasons or examples provided.
I'll leave the hallucinogenics in peace, but first I have to clear up some stupidity. I'll ignore the call of trolling, I'll ignore the obviously defensive response, but to spread misinformation and, after a certain point, stupidity (aka trolling) to newer members who may see this thread and use it as a decision maker is just wrong.
So many on hype-fi selectively read and warp whatever suits them, and when it is pointed out, it is called something offensive, as if your beliefs are a part of you.
Selective absorption:
Again, for their flagship T1s, there is a reason that beyerdynamic picked a 600 ohm driver.
"The increased efficiency also leaves the T 1 with greater power reserves for dynamic, undistorted sound and nearly lossless conversion of electric signals into sound waves. The extremely lightweight 600 Ohm voice coil provides transparency and perfect impulse fidelity."
An unclouded person could identify all similarities and differences when comparing something, then make a logical conclusion about the subject. In this example, it is assumed that because the flagship model uses a 600 ohm coil described as lightweight, that because it is juxtaposed into a lesser model, it still retains the same characteristics. You have not considered two vital characteristics of the statement and the headphone.
Coming from a headphone manufacturer's site, one could assume that they want to portray their products in the best possible light. Remove the words 600 ohm from the statement. What does it sound like now? An advertisement. What is '600 ohm' in the context of that statement? An adjective, not a noun. This combination provides zero information and draws attention from the actual reason that it is 600 ohms.
What is the difference between the T1 and DT880? What is the gigantic selling point that beyer shoves into our faces over and over again? 1.2 tesla. If an amp can drive 300 ohm headphones with moderate efficiency levels at 9 of the clock which is far too high, then one could assume that the same amp driving a 300 ohm headphone with an industry leading power conversion would blow your ears. Why are headphones 600 ohms in the first place? Beyerdynamic is a great microphone manufacturer, my recording artist friends use them (I have nothing to compare it to actually). Older, more powerful equipment in studios used 600 ohm headphones. K272 and whatever that really popular studio headphone was both come in 600 ohm versions.
Now we come to the headroom graph. I'll spare any talk of measurement errors as I tend to trust the graph far more than many other sources of information. Looking at the differences, one would ask oneself what is the source of the difference. Of course, many 'respected' hype-fiers will jump to the conclusion that it is because of the change in impedance. Such a difference is so small that two 'confirmed to be the same' headphones (some sony ones, check the thread) had a larger variation than the two beyers. This leads to the last plausible conclusion: product variance. In a field where measurements are so difficult to take accurately, there's a large possibility that the differences can be attributed to factory differences. This all is assuming that headroom's method of measurement is reliable (which we will accept).
The last thing that cemented my belief is the word of a headphone store owner I trust far more than the entire of hype-fi put together. His brutally honest personality allows him to give far less biased statements than any audiophile I have seen. His forum is evidence. He said to me simply, 'they are the same', and that was enough for me.
To finish off, I will state that I have supplied reasons and examples for my arguments. I have received in return, half written sentences and phrases, excessive abbreviations and smilies, forgiving my first point.
I will get out before the mushrooms wear off, with one phrase that you are free to interpret in any way you like, possibly even, the way I meant to portray it but can't due to an inability to offer one of my digits on the internet.
Nice.