So, do you own a pair or have you ever tried it? On your profile you put the AKG K702, HD 560, HD 600 and Hifiman HE4Xx, which are all nice but clearly inferior headphones. If you are just judging by the measurements then you should be careful as these convey on headphones much less then on amps or DACs. I take your comment as a rather superficial judgement that doesn't carry much weight. If the bass after EQ is a weakess, I would like to have more of this weakness please.
In order to have a significant/physical sensation of bass impact, the air volume between the driver and your ear has to be fixed. Even a small amount of leakage will decrease the sense of impact because the driver can't physically push a large amount of air. It also doesn't help that the HD800's driver resonates at around 100 Hz and thus is less proficient at reproducing frequencies below that point.
HD560s, not HD560. Don't start coming out with even more stuff that you can't substantiate - ie the headphones in my sig "clearly inferior" to an HD800s, the HD560s actually measures better for instance. Nope, I've never tried the HD800s, and remember, I didn't say the HD800s was a bad headphone, I was just saying that the bass is "inferior" (to use your word) to a fair few headphones in terms of it's distortion measurements - I'm just stating facts. I only brought it up initially because you implied in one of your posts that HD800(s) was low distortion in the bass. I'd quite like to try the HD800s for it's lauded soundstage abilities, that's it's main draw.
Big Iron!
The HD800 has an interesting gimmick which is the artificially enhanced sound stage. It almost sounds like what you get if you set two speakers too wide apart, but in headphone terms. It's an interesting quirk but there are drawbacks for sure. Imaging or clarity isn't as precise as it could be for one thing.
Seriously, clarity isn't precise? What is clarity except FR? Use EQ. And I can't see how imaging shouldn't be excellent as well. The soundsatge is not a quirk or a gimmick, but a quality that brings the listener closer to the loudspeaker or even live listening experience. How should that not be desirable? I personally find it a pitty and a shame that apparently no other headphone came up with something comparable yet. The HD 800 came out in 2009, there was a lot of time to research.
HD 560s or 560, whatever. I don't know in which respect you state that it measures better than the HD800, maybe in distortion? If you mean FR, than yes, before EQ the 5560s adheres better to the Harman curve, but after EQ (this is what counts for me), the HD800 (S) has a better rating according to the data of oratory. So this would be a clear example where I definitely prefer the worse measuring gear, because firstly, for me there is no audible distortion in the HD800 and secondly, the sound is leagues better, it is no comparison to the HD 560s or 600/650/660/6XX.
No, firstly, all headphones have different resonances and different levels of distortion, so EQ does never work perfectly and the outcome is not the same for every individual headphone. You can for example check the result of EQ for various headphones here: https://www.reddit.com/r/oratory1990/wiki/index/list_of_presets/.
Are you serious? You are talking about a roll-off at 10Hz? Do you know how 10 Hz sound? No? Because you can't hear it. At 20Hz the EQ is spot on the Harman curve, so you are chasing imaginary things. I have also the planar Sundara, with EQ also good amount of bass, but nothing different from the HD800. I think you are propagating myths.
When I add a bass shelf to the Aeon 2 Closed, I can hear it but I can't feel it. The same shelf on my LCD-5 and LCD-XC vibrates the earpads and my skull.
Mine rumbles too. But it's nothing compared to any of the LCD headphones I own. Those also have flat bass out of the box, like every planar before the Stealth / Expanse.
