I hope you’re not thinking I’m advocating a crude N-band equalizer to broadly boost the bass and reduce the treble to fix the HD800’s thin-ness and brightness. I’m talking about very precise filters that the community has optimized mathematically to fit the measured response to the ideal Harman target curve: https://www.audiosciencereview.com/forum/index.php?threads/s...
There is no reason scientifically to believe this wouldn’t work, other than the maximum driver excursion and distortion limits of the headphones. Fortunately the HD800S bass is extremely clean and undistorted, and they respond really well here. I’ve tried this with other headphones, and most cheaper headphones do struggle greatly, while the HD800S sub-bass is extremely impressive, clean, and powerful when EQ’ed in this way. And even more importantly, this works wonders to smooth out peaks in the treble that sound too harsh to be prior to EQ.
Even if it couldn’t be fixed with precise EQ though, this is still something we can measure objectively via max SPL and distortion vs frequency tests. For example, another highly regarded headphone is the Focal Clear, and it unfortunately has severe bass SPL / driver excursion limits that rules it out from being corrected in this way.
Of course it’s a fair criticism that such expensive headphones should require EQ at all! And the HD800S are indeed criticized in this way on ASR! Sadly though, it seems virtually all headphones do require EQ to sound remotely near their maximum possible sound quality potential, in terms of their physical capability. I personally love the HD800S for a number of reasons, but one of them is extreme comfort (which definitely is subjective), but I will be the first to admit their sound is painful to my ears until corrected with EQ.