LCD-2 is perceived as warm due to the shelf from 2k onwards. There is rapid drop from 1k to 2k, whereupon it maintains a reasonably steady level.
http://www.innerfidelity.com/images/AudezeLCD2.pdf. The shelf is less severe on later measurements and models, but still exists. I am familiar with acoustic instruments- these properties make certain acoustic instruments sound thin and lifeless.
Look at the distortion graph on the same graph you posted. The reason why people complain about their "bass" is too distorted to qualify as bass. A headphone for studio work shouldn't have >5 % distortion from bass to mids.
That as well, but there is more to it - you can correct the shelf and yet you cannot remove the resolve it has in the mirange - whereas many feel that this accurate tracking of the midband is some sort of a coloration and "error" that cannot be EQ'd out.
I've played around with EQ for long enough to know that the original PX100s are more resolving than the famous HD650 up from treble down through mids. The old Koss Portapros also does not show weakness here...I am suspecting a lot of the new offerings are weak here - regardless of how they voice the output.
I think it is a new and exciting time for audio in general, the bringing to light that the ideal speaker balance tilts downwards - I have done this with my speakers with an EQ for tilt exactly as described, and was unaware that this is actually the ideal response. I started doing his after I got my HD650s.
At least one well know luxury car manufacture is following the straight vertical neutral school of thought. Their upmarket fancy bang and olufson branded stereo even has motorised tweeter that pops up from the dash when turned on. It sounds very nice and incredibly clear - but same old, same old - tilt the response downwards and once again the midrange resolve does not match the top end resolve. Nothing new to talk about in car audio either.
I just fear that manufacturers will feel the need to tilt their reponses down ward without the realisation of how damaging this is to hi-fi if the midrange resolve is not brought up to match the top-end resolve (blame CD). This excellent development in top-end resolve has far surpassed the development of drivers with midrange resolve.
Only once, have I ever walked in to a hi-fi shop and the music playing was just soul crushing, a full room of goodness in the midrange, supplemented by a non overpowering complimentary bass, a top end so extended and smooth but not overpowering, the incredible nature of that kind of ambience. Naturally I never bothered checking which speaker was doing this as I had assumed, I will never be able to afford whatever it is that was playing. Maybe I was wrong, maybe I can afford such a good system. Maybe the corporate empire can make it affordable by people like me?