Maybe you have different musical equipment experiences and bias as to what you think is a correct frequency response than people like myself who have dedicated home theater set ups with measured flat responce down to below 30 hz.
Well perhaps that's it - HT as a standard, the EQ of HT is certainly not flat for music.
I started going with my father to the BSO when I was about 9, He bought a pair of Quad ESL's when I was 12, Later lived in Chicago and hit the other most legendary Hall in the US. Also learned how to play guitar and piano - poorly. Plenty of time spent on the other side - saw 3 Pink Floyd concerts before they put out DSOM. Saw Miles Davis's return to the stage in Boston, etc. and so on. Owned a lot of equipment with an EQ pointed at music - Verity Parsifals (25Hz-50K), various Pass amps and pre-amps, Koetsu and other top cartridges, a good deal of ASC tube traps. Earlier ML CLS IIz with Gradient subs - plenty of correct bass.
The LCD-2c is the only headphone I own that even comes close to reproducing bass with the accuracy and range of my home theater. All of my other headphones in my profile dont even come close. I’m just guessing you’ve never had the privalege of hearing truly high end dedicated theater rooms that are sound treated and calibrated.
I sold, was investor in, and friends of High End Audio folks from 1977-2005. I've heard lots including $50k+ HT set-ups. Not my cup of tea for music. Nice for movies.
If so then you would not have the opinion the lcd2c produces bass incorrectly.
I have more experience than most people here, certainly enough to opine on the quality of LCD2's with fuzzor mod built in 2014. I've got a nice front end (see sig). I had another guy bring over his LCD's w/ fuzzor mod and it wasn't a defective sample.
I agree with Betula that you might be letting your personal preferences influence your understanding of true full range sound.
Perhaps it is your defensive attitude that refuses to grant that I am qualified to render a verdict and it doesn't comport with yours.
Most headphones meaning the vast majority of them are not capable of producing truly full range sound like you would experience with a ht setup consisting of multiple speakers and dedicated subs. The lcd2c is one of the few that comes close.
The music lives in the mids. The LCD2's upper mids are flawed by being reticent in output. The lower mids are chestier than they should be. Right there they are done. But tossing in the dropping upper octave robbing the music of overtones and the bass that predominates beyond what the recording calls for -- they just don't qualify as high quality head phones to me. As I define audio playback wending from my fathers Quad's, to my Maggie MG-1, MG-2, 3.3, DQ-10 (with sub, with cheap ribbon tweet, then the right one), etc.
If the fans here prefer HT or Bose 901's or whatever - fine, but trying to denigrate what I know just shows how unsure you must be of your conclusions.