Seeing as it's been well over an hour now and mods (who have been online since) have kept the above reply to that video up, yet deleted mine because "You quoted a post that has been deleted. So your post must go too", the only logical explanation is they must have changed their mind (yet oddly they haven't reinstated mine or the original post). So I will repeat my post here:
Obviously the video uses a flawed methodology. (Which if you want to make it even more flawed and unscientific, you'll use a modded playback headphone with a random filter tuned by ear and so a frequency response not verified with industry standard measurements.) Having said that however, it is of some note that the video reviewer's blinded order of preference is generally consistent with the predicted preferences ratings of the headphones calculated from Sean Olive's algorithm:
1.
HE4XX -
89
2.
HE400SE /
HEX4 -
89 (score for the 400SE, but the X4 has
very similar frequency response, so its score would likely be very similar too)
3.
HE6SE -
81 (score for the V1, but again the V2 has a
similar frequency response, so score would likely be similar)
4.
Sundara - 94 (
81 as measured by Sean Olive, lower probably due to unit variation & seal differences, possibly because of the lack of cup swivel)
5.
HE5XX -
78
Also notable is the non-existent correlation between price and preference.
[Note to mods: If you deem a post to be off-topic, I'd advise moving it to a new thread, as previous mods have done, rather than just deleting it (resulting in the poster having to start from scratch), and doing so to similar posts no matter the member in order to maintain consistency and fairness. I have taken time here to collate and source the above objective, scientific information (in contrast to purely subjective, unscientific impressions that have remained up), which I believe to be relevant to a review of the HE400SE and considerations potential buyers may have about their sound and how it compares to models of a similar form factor from the same manufacturer. No transducer's sound quality can be properly judged in complete isolation, which is incidentally what the science tells us and why Sean Olive performs multi-way comparisons in Harman's blind listening tests. So expecting a review thread to be confined to comments only about the DUT without allowing comparisons with other models is in my opinion a futile, misguided and unscientific exercise.]