The premise that myths are false by definition reflects a superficial understanding and use of that word. Some simple research would reveal to you that myths are deeply textured and nuanced cultural narratives, the truth of which can be nearly impossible to ascertain--myth is comprised of both truth and fiction, often intertwined. Accordingly myths can be both true and false...simultaneously.
And lest you think that myths are solely the province of the ancient Greeks, read some Barthes or similar. We engage in myth all the time here. I think it is particularly noticeable on both sides of the great (I use that word loosely) burn-in and cable debates. Similarly, here, the myth of the bassless 701 is a good example. I've heard this phone dozens of times in all kinds of setups. Most of the time I think it sucks. Its anemic bass compared to other mid-to-high end phones is startling to me. But I have heard it sound good, as noted above, out of the big HR amps.
So which is it? Do they lack bass or not? The answer is who the hell knows. Maybe the bass is great, but only with a very certain few amps. Or maybe it does, indeed, suck, but I was in a good mood (read drunk if Tyll was around) each time I heard the 701 out of HR amps. Regardless, I would be inclined to say yes they lack sufficient bass to be fully satisfying, if asked. And there we have a myth. In my perception, the bass of the K701 is anemic. But I also have heard it sound good on a couple of occasions. How do I reconcile these two states? I tend to take the couple of dozen times they've sounded lousy to me and think that's more in line with the "truth." As I tell others that I think the 701 lacks bass, I perpetuate this myth, which has embedded in it both truth and falsehood.
People here like to speak in absolutes. "It has great bass; you just have the wrong amp!" or "cables make a difference, you just can't hear it!" Myths. Opinion as fact. Both true and untrue. Here, it appears that what you really meant instead of "myths" was "falsehoods." If that's the case, then that is what should have been stated. Words are important.
And there is plenty of room for reasonable minds to differ on my interpretation of myth. Lord knows there are plenty of people smarter than me who have made it their job to write about and discuss such things. But that "myth" is a word loaded with cultural and narrative significance that transcends merely whether a myth is true or false cannot reasonably be debated.
When we're talking about a headphone, the word myth comes to mean false beliefs and conclusions that stem from people's inability to get the proper synergy with the headphone, their taste in music and their snobbery (too cheap to be good mentality).