I think the rule of thumb for summit-fi now is that any headphone that does not explicitly encourage huge investment (both in terms of money and mind) into upstream gear as well as general technical audiophile / snake-oil knowledge, is not considered as summit-fi.
So it is more about the commitment one needs to give to a particular headphone in question, that determines whether or not the gear is considered top of the line; NOT about the performance or raw costs of headphones.
I guess from a discussion point of view that is fair, it puts a neat dividing line between casual audiophile hobbyists and the more hardcore types.






























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Beggars can't be choosers, you're already doing us a huge favor (at least in my opinion).