In headphones there is only one driver per chanel. It's task is to play every tone, from 20 Hz to 20 KHz, how would you call measure for transition from one tone to other?Sorry, there is no such thing as "speed." Typically this is lack of deep bass that people call "speed." Anyway, my conclusion is not far from yours in the review:
Yea, your conclusion isn't far from my mine indeed, but reading most of other people's posts here someone would make a conclusion that this headphones are fail. Probably the people who never had a chance to put them on their heads and just blindly read your measurements. I'm not saying that they are wrong, just that there is more things happening sonically which can't be measured, but can be heard.