The midi range, not the tweeter, is the most important driver in a speaker.

" [The Yamaha NS-10’s] are too revealing not distorting. They are used by the best recording studios. They could choose any speaker they like."

The NS-10 is not an accurate speaker, but its value is this: If the mix sounds good on the NS-10, then it will sound good on just about anything. This makes it a useful tool, but it is never the only tool in the kit.

Duke

I agree that the midrange region matters most, but not necessarily that the midrange driver itself matters most.  Imo how well the midrange driver works with its partners, the woofer & tweeter, matters more than the individual excellence viewed in isolation of any one of them.

(To extend that line of thinking, imo how well a speaker system works with its partners, the amp and the room, matters more than its individual excellence viewed in isolation.)

Duke