This also brings up the question of: Does a zero distortion, flat frequency response, sound better than a response with peaks, dips, and slight distortion? Take for example the tube amp discussion. They (tube amps) generate 2'nd harmonic distortion in the criticial midrange frequencies, which some people desire. Also consider that people think drivers with higher distortion sound louder than drivers with very low distortion. They might not be louder, but they sound louder. Polk once designed a speaker with a perfectly flat frequency response, and when they compared that speaker to one of their current designs (at the time), the pannel of listeners preferred the speaker without the perfectly flat response. My personal favorite midrange is made by Seas. From recent Klipple tests in Voice Coil magazine it should by no means be king-ding-a-ling of the midrange area, but I prefer the sound of many Seas midranges to other competitive drivers. To me, there's more to consider than only numbers when designing a speaker. However, you can't ignore numbers when designing, so it's a bit of a catch twentytwo.