Freqphase is just a fancy marketing term. It could very well be that that JH13FP has excellent phase response, but it's debatable whether phase response is that important to sonics, particularly with music. Most music we listen to will have phase errors introduced at the microphone, mixing console, mastering, etc. EQ will always mess up phase response, and EQ can and is often applied at each step of music production.
The UERM have an incredibly "messed up" phase response. Most three to four way speakers using rigid materials will have messed up phase responses because of the crossovers required to make them work. The speaker manufacturer Thiel also believes in the "freqphase" concept for lack of a better term. Unfortunately, their latest speaker I heard sounded like someone banging aluminum pots and pans together - probably because Thiel prioritized "coherent phase" over a crossover design with a steep enough slope to eliminate the higher frequency resonances on their metal drivers (all speculation on my part without measurements.)
BTW. Some of the Monster IEMs (Turbine, Lady Gaga, Miles Davis, etc.) have excellent, that is almost perfect, phase response characteristics. Better than the JH13FP.
The JH13FP is awesome because it uses "Awesome", not "Freqphase".
