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2º De ser las frecuencias altas las mas criticas, ¿por que Dirac Live en su versión básica que cuesta 250 Eur, SOLO corrige las "frecuencias bajas" desde 20hz hasta 500hz?, me temo que te falta mucho conocimiento y bastante humildad para reconocerlo.
Estás quedando como Cagancho en Almagro, compañero. Aun peor, delegando tus "conocimientos" en los criterios comerciales de Dirac...

Mira, aquí tienes una gráfica de un estudio que (mediante pruebas ciegas) comprueba cómo notamos la distorsión según la frecuencia del sonido. Cómo seremos de "sordos" con las bajas frecuencias que a 40Hz necesitamos una distorsión ¡del 100%! para notar algo



La conclusión del estudio:
Axiom's tests of a wide range of male and female listeners of various ages with normal hearing showed that low-frequency distortion from a subwoofer or wide-range speaker with music signals is undetectable until it reaches gross levels approaching or exceeding the music playback levels. Only in the midrange does our hearing threshold for distortion detection become more acute. For detecting distortion at levels of less than 10%, the test frequencies had to be greater than 500 Hz. At 40 Hz, listeners accepted 100% distortion before they complained. The noise test tones had to reach 8,000 Hz and above before 1% distortion became audible, such is the masking effect of music. Anecdotal reports of listeners' ability to hear low frequency distortion with music programming are unsupported by the Axiom tests, at least until the distortion meets or exceeds the actual music playback level. These results indicate that the where of distortionat what frequency it occurs is at least as important as the how much or overall level of distortion. For the designer, this presents an interesting paradox to beware of: Audible distortion may increase if distortion is lowered at the price of raising its occurrence frequency.
https://www.axiomaudio.com/blog/distortion