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Is frequency-response calibration related to phase/timing calibration?
The precise phase/timing calibration that DEQX pioneered goes hand-in-hand with its frequency-response calibration where frequency-response errors imply group-delay errors. Traditional EQ provides frequency-response compensation with a broad brush adjusting all frequencies in the vicinity whether they need it or not, nor does such EQ maintain linear-phase.
DEQX corrects phase and frequency response at thousands of frequencies only to the extent specified by the anechoic speaker measurements while maintaining or correcting phase accuracy. This simply can’t be done in the analog domain.