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Old 9th August 2020
Can you measure left and right separately from 20hz and 20khz.

Also a null that is a deep notch is preferable to a wide null but not as deep. When its a notch that deep it wiil go away if you move the mic and measure at a different spot. This is why just going by a frequency response in one spot at one point in time is not reliable. You never keep your head in one location when mixing or listening, This is why its best if you are using frequency response as a tool, to do many measurements around the listening position and make an average to see what the situation really is like.

By the way, your minimum phase group delay analysis shows its most likely the result of some form of SBIR.
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Help needed, Problems at 70Hz-screen-shot-2020-08-08-7.13.03-pm.jpg