I'm doing some FIR filters for my speakers and i'm using REW and rePhase for this purpose. However i found out that depending on the time reference i've use i get very different results of the Phase and the Impulse Response. Attached are screenshots. Both measurements are done using UMIK and are done on the exact same location. The only difference is the timing reference method. Why i'm getting such difference and which one i should trust?
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