Woofer NearField measurements, no SPL drop in vent tuning frequency.

KyrkV

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Hello, I am trying to take woofer and port nearfield measurements, to compare them to the modeled response, but to my surprise, the woofer's measurement doesn't exhibit the characteristic drop in SPL at the port tuning frequency. Sum of port and woofer does result in estimated response though.
Why is that? Have I measured wrong (mic was was mm away from the cone and in mm inside the port, centered in both cases. Is there any other explanation? Same behavior measured in the second driver.

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