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The red line is the nearfield response (without room reinforcement) curve for the vent.

The blue line is the nearfield response (without room reinforcement) curve for the woofer

And the yellow line is the combined nearfield responses of the vent and woofer.

Note that the Sampan FTL's low frequency response is very smooth and extremely linear varying only by 3.5 dB from 40 Hz to 1 kHz. (each small square represents a height of 2.5 dB)