I guess I'm just not following were you are saying I stated that at
Here is what I wrote on the matter in the LLT Explained thread:
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By fine adjusting the enclosure volume and tune, you can mold an anechoic FR that is flat throughout the bulk of the bass range with a shallow roll off starting at ~25-30hz, extending down to the tuning point, with the 4th order roll off occurring somewhere below that. This shallow roll off area is key, as most rooms typically yield about 4-8db of room gain/octave.
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- FR with a ~4db/octave rolloff between the tuning frequency and the lowest room node
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In "average" sized rooms, gain starts to kick in ~25-30hz, with it starting even lower in larger rooms. So unless you have ~5db/octave gain in a really small room where it would kick in starting at 40hz, I definitely would not aim to be 9db down at 20hz.