SMD DD-1 - Where Do I Set My Infrasonic (Subsonic) Filter

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Where do I set my infrasonic (subsonic) filter?
Again this is up for debate, here are some starting points
for the less experienced.
Speaker
Size
Sealed or
4
th
order
bandpass
with
12dB/oct
filter
Sealed or
4
th
order
bandpass
with
24dB/oct
filter
Ported or
6
th
order
bandpass
with
12dB/oct
filter
Ported or
6
th
order
bandpass
with
24dB/oct
filter
8
35Hz
30Hz
Just
below
tuning
frequency
of port
½ octave
below
tuning
frequency
of port
10
30Hz
25Hz
12
25Hz
20Hz
15,18
Not
needed
Not
needed