Transfer function of achieved filter response looked relatively good
in acoustical power.
No large peaks at cutoff, which is often seen in designs.
looking at impedance curve.
first peak was around 50 Hz which seemed impressive.
second peak from port was 10 Hz
So seemed lots of potential for good bass.
Curious I checked driver Fs and is impressive 22 Hz
So first impedance peak at 50 Hz seemed good.
But curious why so high with 22 Hz Fs
The driver has lots of seemingly good bass potential.
Then seeing impedance peak at 10 Hz seemed very good.
But curious how so low with 50 Hz peak.
I think because mechanically with such low Qts
It is simple to make box small and still get good bass output.
So should be fun challenge to find balance for good volume.
Qts is very low, so can trick you into making box too small.
Because mechanically is friendly to small box.
Of course normal reflex is easy to determine box volume.
In transmission line " offset" is what creates the volume.
So often offset is not ideal for driver stiffness.
Maybe play around with driver offset, and try to get 50 Hz impedance peak down.
Essentially quasi relation to normal reflex volume.
Then of course second peak at 10 Hz will rise.
So line length would need to be adjusted to get desired bass output.
Should be fun driver to play with.
Because high Qts will play tricks on you.
Otherwise seems very nice and should sound good.
If using TL line then obviously crossover it suited below ripple.
Is why i dont transmission line, because its relation to Reflex is same.
Just quasi relation to reflex takes time to find. With right offset to
be friendly to driver suspension/ Qts. Then additional time to make
tuning with port to long and too big.
I would just determine volume needed for .5 to .7 Q in sealed enclosure.
Whatever that volume is. Is relative hint to what driver offset in line needs to be.
To essentially create a ideal volume for driver suspension.
First impedance peak frequency will tell you if close to making suspension happy.
after that line length and size is however large or small you want it to be
to achieve same tuning as reflex. Whatever extra ripple barf that comes out is fixed
with taper or absorption.