Yes, if you want a tuned sub and the port needs to exceed about 22" you need to think about an ABR instead of a port.
Your problem port problem is not the most serious.
Your problem is that the suspension of that driver is not designed for anything other than a sealed box.
Take a look at the file below.
First you can not get rid of the bass peak. That is the maximum I can minimize it.
Now look at maximum acoustic power. You can not get to 105 db until 70 Hz because of lack of restoring force in a vented cabinet.
Now look at the maximum electrical input power. Note because this driver has a very powerful motor system and not much restoring force in the suspension it takes only a puny amount of power where you want it in a vented cabinet. If you use more you will damage the driver and may be you have already by using it improperly in the wrong application.
Now look at the impedance graph. That absolutely tells you, you can not tune that driver in a vented box. It does NOT actually tune. There is no dual saddle hump curve.
Those are the reasons why there are no vented alignments out there for that driver. There are just absolute contraindications to a tuned enclosure. This is truly a sealed only driver.
I just don't know why you persist with this.
You have a driver that used correctly as the designers intended can make for a really good sub.
Those characteristics are a powerful motor system and very large excursion. When you make that choice the driver is not going to work in a tuned box. Those are the facts.
If you want a vented sub, then you have to sell that driver and get something else suited to that application.
That is why I at first did not publish a vented design in case someone actually tried to build it putting at risk an expensive driver.
Hopefully I have given enough graphic warning here not to try and tune this driver, but put it in a sealed box with Eq. With mini DSP and such this is not difficult.
