Nice Idea....and might i add a few points. You will need a High Pass as DH mentioned, and the EP2500 may need level matching to the AVR, so the Behringer MIc2200 is a viable and affordable option that does both and adds a single band of adjustable PeQ as well.
Why not lower the tune to 16-17hz and get the most extension possible. Since it's inside the bar, you're not fixed to port lengths since you can run them externally from the box but inside the bar! You won't loose net box volume due to port displacement either. Two 4" ports at 38" each will get to 16hz without port compression or chuffing. Use the PE precision ports and add 4" pvc pipe to extend the length as desired. Truthfully i'd rather see you do sealed than tune a Shiva to 22hz. All the good stuff rolls off after 22hz at a pretty steep rate unlike the sealed which will still give you extension into the teens and won't sound bloated with room gain. The 16hz option acts like an LLT and has a slight rolloff before tune allowing rum gain to do it's thing in proportion to the rest of the spectrum instead of an exaggerated hump from 25hz on down.
[quote=mobeious;16567707]i just did that cause u said u would rather see me go sealed but here is 16 vs 22 vs sealed
Don't forget the room gain... expect 6-12db of that from 25hz on down. It'll fill the gap in the Anechoic respose graphs right quickly. Your Sim doesn't show the hump at 23hz either for the 22hz tuned Shiva. Add the room gain to that and you've got a real mess on your hands.