Good displacement and tuning for 2 xfl 12"s?

[Audio freak]

I've got 2 american bass xfl 12"s in a box from mobile sound works. The box is tuned to 32hz (I measured the port and it is 32hz) it is 4 cubic feet or displacement 3" L port. This box is very well built. Solid and tuned like a custom made box with double layer baffle and very nice construction. Now mobile sound works makes a 2 12" subwoofer enclosure dims are 5-6" L port tuned to 34hz and is 5 cubic feet of displacement and also has double layer baffle. Is seems very well built and has great reviews. What is suggested for 2 12" xfls? I'm gonna be running them on around 750- 1000watts rms per subwoofer. Is the bigger displacement and port a better option? The box I currently have sounds amazing. Extremely loud and clean it just doesn't seem to be a big enough port for lows.

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