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With the box being so shallow will that cause any problems?
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Nope.
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Thinking to tune it to 14 to 16 Hz have been modeling it at 15 Hz with each box 22.5 cubic feet a 8" port 21" long.
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You have enough volume so you can tune even lower, and I would. Maybe around 13Hz.
I'd go with the D2s because should you ever want to upgrade your amp setup, you could bridge an amp per driver @ 4ohms. And with the single EP2500, the D2s could be run series-seris for a 8ohm load, bridge the EP2500 and it would give you a solid 1300W RMS at 20Hz, under .02% THD. (well, thats best case scenario).