help and ?'s with a bandpass box

[tigerh4rf 10+ year member]

guys i have 4 rf p3 10's i want to put them in a bandpass box tuned at 68 hz.I used bassbox pro and i gave me an enclosure with one chamber at 16 cubic ft and the other at 5.85 cubic ft. with a port measuring 11"x11" with length of 2 inches. Guys does this sound like it will work? does this measurements sound accurate to you guys and help will be appreciated.

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[blackbonnie 5,000+ posts]

why tune so high?