Infinity Kappa Perfect Sub Box Suggestions

[jazziman]

I have an Infinity kappa perfect 12.1D and it says the recomended sealed box volume is 1.0 cu. ft. The two boxes which I am interested in are both Q-logic, but one is 0.85 cu. ft and one is 1.25 cu. ft. I don't know whether to get the smaller one or the bigger one. Is there something I can add to make the bigger one smaller or the smaller one bigger (poly fill.. etc..)? I know I have other options available, but theses two boxes and right around the corner at my local best buy, so any advice about these two boxes will be helpful.

Thanks

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