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Polyfill Yes or No if box is big ?

DIY Speakers and Subs - www.avsforum.com
Good evening Gents,

I recently acquired 2 HS24mkii subwoofers and overbuilt my sealed boxes. I honestly was aiming for about 10-12 cuft per but ended up I was way off with cutting and putting it together. (If my calculations are correct) I have with 14-15 cuft. I really messed up with the cut measurements and ended up with a bigger box. Thank God I have the space.

According to the Rule of thumb, I would need about 15 cuft of polyfill for each enclosure. As I don't have equipment to measure "Q" or something, I have no idea as to whether I need the polyfill or not. I already have it, but read conflicting information in a bunch of forums on whether I may need it.

One one hand I've read if the boxes are built to spec (which mine are not because the HS24MKII is specd for about a 10cuft box), I may have needed polyfill because the box would be smaller. I've built the box bigger and don't know if I need any. I've read that fill is used to "trick" the box into thinking it was in a bigger box. Do I still need it??

Since there's conflicting information and the box is built with MDF.. I cannot keep drilling and/or re-drilling the baffle as MDF isn't built for that. I cannot keep removing fill and adding fill etc. Also these things are HEAVY .

Please , Please let me know your opinions and wisdom and experiences.

Thanks in advance...


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