If you want to still play music and demo a little bit with it but hit a pretty decent number, Go big. I'll give you a ballpark idea. I put my single hdc3 15 in a box that was 4.25 cubes net. Slot port with 110 sq, hit high 146's at the headrest @43 hz. Sub up, port back in a suv. Wired at 1 on a dd m3a. Try at least 8 cubes. 150 sq inches of port should do it.
I've tried boxes from 2.5 cubes to 4.25. Many sizes of ports. It did very well in a small box. Just peaked in the 50s and was not musical. I have owned every line except the lowest. I run a couple hdc3 12s for a daily driver. Another food for thought. Tested the new 12 vs the old. One with the spacer and one without. The old one was louder by .5. I'll post up results one of these days! Good luck
2001 2 Door Blazer -
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'11, '12, '13, '14 Meca Street 2 AL State Champ
AL Meca Street 2 Record Holder(151.6)
2012 Meca World Finals - Street 2 - 3rd Place(148.7)
2013 Meca World Finals - Street 2 - 2nd Place(151.1)
2014 Meca World Finals - Street 2 - 2nd Place(152.3)