Either one. It looks like you have a port there. If you port the box, you have to subtract the volume of air the port takes up. Then the volume of air the speakers occupy sitting inside of the box. That means the 15's would only be betting around 2cu ft. And did you calculate the volume of the box by measuring the inside or the outside? If the outside, take off another half cu ft or, better, remeasure it. If you only have 10 cubes, I'd go sealed and try to invert the subs to gain as much room as I could. ... or just 4 12's ported. I think you're frequency response is going to be really screwed up in a box that small, otherwise. If you use WinISD and purposely tune it to be f'd up at a certain frequency, that might be ok, but if you're building a daily driver it's probably going to sound like crap to anyone that really knows much about audio. Get a few other opinions though, I've never built a box that small.
Sometimes, when I'm really nervous, I stick my hands in my armpits, and I smell them. *SSSSNNNNNNNNNHHHHHHHHHHHH*. SupahStahh!
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