This is an experimental design. Nothing in this box is random. I'm not exactly sure if it's going to act like a horn or act like a ported box, but this enclosure is designed based off 2 sound theories and raw sound math, so it's a free design for someone who couldn't or didn't want to pay for one at this time. So, if you maybe want a free design with the correct conditions to get one, let me know. I'll do some hybrid designs that I've been working on and trying to figure out the best way for them to work.
This box is for 2 Skar SVR 12's. I would either call this a tapped and folded rear-loaded horn or a series ported-transmission line. I didn't use any horn modeling to do this; it's all based on raw sound math, 1/4 wave math. The way rear loaded boxes work vs a t-line is based on different types of 1/4 wave calculations, but that's a lot to explain. Anyways, here's the box:
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