What size subs to get?

[Teezy 10+ year member]

I was going to try to build my first ever box have no idea how to just seen a few video's seem's fairly freaking easy but anyway My box is going into a small trunk and is going to be L/40.5 x H/16 x W/ 23.5

tuned to 30hz i wanted to know what size Obsidians to go width and how many?

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[quackhead 10+ year member]

I'd look at a couple of 12's in a custom ported box

 

[Teezy 10+ year member]

I was thinking bout that just needed another opinion thank you.