Port(s) placement for 4 15s, facing different directions

[maniackilla 10+ year member]

I'm not builing a 'wall' behind my seat, but I'm going to utilize it for 4 15s and ~13 cubes. Still gives me plenty of visibility and room underneath.

I will have 2 subs facing upward and 2 facing forward. I was thinking of a large port but I'll only have about 20" deep to go. I'd like it around 35hz minimium

Box is 50" wide, 22" tall, 22" deep.

It's going behind a 2001 grand prix 2 door's seats giving pretty comfy seat room. Ideas?

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