Need a sub for a box with 4.1 cubes

[ArrizX 10+ year member]

I picked up an Obcon dual ported box from a friend yesterday. Dropped my Type E in it for some fun and sounds great.

But I know it could sound better.

I need something that likes ported, and 4.1 cubes, and can be powered off a GTO301.1 II

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[mlstrass 5,000+ posts]

Tempest will work in 4 cubes. What is the box tuned to? Needs 300-500 to get loud and sound good.