BA SPG555 Enclosure Size?

[Murphy_Smith 10+ year member]

I picked up an SPG555 from a forum member today and want to put this in a sealed enclosre in my boat. I am going to fire it into the side of the hull.

BA recommends a 1ft cubed box. Does anyone have any thoughts otherwise.

Pushing amp with Arc Audio KS 1000.1

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[mcsoul 10+ year member]

2.5-3 cubes tuned to 28-30hz or 1-1.25 cubes sealed.