Sundown sd-2 12" sealed vs ported ?

[L7solo]

As of right now I have a pretty small system, 2 10" infinity subs rated at 250 watts rms. I'm thinking about purchasing a sd-12" I'm wondering if it would be much louder than the infinities and would I be better off having a sealed or ported encloser. The problem is I don't have much room I'm working with a f-150 truck and want to put the sub under the back seat Any suggestions ?

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[Jeffdachef 5,000+ posts]

should build a ported downfiring enclosure for those infinitys first before moving on to other subs.