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Have a ported box for four 12’s was built under spec subs need 1.75 min and what I have is 1.48 after displacement. Would polyfil help? Plug the ports and just run sealed or just run 3 subs ? I was leaning on just running 3 as each set of two is on an amp at 2ohm for 1000 Watts I can have the single sub still at equal power as the others and gain airspace idk. Any suggestions would help Obviously a new box is got to happen when I can make that happen will take time.

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What subs are they?   How much port area?

Polyfil won't help you, in ported boxes it only reduces output.

Assuming everything else is fine, there isn't going to be a huge difference in output between 1.48 cu ft net and 1.75 cu ft net.  

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