building a 12" sub box

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thanks for replying so soon.

yeah,i have to get it done with in 2 weeks.i dont know much else.its running off a 1200w amp that is also driving mids,tweeters and 6-9s.how much does a port help.i need in to be the correct size for a volkswagen polo hatch back.😀
 
A port helps to get more low bass, but you don't have any information about the subwoofer so you can't do a ported box.

That's why you should go sealed, and build the biggest sealed box the car can handle and the owner can tolerate.
 
so if i take up half the trunk with a sealed box it will give me more bottom end and a few more dB's.i have a 1200w to run the cars ssytem.how should i run it.must i bridge the 6~9s and have more power driving the sub.
 
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