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I work as a car audio installer, and honestly the choice of using a sealed or ported box depends greatly on the sub that your going to use. I will say this never use a bandpass box, the response is poor and they are prone to damageing speakers.
Someone else was praising MB Quarts. MB Quart as a company has been sold. Most of their top engineers have left and now work with JL Audio developing their coaxials and components.
Do you have a price range that you would like to be in? Are you listening to strictly trance music? What kind of car is it in?
I myself have a kenwood kvt-911dvd which is a dvd player/screem, sirius satellite radio, and a 40gig hard drive. The music is sent from one of these to an alpine 13 band in dash eq with a parametric equalizer. The signal then goes to a soundstream picasso, and a soundstream 10.1, both class a amplifiers. The picasso powers JL Audio three way components, and the 10.1 powers a solobaric 12". For the electrical system I use an optima red top, and a 24v 1 farad capactitor. I also have quite a bit of dynamat in the car.
Now that I'm sure I bored you with this, if you have any questions about your own system, feel free to send me a PM, I'll do my best to help you.
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