I'm having trouble selecting the best enclosure for my weapons to go in the trunk of a 2004 Honda Accord. I have a Polk SR12-Dual Voice Coil that I'll be using with a Kicker ZX750.1 amp. I've heard that if I'm looking for sound quality to go with a sealed box but if I want power and clean bass I should go with a ported enclosure. Please help... Any suggestions or comments would be appreciated. Thanks
Sealed gives better power handling (always) and can give better low-end extension (as in frequency response). Ported gives +3dB over sealed, and aside from it being noticeably louder it has a different sound to it. It's a little more boomy, but not as in peaky in the frequency response (depending on the sub). Sealed is usually a little crisper.
Ported & sealed being better than the other for SQ is a myth, it depends on everything else. You can't just put an SPL sub in a sealed box and have better SQ, and vice versa for an SQ sub.
You can model the frequency response if you have the QTS, FS, and VAS (in cubic feet):