An car subwoofer is designed to play bass, hence why it has such an large surface area compared to other smaller speakers, such as a mid range driver and tweeter. What type of bass your car subwoofer plays can make an big difference on your overall feel of your car audio system. There are two types of bass, the boomy bass and the deep earth shaking bass that you can feel before you hear. What type of bass you gain from your car subwoofer depends on the enclosure itself and how big your subwoofer is. 15 inch subwoofer has more cone area compared to an 10 or 12, so technically it has more potential to hit harder and deeper. An sealed box is air tight, there is no port that allows air to escape out of the box. This provides an punchy sort of sound and provides an flat frequency response. Sealed boxes tend to respond better to parametric equalisers because they can play from 80 HZ all the way down to 20 HZ. However, the trade of is the bass is even throughout the frequency range because of this reason sealed boxes are known to don't be used in bass competitions. Sealed boxes are small and easy to construct, all you are doing is building an square.
Ported or vented subwoofer enclosures provide loud and deep bass, with some trade of in punchyness and sound quality. The idea of an ported box is to make as much noise as possible out of the speaker. Ported vented style boxes are usually louder by 3DB compared to sealed. Ported boxes are bigger in size and also have to be designed correctly for the subwoofer and your music tastes. You can tune how you want your bass to sound with an vented box. You can tune the port to any frequency you are targeting, for example if you want deep lows, then 30 HZ will allow your speaker to play that type of sound. If you want louder boomier bass, then you can tune higher to 38 HZ. Any music that has bass content around the tuning frequency of the subwoofer enclosure will sound its best. The old trade off with an ported subwoofer enclosure is it will only sound good on certain tracks, not every song will sound good.
If you want deep low bass, get an custom subwoofer enclosure made that has an low port tuning, 30 HZ is my recommendation, along with the current internal cubic feet volume your subwoofer requires. You can find this information in the user handbook. Furthermore, the tuning frequency is based on your listening tastes there is no perfect number. You can also consider interchangeable ports to increase or decrease box tuning to experiment with your sweet spot. Go to an proper box builder in your local area, don't go to no cowboy, car audio shops are expensive but they are knowledgeable and can get you the best sound.
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