Let the elaboration begin!
Anything that has at the minimum of 2 voice coils can typically handle lower bass and produce it cleaner. If you could get a 2 1/2 voice coils you would have more potential. the voice coils are what produce the sound, a positive current forces the coil to move away from the over sized magnet and produces a frequency the faster the speaker's ability to move the quicker the response to changes in tone. If the speaker cannot produce the frequency fast enough the next note will be distorted.
Also a big part in producing audible frequencies is the box the subs are in!
Ported boxes- Are exactly what it states, it has ports built in to the box to allow the change in air pressure easier. this can be a good thing but keep in mind you can over extend the subs easier as well.
The depth of the port has more to do with how wide and deep the sound will be. < no joking fellas I know you can't resist>
To be noted this takes less power to produce sound since there isn't any resistance to the speaker in the way of physical movement
Sealed boxes- Also as it states the air is sealed inside the box to allow for the subs to compress the air, thus making it easier to rebound back and be ready for the next note since it is not as free floating.
this creates a more crisp and accurate frequencies. Keep in mind that it will need more power to run the speaker but a better end result depending on the application. This box needs to be within the specifications of the sub's air space recommendations in order to receive the maximum potential from the speaker.
Band Pass boxes- This is a more complicated box, it has a sealed side and a ported side. This is like having the best of both worlds, you have the air compression that helps the speakers from over extending and the ported side to help the frequencies travel easier. There are drawbacks as well since you have both options you have an overall larger box.
The key here is once again the size of the sealed side and the depth and width of the ports. I do not suggest the Dual Audio's band pass box, the Plexiglas is purely for show it is less than an 1/16th inch thick. 1/8th inch- 3/16ths inch should be plenty. I will also suggest that you use coarse thread screws to hold the Plexiglas in place.
For a grand prix I would suggest a sealed or band pass box measured for the speakers you want to use. if you go with ported any ways you should find a way to run ports on the rear deck to help the sound travel to the cabin area and do not over power the speakers in the trunk.
ported boxes are better for SUV's, Hatchbacks and Wagons because they share the air space.
band pass boxes also work very well in these vehicles but also in sealed trunk spaces as well.
Sealed boxes are best for... you guessed it Sealed cargo areas
