the enclosed box where the speakers are inside the box i heard is the best like where they have the plexi glass cover to it... any suggestions/experiences are welcome

 

The type of subs make all the difference on which enclosure will sound the best, as well as what kind of bass you would like to hear from your subs.

The box you are speaking of is most likely a first order bandpass box. It may net the most dB for a common enclosure but its design limits the frequency range and response of the sub. Having a bandpass box means having a sealed box and a ported box in one, and usually means a large box. The main effect of the bandpass box is to crossover the subwoofer using the pressure levels in the sealed chamber along with the harmonic waves produced at the port. This allows for the most efficient usage of the speaker in a range based on the design of the box which can extend into very low frequencies.

A tuned-ported box will allow a good range of bass and response with a very high dB level but tapers off outside its range and without a subsonic filter could damage your equipment.

A sealed box will produce the tightest bass, have the quickest responce and will enable you to run the most power to your speakers of the two, but it has a flatter response curve and will not produce as many dB as a ported box. It is also the smallest and lightest box design in most circumstances.

I personally like quick bass which fits my music better so i would go with a sealed box as my first choice, but its all up to what kind of subs you have(though usually subs work in all types very well), what kind of bass you want, and how much room you want left in your car.