suggestions on this setup?

I really don't like the definition of SPL...SPL=sound pressure level, which is the measure of sound..It is measured in units of bells...so in lamens terms SPL is how "loud" it gets..but is not just "loud" sound...every sub has spl.

As for the Brahma..It works well in both sealed and ported enclosures...if you're looking for strict SPl or even SQL...id go ported. Id only go sealed if you were going for strict sq and nothing else. Ported's the way to go IMO..but whatever floats your boat.

could someone plz explain this for me???

Here goes:

The part about the ported box generally having a lower cut off frequency than a sealed box basically means that the ported box will be able to play lower frequencies without distorting, up to a point. Once below that point, the cut off frequency, the sub becomes unloaded. This basically means that the suspension system of the speaker is unable to control the amount of excursion and you will get a great deal of distortion. I can't say for sure that all of that is right but it is pretty close. Basically what you need to know is that a bandpass box works great within its given range. This range is specified by the size of the box and the port. Depending on your box the sub may work great from 30Hz to 75Hz but anything outside of that range will not work well. I would not recommend buying a bandpass box that is not specifically made for your sub because you don't know how it will perform. Someone should be able to build you one easily if you can't do it yourself.