All depends on what kind of music you listen to. Bandpass gives you sort of a "loose" sound utilizing not alot of power....good for rap. A sealed box gives you tighter and more accurate bass, takes a bit more power.....good for rock music. I used a dual-sealed box in my bull and it slammed. I listen to everything, metal, techno, some rap...all sounded great. Are you using this in your wagon or the sedan?
I don't know what model speakers you have, but speaking from popular experience, Fosgates are better than Jensens, HOWEVER, I used to have a Jensen 12" DVC sub in a sealed enclosure in my car, and it was great. I liked it much better than my friend's fosgate 12" in a bandpass box.
I personally don't like bandpass boxes, as I think they tend to sound really sloppy and don't hit very well. As was said, for loose bass, they are good, but if you like rock, you want tight bass, and you can't beat a properly tuned ported box. The ported box allows for the same sound levels as a sealed box at lower power levels, thereby decreasing the amount of work the sub needs to do and decreasing the chance of damage to the sub or the amp.
If I were you, I would plug both into an amp and listen to the quality. See which one you like better. Also, what kind of box are the fosgates in? Sealed? Ported? Bandpass? If the fosgates are in a sealed or ported box, I would personally go with them, but if they are in a bandpass box, I would say to hell with the whole system and custom build a sealed or ported box.
The RF's are in a Rockford Fosgate ported box. I bought it assembled and assume the box was designed for the speakers. That's a good idea to hook them both up and listen. Why didn't I think of that? :homer:
just use the fosgates. if they came from fosgate in those boxes, then i am sure they are deigned for them. different speakers perform better or worse in different enclosures. look at the JL-W7. It sounds much better in a ported box than a sealed box, because it was designed for ported. i STILL need to get my system set up, damn i am lazy.
lol JL w7 ya if u have over a grand to drop for 2 subs w/o an amp. W7's actually sound badass sealed too. i got my fosgate in a ported and its loud but not very accurate, bass is not ass tight as in my sealed box