Thanks Drew and John. I am going to have a sub box custom built to the exact manufacturer specs that is called for by the sub I choose.
I am really liking the DC XL and Fi BTL N2 right now. Though I am leaning towards the DC because I keep reading they have better SQ than the Fi that is meant for more SPL than SQ.
Now that it was mentioned, I was also thinking of whether I want a 15 or 18.
Also trying to figure out the sealed vs. ported dilemma too. I do want the sub to be loud to the point people want to know what it is, so I'm guessing I want SQL a bit too. That is why I am leaning towards ported.
The last question I have is whether there is a reason people run these type of subs up-firing? I would prefer mine rear-firing like a normal sub. I was thinking maybe it is a space thing?
Also, do these subs last? I read they don't and often need reconing. I do not want to have to recone these because I will only have them for 2 years at the most and won't push them too hard.