shotokan_teen

I am pretty serious about doing a blowthrough to my F-150 in the next few months. I am pretty settled on 2 18"s on 4000 watts (will be more with upgrades in the future.) I was thinking of a 4th order bandpass box for them but I want to be loud on low hertz (like around 30-35). How can I accomplish this? Also, what would be better: 2 18" or 4 15" all on 4000 watts? Like I said, I want to be loud but hit low.

If I wall it off in my truck, the subs will go right into my seats. Will they still sound loud this way or does all the sound go into my seats?

I am looking at doing a blowthrough in my truck (yeah I know...its going to be expensive and a lot of work.) I'm not sure on the subs I want to run yet though. I'm looking at either 2 BTL's or 2 RD audio Alpha V.2. The sizes I'm looking at are either 18s or 15s. I want it to be loud at low hertz but I also want it to HIT hard and not just be loud with no punch to the bass. I have 4 Crossfire VR-1000D amps (putting out probably right at 4000 watts but will be more with the Big 3 and more batterys). which would fit what i'm looking for better?

anyone?