Well I have audiobahns but not those. I have the ALUM12x. Which is the one with the aluminum cover. They look sweet and sound even better. I have never had any expiernce with those subs but with my subs, man they sound great. Very accurate beat. I was told that my subs are "nasty." In a good way that is. Now as for the bandpass box, the bandpass box will make your bass louder but you will louse accuracy in the sound. But with rap and hip hop, I wouldnt worry to much about it. But for $250 you cant lose. As for an amp, I'm not sure. You can finish off your setup with a audiobahn amp but I was told they are not good. I'm still gonna get one to finish off my setup. Check
www.thezeb.com for amps. You can check out my subs too. They having a special on them for $130 each! Thats crazy cheap. Anyways man good luck!
Jason