Update: I am buying a Behringer EP4000, along with a minidsp and a behringer ecm8000 mic for tuning to my room. I still need to decide on box size, box type, and drivers. Forsure only one box, 1 or 2 drivers in the box. Approximately 400 dollar budget on drivers.
I am probably going to buy a 1300W RMS amp, the Behringer EP2000. I need a sub for home theatre that will go with this. I want strong low frequencies for nice rumble for explosions etc. I am thinking a 15". What do you guys suggest? Also if there is a better amp for the money let me know
Also one other thing, I can just use the pre-out on my avr and use a RCA to XLR converter for the input into the EP2000 correct? I read a couple people had problems with their impedance on their output from their avr's because the voltage was too low or something and it was too quiet?
Also, any advice on what type of box and box design? I guess this will depend on what driver I pick. The size of the box im thinking of is at max 20" deep doesnt matter how high or wide.
I am probably going to buy a 1300W RMS amp, the Behringer EP2000. I need a sub for home theatre that will go with this. I want strong low frequencies for nice rumble for explosions etc. I am thinking a 15". What do you guys suggest? Also if there is a better amp for the money let me know

Also, any advice on what type of box and box design? I guess this will depend on what driver I pick. The size of the box im thinking of is at max 20" deep doesnt matter how high or wide.