What this guy said. Now I know dakota's a re a pain to get loud. I wounder the same about Ram's. What you are going to need to do is play around with boxes. Build many of them. Try this way and that way till you get what number you are looking for. Also that port area will need to increase. And well more power as well. I dought that amp is really giving all the subs that much juice. Not knocking the amp. And got to ask is this setup all out spl or daily as well.not enough power as u have imp rise prob going near 3ohms or higher and ur prob not even giving each 500 rms, when u have one u have more power concentrated on one sub. more power????