No I'm not set on a 15, I was trying to design a box that could fit 2 12s and it is a tight squeeze. I just am worried my car won't be able to handle all the power is give it if I went with the sa12s. I'm not worried if I do the e series but I want the sa series. I really appreciate all the help from everyone! I am trying to learn about car audio. I thought I was making a good buy when I got the sound ordnance bp-80? At this point I think anything will be better than that.
One more question for you guys. If I build the box subs up port back is that going to be good. I read that to get the lower frequencies the subs should be mounted vertical.