Gotcha. As far as improvements, i would say you need a slightly bigger box. I think the minimum for a ported box with 2 12"R's was 2.8 cu.ft. Those were the specs the sound guys that built my box gave me. They said the perfect size for my car/setup was 3.0 cu.ft. But the least should be 2.8cu.ft. That should let you hit the lows alot better, and get that bass that makes your nose tickle. I had a 2 cu.ft box when i started out and it was loud, but i could never really hit the lows hard or feel the bass. The 3.0 box made a world of difference, now it about makes me sick with all the bass. Alot of it will have to do with how your crossovers, low pass filter, subsonic filter etc.. all of that are set. It took me forever to tune mine in. I bought my system almost a year ago, and im just now getting it right. But when you get it right, it will be worth it. Keep trying different setups until its right, dont settle for "ok" sound and dont give up. Hope that helps.