I have a Rockford T500-1db and a Rockford P3SD410 in a ported box .75cft. I am unsure of the sound, I would like it a little tighter and deeper! I had it built buy a great shop around here, but I am looking for more, I don't mind spending some more money to get the sound I want! Maybe I should look into other shallow subs? or do you think two of these 10's sealed would be better? I already have the new Rockford T21652 components front and rear powered buy a T600-4 and a Alpine INAW-900. Any advise would be greatly appreciated! I have read the internet to death trying to find a solution, in the space that I have,which is under the back seat! Thanks lots!