Hi guys, I'm from Puerto Rico so my english is not that good, but I want to try to communicate with all of you. I know this questions is ask sooo many times. But I want to know your opinion on this. My car is a 1994 Corolla, the amp is a Soundtream Rubicon 400.1 mono, and the sub would be in a .75 birch ported box, about 2.89cuft including port area and tune to about 38hz and I listen to a lot of hip-hop, electronica, and rock(not at high volumes). The 15" subs I been looking are: Mmats P2.0, IA 187, Treo Tsx and Mtx TR75. All of them dvc 4ohms. I want the best ""SQL"" possible because I know that with just 400rms I'm not going to reach high SPL. I want decent sound, but as loud as possible. Thanks!