I was reading some other posts. Someone mentioned that getting a dvc sub wont improve spl. I thought that is i had a svc sub my amp would push 4 ohms into it say about 300 watts. But if i get a dvc sub the amp would push 400 watts rms into it. Wouldnt the 400 watts on the dvc sub be louder then the svc sub? Im confused once again. The life of a newb.