If an amp is 800 Watts and 2 Ohm, it should be matched to a 400 Watts DVC 4 Ohm sub, right? Why am I asking this? I'm going to add some bass to my beater with a hand-me-down amp. I just need a little direction on what sub to buy. Also, I only have room for one sub. If it matters, the amp I will be using is a MTX Thunder 801D. thanks in advance.