ok i've rethought my decision now, i'm just going to ask in my original topic instead of creating a whole new one. It's between 2 15" dc lvl 3s or 4 12" jbl power series. By adding two more twelves i'll have more cone area than the 2 15"s. Only thing that has me really wondering is that i'll be underpowering the jbls since if add 2 more twelves it'll be little less than 400 watts per sub. If i decide to go with the whole 4 12"s should i just go with a bigger box since they will be getting less power?