Actually, the pressure is equal to 1 18 sealed, because the ratio of subs to volume should ideally be the same. What actually comes into play is the structural integrity of the enclosure. Since the sides of the box are going to be much larger, and support more weight, reinforcements should be implemented accordingly.8 18's sealed??? that's a lot of pressure on the box...
most likely 2 hk4000sWhat power do you have to push them with? 8 18's will eat much more than 2 I would think.
BTW mj18's mainly cuz I think Kicker is overrated
The new ones can take at least 800-900, I've had mine on 800 for almost a month I think now and it doesn't get warm very easily, haven't had it smell or anythingThats an *** load of power. can the mj's handle 1kw each?