Proly gonna sell my 2 SA 12's and go for 1 Zv.3 18". the SAZ-1500D is my current amp so if I don't need to upgrade that to its a huge bonus. What do you think?? Enough to get that 18" moving @ 1ohm? They are "rated" for 1500RMS and the 1500D puts out about 1800 with good electrical so it should be okay with how underrated sundown subs are. The last question I have is will I be louder? Any thoughts?? Thanks!