I did two sundown 10" Zv3's in our cruiser... with a wetsounds/arc 1000x1 @ 1ohm on each woofer in a ported 1 cf box each... it SLAMS. It hits harder than the two 12" XXX's in my nautique... but I think that is also box design and location. with only 1200wrms each, I would stick with the 10", but you could probably get away with two 12" Zv3's in 2cf boxes.