Not that it really matters now, but to throw my $.02 in, we were running (2) 18" x 2 per side of an IT8K for years with fantastic results. Last year we upgraded to the IT12KHD and have gotten even better results due the extra power. In fact we have always ran all of our racks at 2 Ohms and have always had terrific results! The key for us is wiring our subs for all 4 pins of the NL4, so each driver has it's own pair of leads. It basically doubles the amount of copper running from the amp to the sub. Works really well.