I just found out the the 12w6 only comes in dual 4ohm configuration. I was really set on getting a dual 2ohm sub since I only want to run a single sub setup, ensuring that my choice on amps is not limited. I see plenty more amps that are rated to 4ohms mono than 2ohms mono. It's looking more and more like it's gonna be the IDQv2.2 sub that I'll be going with.