i have a alpine pdx 1000.1 and its rated at 2 ohms and 4 ohms at 1000 watts continuos. and my rockford t2d2 sub is a 15 inch dual 2. since i only can wire it to 4 ohms and 1 and my amp not stable at 1 ohms should i get a t2d4 so i can wire it to 2 ohms. what should i do? or whats equivalent to the rockford t2's. like 15 l7 or orion hcca or fi or btl or re. i wanna kno whats equivalent. im thinking bout trading my sub for another equivalent one.