I need some expert advice on this one. 4 6 ohm sub woofers? huh?

Ok so I have 4 JBL MK2 15" Subwoofers. I could wire them up to .75 ohms or 6 ohms. I the amp i have is good at one,2, and 4 ohms. I'm thinking that after the independence rise the .75 ohm will go up to one ohm and my amp should be fine. Anybody got anything to offer?