Umm...1 mag is either 1 or 4 ohms. Even if you could wire it to .5 why would you? Its efficent enough that 600rms is plenty and capable of 900-1200 daily. Sooo...why? Do you think you really need 3kw for your sub stage daily? Do you enjoy your hearing?
Last, Have you ever even owned either of the above mentioned subs?