Looking at the specs, the JL 500/1 puts out the same power for 1.5 - 4 ohms. The only difference is the damping factor is twice as good at 4 ohms compared to 2 ohms (>500@4ohms vs. >250@2ohms). With that said, would it be better to use a dual 2ohm voicecoil in series (4ohms total)...