Does having dual coils make a difference?? Is it better to have dual or single. I'm thinking about buying the 10k, I have a JBL 600.1, the rms for the 10k is about 325rms, if I am not mistaken. Should I buy the single coil 4 ohm and give the sub 300 watts or should I buy the dual 4 ohm and run it in paralell? Would 600 watts be too much?