I plan on running 450-600 watts to 2 4-ohm SVC subs wired for 2 ohm. My question is: how do I figure RMS to each sub? I want to buy subs that can handle the load but don't know if I should be shopping for ones that handle 300 watts max or 600 watts max. FWIW, I'm leaning toward the Lambda LE12. Thanks.