Hello, I just purchased a JBL CS200.1 amp to power an Infinity Kappa Perfect 12.1 sub. The specs are telling me it will do 338 Watts X 1 at 2 Ohms and 230 Watts X 1 at 4 Ohms. When it is hooked up to the sub, which amount of wattage will it be producing? And why is power at 2 Ohms always more? Thanks, I am VERY new at this stuff....