Hello all- I am currently running a JL 12W3 2-0hm sub off a new Alpine PDX 1.600. The sub s rated at 500 rms, and although the amp is rated at 600 rms @ 2 ohms, the birthsheet shows it tested out a almost 700 rms. It is so much power for my little Mazda 3 hatchback. I have the gain on the amp...