I have a Old School PPI Are Series A1200 PPI rated them at 300x2 @4ohms stereo or 600x2 @2ohms. Mono output in a 4 ohm load is rated at 1200 watts. Keep in mind they use a regulated power supply so output should be constant down to 11.5 volts. My question is, i want to get a JL 13.5 W7 and i...