I have a Rockford Fosgate Punch P500.2 amp that puts out 500 watts RMS. I have connected and bridged a Rockford Fosgate Punch P212 that is rated at 400 watts RMS. If i have the amp at half gain is this too much power for the sub to handle? Can I turn the gain up more, is it good where it is at or should I lower it. I do not want to blow this sub.