Aftermarket subwoofer
 

Hi guys,
I could use some advice, I want to install an aftermarket subwoofer and amp (Treo 15" and 1350 W pheonix gold amp) in my 2017 Civic Si but I am concerned about the electrical capability of the car. The voltage of the car at rest is 14.4, but averages around 12.8v while driving normally, and dips all the way down to 12.4 when accelerating. If I turn the AC on, it maintains 14.3 or so. I think there is some kind of limiter on the battery and I don't think 12.8 volts is enough to support a 1300 watt power draw. Any suggestions would be greatly appreciated.