I am thinking of purchasing a Power Acoustik LT1920/2. It runs 370 watts @ 4 ohms, I think 420 watts @ 2 ohms, and 840 watts bridged. I need to know what I am going to need to power this monster in my 89 Sentra. Would I need a cap, beefed up alt, or deep cycle battery? A friend has told me that you will have to have your alt put out 100 amps per 1 thousand watts. How many amps does my alt run. I just bought it a year ago and I dont know how many amps it puts out.