I'm trying to make a list of things I need to get and/or do. I'm going to do the big 3, upgrade my battery,and already got a HU. Okay I have a 15" fi BL, if anyone could point me to some spec of a box with good SPL that would be very helpful. I've aslo got a RF 1500-1bd so would I need 1 or 2 batteries for it all.Could I use one battery to run my car and the system with no dimming of my lights? My alternator is stock, but I don't know much about them so how many amps would be good? I'm putting it all in a 99' Jeep Grand Cherokee. Thanks in advance.