amperage

I want to run 2 resilient sounds platinum series 15s, but I have all stock electrical right now. I was looking at Js alternators but I don't know what amperage I would need and battery's too.

okay so my 2014 Nissan Sentra it comes stock with a 110 amp alternator. i want to put a high output alternator into it in place of the stock alternator, i have done the big 3 and i have 1/0 wire running to the back of my car in the trunk with a 2 farad cap. the problem i am running into now is...