Sound system setup help

[Mr.Lahey]

I have no idea how to set up my system, well i do but im a bit worried about frying something, theres NO company that makes a HO alt for my car and the only 2 that can (Js alt, apex) has not connected me back for an invoice, its been a while...Can i add a second battery for my stock alternator? If so which is best recommended for my system? 

●The battery in my car atm is a "Duralast Platinum Battery H8-AGM Group Size 49 900 CCA" ,  

●Car: Bmw 328xi 2008 E92 Engine 3.0l 

●STOCK ALTERNATOR 180A 14V

●Amp skar rp4500.1d

●Subwoofer 2 sundown u12 (1500 watts rms each)

 

[TexasRam]

Just get one kinetik 3800 and wire it in parallel with existing batt, place it nearest the amp. No fuse needed between it and amp. Do a state of health test on your factory battery and alt. Best to replace your factory battery with a comparable kenetik as that wet lead acid starting battery will pull from the new kinetik at rest.

[Mr.Lahey]

I was planning in getting a Xs power or northstar, i heard better performance reviews,   but a second battery with a stock 180a alt is fine?

[Mike4068]

Northstar for the win. That alt should be able to handle 2 batteries. 

[Mr.Lahey]

3 hours ago, Mike4068 said:

Northstar for the win. That alt should be able to handle 2 batteries. 

What northstar battery do you reccomend? Keep, replace or add to the battery i have as of now?

[Mike4068]

Add a group 31 or smsagm220 to the rear. 

[TexasRam]

17 hours ago, Mr.Lahey said:

I was planning in getting a Xs power or northstar, i heard better performance reviews,   but a second battery with a stock 180a alt is fine?

ofcourse go northstar if you can shell out twice the price. but by doing the processes i stated, you'll have no problem with the kinetiks