Need Advice on New Car Sound System

[ChevyAllDay]

Hi all, I’ll get straight to it. I’m doing my research and putting together an ideal system for my car. I am looking for comments, opinions, and feedback on the set up, products I selected, ratings (ohms, RMS, peak power etc.), how it will affect my car’s electrical system, and anything else I might need to know. Thanks.

Car: 2007 Chevy Cobalt, 2.2Liter LT, 2 door

I already have Kenwood Excelon component speakers and a head unit.
Subs: 2 Alpine SWR-12D2
Amp: Hifonics Brutus BRZ 2100.1D (mainly because it’s really strong for a good price)
Capacitor: Fosgate RFC2D
Sound dampening material: NVX SDTK20

I was hoping someone could recommend a good ported enclosure? Also, if you think I'll need an extra battery or if the alternator won't be strong enough?

 

[emperorjj1]

i wouldnt really trust NVX sound dampening. and im assuming u plan on running it at 1ohm? if so ull need the D4 subs not the D2. lastly if you are running the amp at 1 ohm you will need an upgraded AGM battery at 2 ohms its a good idea but not as critical

 

[ChevyAllDay]

A few people have told me that I will need the D4 subs, so if I get two D4s and use the same amp, how much power would be sent to each? I know its a rookie question, but I'm still a rookie in this field. Also, what's your opinion on capacitors?

 

[emperorjj1]

RMS Power Rating (@ 14.4V):
4 ohms: 700 watts x 1 chan.
2 ohms: 1400 watts x 1 chan.
1 ohm: 2100 watts x 1 chan.

so if u run it at 1 ohm each sub will get 1050w. the subs are rated at 1000 apeice and u probably wont get the full 2100 from the amp anyway but on the off chance they really can handle the extra 50w. at 2 ohms ud be giving each sub 700w

 

[ChevyAllDay]

Ok thanks. In terms of the electrical system, I'm looking at getting a big 3 upgrade, a kinetic or optima battery, and a 5 farad cap. Do you think that would be sufficient?

 

[emperorjj1]

ya cap may or may not do anything sorta depends on the battery. Id look at spending more money on the batt if need bx vs getting a cheaper batt and cap. Sounds like u werent planning on doing that but just saying. Also the cobalt stock wiring is pretty nice. Big 3 will help but you want to add onto the stock wiring not replace it.