need suggestions

[chicanito 10+ year member]

Im kind of confused on what exactly i need to do to my electrical to run a hiifonics xx colossus properly, everyone i ask has their owen opinion. I got an 07 avalanche, do i need to change the alternator? get a extra battery? etc. Can someone give me checklist of what i must do. thanks

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[audiolife 5,000+ posts]

bare minimum i would go is a 240 amp alt, big 3, and a group 31 sized battery in the back (kinetik 2400, deka, oddyssey)

better would be 300 amp alt and 2400 under the hood and 1 in back. would leave you a little bit over to do something with a mids/highs upgrade