4kw will take a new alt (200+ amps), 0 gauge throughout, and 2-3 strong Car audio batteries. A cap and 4 gauge will last you maybe an hour.well i have a 3 farad cap im guna throw in the subs are 2000 watts each, and i got 4 gauge runnin thru my car i was thinkin about putting 0 gauge in tho but im not complety sure well im thinking cuz the subs cost me about 1500 about 1000 for an amp, and a new battery is a must cuz mine is shit lol but i just want an amp that is decently cheap and will actually put out about 4000 watts, not just say it does on the box
