well...jus got my 2 jl 12w7s and im not sure wat amp to buy...i really would prefer getting it from jl...i did some research but im still confused...so the real question is should i get 2 1000/1 amps or jus 1 to power 2 12w7s?????
All energy for you audio system ultimately comes from the alternator. An extra battery only extends your reserve time and helps out when listening to the system with the engine off.
Ohm's Law can help us determine how much current we will need.
Current (Amps) = Power (Watts) / Voltage.
As a side note, if you plan to use Rockford amps, they use a 14.4V input rating (as do many manufacturers). To determine power at 12.5V (what car's electrical systems are), multiply the power by .75. (1000 Watts @ 14.4V = 750 Watts @ 12.5V).
Total up all the power and divide by 12.5. (750 Watts / 12.5V = 60 Amps).
It takes 40 - 60 amps to operate a vehicle so add this to the above number. In this case, for the amp to actually produce 750 Watts, our alternator will need to be in the 100 - 120 amp range.
Amplifiers cannot produce more average energy than the electrical system can produce.
The 1000/1 would do a fine job with two 12W7's if your charging system can handle the 80 amps of current required. The 500/1 is a very popular amplifier because most stock charging systems can produce the current needed.