What load will you be driving with that amp and what will you have it fused at? 340 amps seems excessive for your alternator. Even if you run a 1 ohm load, you should probably only be fusing it at around 150 amps. As for a capacitor, might not be a bad idea, but won't solve low voltage issues, it'll just hide them.
Water
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its a mono amp 2000 watts rms underated could hit anywere from 2200-2400 like I said 275 fits im not doing this its too much power for me to even attempt I still have my 85 by 4 watt eclipse amp for highs
my thing is will 275 amps be enough and wich cap should i get an how many farads i saw a jl and rockford cap does it mater who cap you get?
I'm not that familiar with rockford amps, but you seem a little optimistic in thinking that rockford amps are 10-20% underrated. Anyway, that 2000 watts RMS is at 1 ohm, will you be using the amp to drive a 1 ohm load? 275 amps will honestly be enough. Even if you're right about the amp being able to produce 2400 watts RMS, if you divide that by 14.4 volts, your still only using 167 amps, leaving 108 left for your car. Your car's electrical system and lights won't need more than 1500 watts. As for your capacitor, as long as you buy a decent brand, (not a walmart capacitor) you should be fine. Find the manual for that amp and see what the recommend for a fuse size.
You won't have 2000w flowing continuously, only on the deepest and most powerful hits. The average drain will probably be about 80-120, depending on how you listen to your music.
Also take into account that amplifiers are not 100% efficent.
yea, 1500 watts is a lot considering that its far more than the your entire car would use before you put the system in. Your car doesn't have an unlimited power supply, just an alternator, and it has only has a few amps to spare. Get around a 200 amp High Output alternator.