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Message: <blockquote data-quote="HardofWhoring" data-source="post: 8832183" data-attributes="member: 674149">A few got it right.   I wouldn't bother with spending money on anything but a simple 1 ohm amp that can do 400 - personally you could higher than 700, but that's your call, and you might not want to for a few reasons.  It won't make much of a difference going beyond 400, but you definitely have the option to.  Just in case, you also need to know this, for every 100w your amp is: you divide by voltage, and then divide it by your amp's efficiency to get your draw.  100w / 14.4v = 6.95 amps.   Then  / .85 (average amp efficiency) = 8.16 amp draw you are adding to your electrical system for about every 100w your amp is.  32.6 amps for 400w amp65.2 amps for 800w draw.   You have room to add more than 400w of power, but it's a climbing slope of putting more power in, and getting less and less more out of it.  You're in that range you need to consider what alternator you have, and how much more of a draw do you want to put on your vehicle's electrical system.   32 extra amps, and you probably don't need to upgrade your alternator.   65 amps, and depending on what you listen to and for how long, and you might/probably do.</blockquote>