This whole concept of max power is absurd. Someone will sell you an amp with a 15 amp fuse, so physically, max power is 15*12=180 watts. So if someone says "this system will do 250 watts" and they sell it with a 15 amp fuse, it means it probably runs at a max of 10 amps normally (or the fuse would blow the first time you played "hypnotize") so that means 150 watts max electrical power. Now if you find an amplifier that is 100% efficient, (ie, for 1 watt of electrical power you get 1 watt of output audio power) I will sell house car and family and buy stocks in that company because no amplifier is 100% efficient. So that means it's well under 150 watts of true power. So essentially, when someone says "250 watts", unless it says "RMS" in big letters, divide that 250 by two at least, so more like 125 watts.
Also, and what's with peeps putting huge capacitors in the car to "boost power" from the audio system? I've seen places sell capacitors with LED meters on them. That's like putting a 10" tip on your exhaust, it makes no difference! I mean, you can turn your car into one big capacitor on wheels, it will not change the power output of your system, nor will it reduce the average load on your alternator. It may prevent damage to fuses/alternators for short temporary spikes if you're lucky, but again, if you're in a CRX and feel you need to put a 1,000 watt RMS system and you want to play hypnotize, there's no capacitor big enough to save your alternator or battery, your alternator is gonna go bye bye no questions asked. If you really want to turn your car into a disco-mobile please just change the alternator and lose some HP or deal with the fact that a subcompact car cannot be turned into Twilo.
my 2 cents. cheers,