what do these people want to do? make it so you can hear the car coming from a mile away! i have NO idea why people would pay for someone to build a 20000 watt system. its quite simple, find the biggest amp, buy 10, find the loudest speakers, buy 60, hook them all up to an amp, and get a ton of batteries, and the best alternator you can find. thats how easy it is to build a really loud stereo.