I am purchasing a kicker solo x 12inch and installing it into a crown vic. can i hook it up like a regular sub power from batt to cap and amp or do i need to have an extra power source like another battery in the trunk? solo x is in a large box (1.5m x 0.5m x 0.5m) aprox. amp is 2000 watt rms. let me know what i need to install audio system properly. 0 guage wiring etc. thanks for your time.,\\ john

4Ga wire should be plenty for your application.
If you're concerned - run (2) lengths of 4Ga - its cheaper than 0.
A battery only extends the playing time of your system with the vehicle off.
Your car runs off alternator power - and it is recommended you upgrade the alternator to a High capacity one to properly supply voltage to your amplifier.
A capacitor is a cheap bandaid that will prolong the life of your stock alternator - but eventually - the alternator will die from the lage demands placed on it.
Put the battery and cap money toward a High Output alternator.

Thanks for using FixYa - a 4 THUMBS rating is appreciated for answering your FREE question.