How to change ac(110) to dc at around 20 amps?

I'm setting up a car sub for my home theater connected to a car amp so i don't have to mess with the ohm conversion. From what i've seen it looks like i'll need about 20 amps. I've got an old pc power supply that puts out 14 amps but thats it. Any other ideas on how I could get 20 amps?How to change ac(110) to dc at around 20 amps?
You need a 12V, 20A DC power supply. Search these sites for that item:



http://www.digikey.com/

http://www.alliedelec.com/

http://www.newark.com/



Here is one i found http://search.digikey.com/scripts/DkSear



or look up an electronic supply store in the telephone book.How to change ac(110) to dc at around 20 amps?
You will probably need some sort of power storage device in the circuit because amplifiers often draw briefly draw large amounts of current, such as when it hits a loud low frequency bass note. I would recommend buying a 110 Volt sub amp because they can take advantage of a higher operating voltage and the setup will be much simpler. I included a link to an example.



http://cgi.ebay.com/M-K-MPS5160-SFBK-KX-