first sunny is right
(Y) second go on any electronic shop where they my UPs's and stab-line makers ask them u want to use your car amp with your computer they'll provide the supply becoz same way i have done one
:d added 2400 Watts Amp and two woofers 15inches of Kickers along with kickers speaker last time when am in England.
here still using with 1200 watts amp 12 inch woofer of kenwood plus 4 speaker remember dont push all of bass from amp and computer becoz it shakes the hole house
its freaking awesome if u use Kickers Jackhammer Woofer using this woofer in home nearly break all ht glass of your street my cousin have a Acura integra in USA he tired in his garage and broken down of atleat 10 houses glass