yea,im setting up a lil system inmy trunk there 2 10 inch 800 watt Pioneer TS-W255C sub woofers with a 1200 watt power acoustic amp.im haveing a lil problem i have my stock radio in right now till i get my new one in a few weeks and the stock radio dosent have the rca inputs in the back,my firned told i can bridge the rac cables so i only have to put 2 in the amp,but i need to know how can i bridge it?