Alright I have two 15" 1000w subs for the trunk of my celica. Two 400w 8" legacy speakers for the doors, and im plannin on speakers for the back prolly 400w. What kinda amp should I get? I'm kinda new to car audio, is there a certain number of channels I should have on it? A certain wattage that might sound best. Also I know I need to get tweeters for the front speakers. Do I need them for the back? I know it's a dumb question but I'm just double checking. Thanks for your help

do you plan on having an amp for the front four and possibly six speakers? if you plan on just runnig your 2 subs of an amp i would sugest maybe 2 JL audio 500/1's or maybe just the 1000/1, but thas kinda expensive. need more details how you want to set it up