Has anybody recently changed the deck in their ride? I've got a 93 4Runer with a 7 speaker system. What I wanted to find out is if there is a seperate amp that's installed at the factory that power some of the speakers. If I replace the factory deck with an Alpine that powers 4 speakers for example, do I need another amp to power the remaining speakers or are they connected with parallel wires?

Any help would be greatly appreciated!