engine noise on 6x9s

i have 2 infinty 6x9s that i jus installed in my car on a 4 ch. clarion i also have a 6x9 in a box in my rear seat hooked up to the clarion amp i also have 2 15 in. kickers hooked up to an mtx amp. i started getting engine noise when i put the infinity 6x9s in. can anybody give me any adive on how to get it to go away? thanks