6.5s

ok we have a 36 volt ez go golf cart. its 2 seater with the 2 seats u can put on the back. I was thinking one or 2 8" subs built under seat where batteries are then 2 6.5s up front. and 2 more 6.5s under seat as well. for this im thinking a 5 channel amp will be best. but my only issue is...