i have 5" speakers in the doors, 6x9 mounted in the factory location behind the seats... had to open up the holes to make em fit these are run off my deck... then i have a 10" sub in a box (box bought from walmart fit perfectly behind the seat) powered by a 400 watt amp... the system sounds good and has enough base to make everyone look from blocks away... Iv done enough systems to know that you don't need big to get good sound... oh and im 6, 2 so my seat is all the way back