Don't put 6x9s in if your goin to put a sub in they will cancel each other out. To be honest i tend to keep it simple for the best quality my setup is alpine 12 type r sub ,6" pioneer 3ways in the front kick panels , Alpine v12 amp running the lot and an alpine head unit sound quality is spot on and if you want it lots of boom is possible. You could put loads of gear in there but its more weight and 10 shit speakers are no match for 3 good quality ones.