I purchased four 5x7 DB 571, I installed one in each front door, and two in the rear. Althought the book calls for 6x9's for the real, the design of the trunk wont allow for it. However, I want to get the best out of theses speakers, they sound petty good with the Poineer deck, but I know they can sound better. Does anyone have any insight as to what is the best amplifier watts will give me the best sound in a 2000 Lincoln town car. I current have one 12inch Sub (Polk DB Type) and it sounds amazing.