The Cadillac Deville 2000-2005 contains (4) 5 1/4" door speakers, (2) 1" front tweeters in the A-pillars and a 2 1/2" center front speaker located in dash. The rear dash panel has a 10" woofer. All have a factory amplifier. Beware, the door speakers may be difficult to replace with aftermarket ones b/c of the odd factory hole locations. I am the owner of a 2002 Deville, however I have opted for modification and have (4) 6 1/2" component sets, (4) tweeters, (4) 12" RE audio subs and 4 amps in total, all supported by jvc 7" lcd and a killer crossover/equalizer. Keep in mind, doing this required door mods, trunk mods, Dynamat and (2) Optima yellow tops, what I'm getting at is this wasn't cheap and it is an addiction....but it sounds great.