i know i could have gotten something louder than the 5400 for $720 but when i got it i wanted very clean and undestorted bass. Thats why i didnt go with anything else. you think you have heard bass but when you listen to a 5400, even with only 500 watts, it sounds totally different to what you have heard from any other speaker, simply amazing. but now im just looking to go as loud as possible. i really like the idea of 2 18"s so i think that is the way i want to go. what 18"s would be really loud in a subaru legacy station wagon??