Well, my current setup now is MB Quart 5.25"s in the front doors, and Eclipse 3-way component 6x9"s on the rear deck, with a 150x4 amp with a capacitor running the speakers and a 300watt monoblock powering my 12. I have plenty of bass, but I find with the music I play (mostly heavy metal) that I really dont have much in the way of upper-mid bass, and alot of the sound in that music comes in there. The headunit is a brand frieken new Eclipse CD8445. Question is : do I replace the rear speakers with a speaker that has more mid-bass setup and leave the doors as they are and get MB Quart tweeters, or is there a smaller mid-bass speaker i can put in the doors and leave the rear deck alone. I ask this becuase the doors act as enclosures, and i havent really delt with true "open-air" bass speakers. I am going to get my tweeters replaced and have the headunit's amp power those, so high's is not a problem. Also, soon I will be upgrading from my Adire Shiva 12" to a JL 10w series, would the w7 be good, or will the w6 be more appropriate for the music that I listen to? By the way, its a 2000 Prelude.