I may need to replace my front Polk DB690 speakers with some of the Polk componenet speakers, I'm thinking the Polk MMC6500. I think the trick to better sound is getting it up in the air, away from my feet. These come with the 1" dome tweeters, wondering if these will fit to replace the exising ones, or should I pop them into the door panels? Also, if anyone knows, should I amplify these or not. I'm also looking at the Alpine SPR-13S speakers. While crutchfield says they will fit, the guy at the local shop says they wont. Also, should I amplify these speakers, or leave them as is going through my Eclpise cd3100 HU.