I'm a new member here, just recently started browsing the board, but I thought I could add a little here. If you are pushing a lot of power to your subs, the high SPLs can actually modulate the cones of your 6x9s. In other words, since the trunk is somewhat sealed, the pressure of the bass will cause the 6x9 cones to vibrate at the same frequencies. The cones of most 6x9s, or anything other than subwoofers, are not meant to move _THAT_ much, so at some point this movement will cause the 6x9s to bottom out and "rattle". If this happens, you can either remove the 6x9s or you can buy some type of "shrouds" that seal off the bottoms of the 6x9s. I say this from experience, because in one of my other cars I had this problem, and the rattling drove me crazy. Finally, and back to the original question, you should get more bass coming through to the interior from the speaker holes. And if your trunk rattles from the bass, it may help this as well. BTW, if you do have high quality component speakers in the front, you may not miss the rear fill. Think about it, truly all-out home audio systems do not utilize any rear speakers - it's all about what's in front of you. Good luck with your choice :^)
[This message has been edited by Tifosi (edited April 08, 2001).]