In the name of getting a little bit better sound from the rear speakers, I used some of those foam "hats" underneath the speaker. That keeps the sound coming from the back of the speaker from canceling out some of the sound coming from the front of the speaker. Do you follow what I'm saying? I mean if you hold a speaker out in a room with no enclosure, it sounds terrible. Drop it down in a hole or an enclosure, and VOILA! it comes to life. HTH. Rahn
BTW, I made a plate for mine and used a 6.5 and a tweeter. Much better than stock!