Will Plastic flatten sound?

By you moving your litening position to different areas around the tweeter has basically eliminated most problems. If they do not sound good with you moving around the tweeter, they will still sound the same with the tweeter moving around you. IE: moving it to the kickpanel. This is why Stevdart suggested to listen to the tweeters with the doors open. If this did not make any difference then there are only a couple of possibilities. One is a bad signal being amplified, the other is just a poor tweeter or crossover that is controlling it. If the rear speakers sound fine (if you have them), this pretty much eliminates the signal as the problem. Try another pair of speakers, even basic coax speakers to see if the top end changes. If it does then we have a problem with the tweeters or the crossovers that control them. Are these the OZ coax's in your sig that are presenting the issues?

i first bought 2 sets of kicker components,i put one set in the rear deck and one set in the doors,after i finshed up the install i turned it on to find out the the front stage just sounded like sh*t, like they were blown or something. so i switched from the front speakers to the back and back to front ... same problem. So a friend of my at the time, who was reallg into this kind of stuff said i needed to build fiberglass enclourses for the front doors. now it took my a while to get them right as this was my first experience w/ fiberglass but after hearing how sick it sounded, ive done it in like 6 of my other cars since than. to me if you want sick sound from the front, there is not another option learn to fiberglass door pods or have someone do them for ya