I'm not a stranger to custom audio installs. I spent forever planning the stereo in my Firehawk and the results are fantastic. I have a full system in my saturn also and have been very happy with the results of all the installs i've done. This also isn't my first Mark VIII. I owned a 97 from 2003-2008 but only ever put a sub in that one. The 98 I just picked up has a blown sub driver in the front passenger side. After the successful installs i've done on my saturn and hawk I've decided that a full system replacement may be in order here. However, the JBL system is an almost completely different animal than the monsoon in my hawk. The monsoon had true tweeters in the doors and hatch. The Lincoln has sort of a mid/high driver in the tweeter location and this is the first dilemma i'm encountering in my journey to plan a system. I like the imaging of the factory system. I think it presents a pretty decent sound stage and I know this is because of how the crossovers are set up between the mid/high and bass drivers. I was wondering what the frequency response of the factory mid/high driver is. I know of some tweeters that go as low as 2k hz but i'm sure the factory drivers go lower than that. What if anything could i do to upgrade the factory speakers without losing the factory sound stage. I'm afraid that the direction the bass drivers point would really muddy the sound if too much of the vocal range was coming from the area occupied by my knee. Thanks for any help.