Well, I'm at least wondering if the same engineers who developed the (complete lack of) crossover for the door mounted 6.5 inch speakers were also on crack when they developed the crossover for the rest of the system. I'm disappointed by the quality and spectral balance of the high frequencies at the outset. But until I get the 6.5" units under control, it's really hard to tell what the tweeters are doing. I may experiment with a high pass filter there as well.

All comments about a crack addled engineering team aside, I'm surprised an Infinity sound system like this ever made it to market. I also own a 2006 Chrysler Pacifica Limited (at one time I had two of these simultaneously). The Pacifica has a 10 speaker Infinity audio system that is excellent in absolute terms and from a completely different universe when compared to the Crossfire.

The crossover is a crucial part of a three way system such as the one in the Crossfire. The whole point of high/mid/low frequency drivers is to only feed the bandwidth to each driver that they are capable of managing. That is the job of the crossover. Separate the frequencies, manage the power, don't let phase get out of alignment. Infinity didn't do a stellar job with the Crossfire.