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The downside to aiming speakers into the windshield is the wonky midrange response you get due to the varying phase shift based on the distance from the speaker to the glass relative to each wavelength. At higher frequencies, the wavelengths are so short, that our brain is no longer able to use timing to locate sound, and instead shifts to purely intensity-based means as the frequencies increase.

What I'm saying is, if you leave the midrange aimed into the windshield, I'm not sure how much you'll actually gain. Been playing around with a pair of Unity 8s in the dash of my beater and it's definitely "different" compared to not playing into the windshield. Turning the Unitys on and off while messing with the crossover frequency, so little sound comes out at 2.5khz and above, I can't see moving just the tweeter would make a whole lot of difference. I'm interested to hear thoughts from those in the know as the "upgrade bug" has already bit and you know, always thinking about what's next...
 
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