I'm no audiophile, but I'm guessing that the reason they were put there might have been because it allows the sound to be reflected off the windshield back to the driver and passengers. Either that or they wanted to put in six speakers in separate places and that was the easiest place to but two of them...
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Richard
2002 Granite Green EX-L
Splash Guards, Cargo Tray, Weathertech Mats