From my experience, the problem with the rear speakers is that there is a large hole in the bottom of each rear door. Too much air leaks around the door and cancels out the sound of the speakers. I haven't done this yet - my next improvement - but dynamat should work wonders for sealing off that space.
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98.5 Tour SE Sport 2.5 ATX
Mobile 1
80W low /100 W high beam... in transit
