I've heard of 1 case where mounting the crossover on the door may have caused problems.
I've seen a few installs the have the crossovers on the doors. If you look around cardomain.com you can find many more. I think a few of the resident experts (Team SD) have approved before.
My personal thoughts would be that closing a car door makes a large amount of force (Greater further away from the door hinge). Also the higher the quality of the components the better the build of the crossover. I think it would be fair to assume the cheap crossovers would fall apart much quicker from the force generated while closing the door.
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just something else i'll accomplish...
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