I keep knocking out the left hatch speaker!

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I hope the problem isn't from mounting. everything has visual clearance, and also the stock 4" speaker failed in the same way. The grille also seems to be clear but I should double check.
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Is there any way to determine the problem, short of replacing the amp and/or HU?
I would suggest replacing the stock HU and amp anyway, they aren't all that great. HU at least would be a start since the HU is known to be a source of distortion more than the monsoon amp is.
I ordered the elemental design speakers for the sail panels as an added bonus.








