Another Idea is a component set. 5.25's fit with ease, just need a mounting plate. My Quart Q's dropped right in. I placed the woofer at the top of the hole and the tweeter below. With the tweeter this way it allows for better imaging. (cant explain thip Phoenom, but a good friend and IASCA Legend told me this. Has to do with mid range frequency and its behavior) Used Masonite covered in dynamat and used the factory mounting holes.
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Commonsense may not be as common as I thought