i dont know much either about car audio, but i do know this when i had my grand am, it had 2 orion 12 in a sealed box which was ported through the package shelf
the installer made a port out of pvc, from the box to the package shelf, he cut a hole in the metal, i still ran speakers in the rear and the package shelf had a screen and a hole for the port
the bass was nuts!! it was loud as hell, and i remember hitting a 150db with this set up
this is like the first post that you made that makes sense
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