I have a design already for a down firing box, but anyways. I have a 06 chevy silverado ext cab and 4 ia 187 12"s what direction is best for sound quality, I'm not looking to put up any numbers just clean bass. what is the best sub and port direction?





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so were good. I vote take the back seat out and do a 8cu ft box tuned @ 30hz subs up port up 

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