3 12's box help

[Wragold 10+ year member]

I love building boxes and my friends puting 3 12's in his car. Im sad to say help bought his speakers before talking to me...he got sony explodes. the not the walmart 50watt ones, but a step up i do believe. any ways i need plans for him. maybe 3ft^3 at maybe 32hrtz. Opinion on cubic feet or hrtz. got plans im interested. Oh total trunk dementions are trunk width is 48'' height is 19'' width is 18''. Thats how much room he has to work with.

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