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Message: <blockquote data-quote="randcuya" data-source="post: 821848" data-attributes="member: 559912"><p>i am going to build a custom box for my ALpine type r, 2004 Model, and i was wondering if anyone has done anything that sounded really good.  i want i to be tuned to low 30's.  this is my first box and i would like to know how to determine port size for different notes.  thanks for all help. Crutchfield says it should be 1.75^3 ft at most, this is after woofer and port displacemnet right?  and also is the air inside the port part of its displacement?</p></blockquote><p></p>

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