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Message: <blockquote data-quote="THATpurpleKUSH" data-source="post: 7615632" data-attributes="member: 615398">You would need 41inch long ports to tune to 28hz with 2 4in aero's in 2 cu/ft. You would be better off using 2 3in ports, those will run about 23inchs long for a 28hz tune in 2cu/ft. However you will be loosing volume due to the port displacement so your volume would drop by at least .2cu/ft, which would increase the length of the ports to 25inches.Try something like this, I just made this box, 1.8cu/ft tuned to 32hz with 2 3in pvc ports about 17in long:<img src="http://carphotos.cardomain.com/ride_images/3/109/1749/25270874046_large.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

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