Posted June 21, 200718 yr scott ive been trying to email you about cutout sheet for box you designed me and i havent heard a from you so i guess ill try on here and this is the email you sent me with the box specs so it should be easy for you to help me out and its for the box with the sub up and port back thanks From: "Sales Fi Car Audio" <[email protected]>To: "jamal martells" <[email protected]>Subject: Re: box questionDate: Sat, 9 Jun 2007 13:49:56 -0700Im assuming it is for a 15" sub given that it is 3.5 cuft. From the dimension the only way to fit the sub is firing up. I will give you designs for both rear and up firing ports... you can choose which works best for you.Up firing port and sub: 31" Wide X 15" Tall X 21.5" Deep. Port is 2" X 20" (inside of box depth) X 30" long. This nets you 3.5 cuft after port and driver displacement tuned to 28 Hz.Up firing sub and rear firing port" 31" Wide X 15" Tall X 21.5" Deep. Port is 3" X 13.5" (inside height of box) X 32" long. This nets you 3.5 cuft after port and driver displacment tuned to 28 Hz.Please let me know if I can help with anything else.Thanks,ScottFi Car Audio