I was looking in the book my sub came with to see what size box my sub can go in. I'am not sure which size is right . They have specs then it list everything and it says vas(cubic feet) 4.3. Which sounds like the right size for a 15" i think. then it says Enclosure volumes sealed min. sealed 1.0 max 1.9 and it says Enclosure volumes vented 1.7, which i think seems small. Which one is the size for the sub am i just thinking the numbers look small but when layed out are large? let me know i am about to start building my box but not sure what the book means here thanks