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<blockquote data-quote="joeldirt" data-source="post: 773426" data-attributes="member: 558163"><p>a suggestion:</p><p></p><p>36w X 24D X 16 tall outer dimensions using 3/4" MDF will give you 6.5 cu ft. which is good, now oyu can add in the bracing to reduce vibrations. Keep reinforcing until you reach a 5ft3 box lets say you want to tune the box to 32hz.........</p><p></p><p>if you were to use four 4" ports, the length would have to be 23.5 (you would have to put them side to side rather then front to back so they wont bump into back wall. ( I wouldnt suggest this design)</p><p></p><p>if you had three 4" ports, they would have to be 16 7/8" long</p><p></p><p>two 4" ports= 10 1/8 long.</p><p></p><p><a href="http://www.audiobahninc.com/tech/Calculators/PortLengthCalc.htm" target="_blank">http://www.audiobahninc.com/tech/Calculators/PortLengthCalc.htm</a></p><p></p><p><a href="http://www.the12volt.com/caraudio/boxcalcs.asp" target="_blank">http://www.the12volt.com/caraudio/boxcalcs.asp</a></p><p></p><p>a slot vent 3" wide would have to be 15 13/16</p><p></p><p>4" wide would have to be 24 1/4</p><p></p><p>every one does things different, so you should have a few people putting in their input. what you decide to chose is up to you. Good luck</p></blockquote><p></p>
[QUOTE="joeldirt, post: 773426, member: 558163"] a suggestion: 36w X 24D X 16 tall outer dimensions using 3/4" MDF will give you 6.5 cu ft. which is good, now oyu can add in the bracing to reduce vibrations. Keep reinforcing until you reach a 5ft3 box lets say you want to tune the box to 32hz......... if you were to use four 4" ports, the length would have to be 23.5 (you would have to put them side to side rather then front to back so they wont bump into back wall. ( I wouldnt suggest this design) if you had three 4" ports, they would have to be 16 7/8" long two 4" ports= 10 1/8 long. [URL="http://www.audiobahninc.com/tech/Calculators/PortLengthCalc.htm"]http://www.audiobahninc.com/tech/Calculators/PortLengthCalc.htm[/URL] [URL="http://www.the12volt.com/caraudio/boxcalcs.asp"]http://www.the12volt.com/caraudio/boxcalcs.asp[/URL] a slot vent 3" wide would have to be 15 13/16 4" wide would have to be 24 1/4 every one does things different, so you should have a few people putting in their input. what you decide to chose is up to you. Good luck [/QUOTE]
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