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<blockquote data-quote="Moble Enclosurs" data-source="post: 7538861" data-attributes="member: 634917"><p>Yes. To start, you know your volume of the chamber, and your desired tuning so far. the complex way is to get everything together, but for simplicity and lack of accuracy, i can give you an idea of what to do. First, you know to subtract displacement form the chamber volume of the driver and port, or simply the driver, and add the port to the exterior of the volume. I am going to keep it very simple and basic for now. Try using a port(round) of half the area of the driver or around that. For an 8, 3", for a 10 4", for a 12 6", for a 15 8" or two 4", etc. This is very very basic and is not a way to be accurate 9and some may chime in and say other things as well, but this is what I can do without getting too involved, unless you want me to do a design for you.</p><p></p><p>Now, you have tuning, chamber volume, and port area. You need length. So, say you are using the 4" port and you want a 35Hz tuning. Well, if you cannot change chamber volume for fine tuning, you have to get the length right on. So, the best way to do this is with this:</p><p></p><p>Take the radius of the port, say 2". Square it to get 4. Then take 10^7 and multiply it by 4. Then take 1.463 times that. Write that number down. You should get 58520000. Then take the 1.463 and multiply by the radius of the port (which is 2). Write that down, which should give you 2.926. Then take the box volume, 1.6 cubic ft. Multiply by 1728 to get cubic in. You get 2764.8. Then take the tuning of 35Hz^2, which is 1225. Multiply 1225 by 2764.8 to get the third needed number to write down which is 3386880. Then divide the first number, 58520000 by the third number 3386880 to get 17.28. Then subtract the second number of 2.926 to get 14.35" port. This is the common form to get the length and is based on a restricted chamber volume. hope that helps. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="Moble Enclosurs, post: 7538861, member: 634917"] Yes. To start, you know your volume of the chamber, and your desired tuning so far. the complex way is to get everything together, but for simplicity and lack of accuracy, i can give you an idea of what to do. First, you know to subtract displacement form the chamber volume of the driver and port, or simply the driver, and add the port to the exterior of the volume. I am going to keep it very simple and basic for now. Try using a port(round) of half the area of the driver or around that. For an 8, 3", for a 10 4", for a 12 6", for a 15 8" or two 4", etc. This is very very basic and is not a way to be accurate 9and some may chime in and say other things as well, but this is what I can do without getting too involved, unless you want me to do a design for you. Now, you have tuning, chamber volume, and port area. You need length. So, say you are using the 4" port and you want a 35Hz tuning. Well, if you cannot change chamber volume for fine tuning, you have to get the length right on. So, the best way to do this is with this: Take the radius of the port, say 2". Square it to get 4. Then take 10^7 and multiply it by 4. Then take 1.463 times that. Write that number down. You should get 58520000. Then take the 1.463 and multiply by the radius of the port (which is 2). Write that down, which should give you 2.926. Then take the box volume, 1.6 cubic ft. Multiply by 1728 to get cubic in. You get 2764.8. Then take the tuning of 35Hz^2, which is 1225. Multiply 1225 by 2764.8 to get the third needed number to write down which is 3386880. Then divide the first number, 58520000 by the third number 3386880 to get 17.28. Then subtract the second number of 2.926 to get 14.35" port. This is the common form to get the length and is based on a restricted chamber volume. hope that helps. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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