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<blockquote data-quote="evo2k3" data-source="post: 121971" data-attributes="member: 546246"><p>use the equations jmac was so nice to provide to calulcate port length:</p><p></p><p>For a rectangular box ...</p><p></p><p>H = Height</p><p></p><p>W = Width</p><p></p><p>D = Depth</p><p></p><p>C = Thickness of MDF, fibreglass, or whatever the box is made of</p><p></p><p>V = Volume</p><p></p><p>P = Pi</p><p></p><p>R = Radius</p><p></p><p>S = Speaker displacement</p><p></p><p>Vport = port volume</p><p></p><p>Vslot = extra displacement of material used to create slot port</p><p></p><p>Vbrace = displacement of braces used</p><p></p><p>(H - 2C)(W - 2C)(D - 2C) - S - Vport - Vslot - Vbrace = Vbox</p><p></p><p>P*R^2 = Port Area of a circular port</p><p></p><p>Hport*Wport = Port area of a slot/rectangular port</p><p></p><p>P*R^2*Dport = Port volume of a circular port</p><p></p><p>Hport*Wport*Dport = Port volume of a slot/rectangular port</p><p></p><p>Hport*C*Dport = Added displacement of slot port if wall is used as one of the sides of the port.</p><p></p><p>Hport*2C*Dport = Added displacement of slot port if wall is not used as one of the sides of the port.</p><p></p><p>one thing i know you want to void making a slot port with a ratio of h:w of more than 9:1....something about frication comeing into play then....hey and theres no need to act like a 13 year old and quote this 20 times please. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif</p></blockquote><p></p>
[QUOTE="evo2k3, post: 121971, member: 546246"] use the equations jmac was so nice to provide to calulcate port length: For a rectangular box ... H = Height W = Width D = Depth C = Thickness of MDF, fibreglass, or whatever the box is made of V = Volume P = Pi R = Radius S = Speaker displacement Vport = port volume Vslot = extra displacement of material used to create slot port Vbrace = displacement of braces used (H - 2C)(W - 2C)(D - 2C) - S - Vport - Vslot - Vbrace = Vbox P*R^2 = Port Area of a circular port Hport*Wport = Port area of a slot/rectangular port P*R^2*Dport = Port volume of a circular port Hport*Wport*Dport = Port volume of a slot/rectangular port Hport*C*Dport = Added displacement of slot port if wall is used as one of the sides of the port. Hport*2C*Dport = Added displacement of slot port if wall is not used as one of the sides of the port. one thing i know you want to void making a slot port with a ratio of h:w of more than 9:1....something about frication comeing into play then....hey and theres no need to act like a 13 year old and quote this 20 times please. [IMG]//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif[/IMG] [/QUOTE]
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