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<blockquote data-quote="Randy Savage" data-source="post: 134246" data-attributes="member: 545614">I don&#039;t feel like doing math, so here are the equations for everything, thanks to Jmac-For a rectangular box ...H = HeightW = WidthD = DepthC = Thickness of MDF, fibreglass, or whatever the box is made ofV = VolumeP = PiR = RadiusS = Speaker displacementVport = port volumeVslot = extra displacement of material used to create slot portVbrace = displacement of braces used(H - 2C)(W - 2C)(D - 2C) - S - Vport - Vslot - Vbrace = VboxP*R^2 = Port Area of a circular portHport*Wport = Port area of a slot/rectangular portP*R^2*Dport = Port volume of a circular portHport*Wport*Dport = Port volume of a slot/rectangular portHport*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.</blockquote>

[QUOTE="Randy Savage, post: 134246, member: 545614"] I don't feel like doing math, so here are the equations for everything, thanks to Jmac- 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. [/QUOTE]

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