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<blockquote data-quote="IshbOO" data-source="post: 856461" data-attributes="member: 556188">im trying to design a box now with this method and I&#039;m having trouble finding out my second wall length. I get a negative number everytime I try to do so.outside 16x33.5x20inside = 14.5x32x18.5Port14.5x3Fb is the tuning frequency you want: 34hzVb is the internal volume of your box: 4.0cuftAv is your port area (height x width of the port face): 14.5*3 = 43.5Lv is port length: 18.4118.41 - 1.5 =&nbsp; physical LV(portlength) 16.91step 6 + 716.91 - (10in + 1.5mdf) = 8.41(8.41 * 3 .75 )(14.5*) / 1728 = 0.26^3 displacementFirst wall 15*3.75(14.5)/1728 = 0.44^3 displacement.18+.18+.2199+.44 = 5.0199^3 box size, after displacementdepth 18.5wall one 18.5 - 3 = 15.5wall two 16.91 - ( 18.5 +1.5) = -3.09  any help? plz thanks does this mean i dont even need that second wall? or what im confused?</blockquote>

[QUOTE="IshbOO, post: 856461, member: 556188"] im trying to design a box now with this method and I'm having trouble finding out my second wall length. I get a negative number everytime I try to do so. outside 16x33.5x20 inside = 14.5x32x18.5 Port 14.5x3 Fb is the tuning frequency you want: 34hz Vb is the internal volume of your box: 4.0cuft Av is your port area (height x width of the port face): 14.5*3 = 43.5 Lv is port length: 18.41 18.41 - 1.5 = physical LV(portlength) 16.91 step 6 + 7 16.91 - (10in + 1.5mdf) = 8.41 (8.41 * 3 .75 )(14.5*) / 1728 = 0.26^3 displacement First wall 15*3.75(14.5)/1728 = 0.44^3 displacement .18+.18+.2199+.44 = 5.0199^3 box size, after displacement depth 18.5 wall one 18.5 - 3 = 15.5 wall two 16.91 - ( 18.5 +1.5) = [B]-3.09 [/B] [B] [/B] [B]any help? plz thanks[/B] [B] [/B] [B]does this mean i dont even need that second wall? or what im confused?[/B] [/QUOTE]

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