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Low Earth Orbit
DIY Audio
No compromises front loaded double 18” cab
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<blockquote data-quote="Peter Morris" data-source="post: 132006" data-attributes="member: 652"><p>Re: No compromises front loaded double 18” cab</p><p></p><p></p><p></p><p></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">If you divide the box in half it will slightly lower its tuning frequency – in simple terms the port length, because it now includes the box wall on one side will appear a bit longer.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">I would however joint the middle section of the port to the back of the box and add bracing on the top, bottom, back and sides. Bracing from side to side, or back to front will greatly reduce the cabinet’s deflection.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">In simple terms the deflection of a beam is proportional to its length cubed, so halving the length has a dramatic effect. In this case it’s a rigidly supported plate … it’s a bit more complicated but in principle its similar.</span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span></p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'"></span></span></span><em><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Note: If you choose this box design it will need to be slightly retuned if you use a different driver eg. B&C 18WS115</span></span></span></em></p></blockquote><p></p>
[QUOTE="Peter Morris, post: 132006, member: 652"] Re: No compromises front loaded double 18” cab [SIZE=3][COLOR=#000000][FONT=Calibri]If you divide the box in half it will slightly lower its tuning frequency – in simple terms the port length, because it now includes the box wall on one side will appear a bit longer. [/FONT][/COLOR][/SIZE][SIZE=3][COLOR=#000000][FONT=Calibri]I would however joint the middle section of the port to the back of the box and add bracing on the top, bottom, back and sides. Bracing from side to side, or back to front will greatly reduce the cabinet’s deflection. [/FONT][/COLOR][/SIZE][SIZE=3][COLOR=#000000][FONT=Calibri]In simple terms the deflection of a beam is proportional to its length cubed, so halving the length has a dramatic effect. In this case it’s a rigidly supported plate … it’s a bit more complicated but in principle its similar. [/FONT][/COLOR][/SIZE][I][SIZE=3][COLOR=#000000][FONT=Calibri]Note: If you choose this box design it will need to be slightly retuned if you use a different driver eg. B&C 18WS115[/FONT][/COLOR][/SIZE][/I] [/QUOTE]
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No compromises front loaded double 18” cab
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