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Car Audio Discussion
General Car Audio
Geting Proper Port Area
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<blockquote data-quote="Jeffdachef" data-source="post: 8406979" data-attributes="member: 650438"><p><strong>Quoted from quentin jarrel, owner of dss</strong></p><p></p><p>"So basically the 12-16 port area thing is just a simple guideline, The real method is to find the minimum square inches of port area.</p><p></p><p>Thiele Small's formula</p><p></p><p>dv = 39.37 (fb x Vd)^1/2</p><p></p><p>dv= minimum port diameter of vent in inches</p><p></p><p>fb= box tuninf frequency in hertz</p><p></p><p>vd= cone displacement in cubic meters (one way xmax in meters times cone area(SD) in meters)</p><p></p><p>for one BL 15</p><p></p><p>xmax= .018 meters</p><p></p><p>sd= .081 meters^2</p><p></p><p>tuning= 32 hertz (per you)</p><p></p><p>dv= 39.37 (32 x .018 x .081) ^1/2 (^1/2 means square root)</p><p></p><p>dv= 39.37 (.046656)^1/2</p><p></p><p>dv= 39.37 (.216)</p><p></p><p>dv=8.5 inch diameter port per sub</p><p></p><p>dv=56.72 square inches</p><p></p><p>for two BL 15's you need (2)dv. So you need 113.44 square inches of port or more."</p></blockquote><p></p>
[QUOTE="Jeffdachef, post: 8406979, member: 650438"] [B]Quoted from quentin jarrel, owner of dss[/B] "So basically the 12-16 port area thing is just a simple guideline, The real method is to find the minimum square inches of port area. Thiele Small's formula dv = 39.37 (fb x Vd)^1/2 dv= minimum port diameter of vent in inches fb= box tuninf frequency in hertz vd= cone displacement in cubic meters (one way xmax in meters times cone area(SD) in meters) for one BL 15 xmax= .018 meters sd= .081 meters^2 tuning= 32 hertz (per you) dv= 39.37 (32 x .018 x .081) ^1/2 (^1/2 means square root) dv= 39.37 (.046656)^1/2 dv= 39.37 (.216) dv=8.5 inch diameter port per sub dv=56.72 square inches for two BL 15's you need (2)dv. So you need 113.44 square inches of port or more." [/QUOTE]
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Geting Proper Port Area
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