How is the effective piston area of a cone calculated? - diyAudio
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Old 21st June 2004, 07:57 PM   #1
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Default How is the effective piston area of a cone calculated?

It probably isn't pir^2... Anybody know?
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Old 21st June 2004, 08:06 PM   #2
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Usually the diameter is measured as the actual cone diameter plus half of the surround on both sides. Then it's pi X (dia/2)^2
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Old 21st June 2004, 08:51 PM   #3
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Yes, it is:
Sd = pi * radius ^2

or, since radius = Dia/2

Sd = pi*(Dia/2)^2 = (pi*(Dia)^2)/4

As Rodd says, you should include half of the surround. The easiest way to measure diameter is to measure across the diameter on opposite sides of the surround. See picture.
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