Equivalent Speaker Sizes

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Svante said:
Sd is NOT calculated as the area of the cone, but as the area of an imaginary circular disc with a diameter corresponding to the driver diameter (measured at the middle of the cone suspension).

Glad to see the way a cone is measured hasn't changed in the last 30 years. Sorry if I added confusion with saying I had measured the cone area when I meant the effective piston area.

Cheers.
 
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