Defining the diameter of a driver

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Arno007

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To all the experts: please create a short definition of the diameter of a driver.
Reading through many diy articles this seems to be a topic of debate. Terms such as cut-out diameter, screw pcd, foam od, foam id, and some others are quoted. Furthermore, in catalogues one can find 8" (200mm) drivers with a screw pcd of 178mm.  :thinking:
 
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