Help with cone area?

Hi, I just wanted some input on the cone area to use in calculations. I am making a T-Line box for a SQ HDS208. The spec sheet lists the 'piston diameter' to be 162mm(~6.3 in). That's pretty much the same distance if you measure the diameter starting from halfway into the surround. Here's an image I scaled:
FUllJT5.jpg


From the picture, the diameter starting from halfway into the surround is ~6.3 in. So using Pi*r^2 to get area of circle, I get ~32 in.^2

Is this the correct way to approach finding the area of the cone and using it as the port area for a T-line?

Thanks for any input.

 
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