Question about woofer displacement

[t-scene 10+ year member]

How is woofer displacement measured?

Just wondering because it doesn't make since that a subwoofer with a larger motor would be the same displacement as a smaller one.

Sundown E 12: 0.12

Sundown SA 12: 0.14

Sundown Zv3 12: 0.12

Fi SSD 12: 0.14

Fi Q 12: .016

Fi BL 12 : 0.18

Mmats P3 12: 0.15

Mmast Dreadnaut 12: 0.25

Mmats Juggernaut 12: 0.35

I haven't seen all of the subwoofers in person but I own a SA12 and Juggernaut 12. The Jugg is noticeably bigger but is it really that much larger than a Sundown Z?

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[naughtyca 10+ year member]

i think you have other stuff to worry about in building a box than woofer displacement from subwoofers you are comparing its very minute difference