2 quick questions?

[Wragold 10+ year member]

I have a 15'' RD Audio Alpha, how do i figure out the Woofer Xmax on it and all other speakers. Also how do you figure out driver displacement.

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[azbass 5,000+ posts]

math and a special tool for measuring xmax/etc.

 

[Wragold 10+ year member]

I need to know it for my friends box. im going to use Subwoofertools.com and there free ported box plans and it wont work with out those calculations. So does anyone know the Xmax and driver displacement on a 12'' Kicker CompVT.

 

[azbass 5,000+ posts]

kicker would probably know that.