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calculate a subwoofers Vd (1 Viewer)

MikeDuke

Stunt Coordinator
Joined
Jul 6, 2004
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248
If I have all of the Thiel specs for my driver, how do I try to figure out what the Vd (displacement) might be. Is there a site that does this for you?

Thanks
 

Edward J M

Senior HTF Member
Joined
Sep 22, 2002
Messages
2,031
It's basically the effective surface area of the driver (Sd) multiplied by the maximum linear travel Xmax, multiplied by 2 for one full stroke (both directions).

You might have to do some unit conversions to make it work out right, but the math isn't terribly challenging.
 

MikeDuke

Stunt Coordinator
Joined
Jul 6, 2004
Messages
248
Does This look right?
Sd=551.5
Xmax=9mm
551.5 Sq cm * 9mm *2=9927cc
605 Cubic inches

Thanks again.
Forgive my ignorence
Mike D
I know what I like when I hear it. :D
 

Edward J M

Senior HTF Member
Joined
Sep 22, 2002
Messages
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551.5 cm2 x 9 mm (1cm/10mm) x 2 = 992.7 cm3

992.7 cm3 (1Liter/1000cm3) = 0.9927 Liters (the most common unit to express Vd)

or

992.7 cm3 (1in3/16.39cm3) = 60.57 in3
 

MikeDuke

Stunt Coordinator
Joined
Jul 6, 2004
Messages
248
Thanks Dave and Ed for your reply.
I know it may seem simple but I was never any good at this stuff. You know, figuring out equations. Being in L.D math in high school had its disadvntages. Thanks again for working it out for me.

Mike D
I know what I like when I hear it :D
 

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