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» Termpro Audio Forum » Installer's Corner » Advanced Topics » measure xmax

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Twellmann
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is it it somehow possible to measure the xmax of a speaker if it is not supplied

[ 10-13-2003, 11:51 AM: Message edited by: Twellmann ]

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guitar maestro
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well first you would have to know what Xmax means to you, since Xmax is not standardized

if you consider Xmax to be what DLC considers it to be, then all you have to do is build your own DUMAX machine from the ground up [Smile]

or get a hold of ultra-expensive FEA magnetics software to get a pretty darn good approximation

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Twellmann
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well it's not that important [Big Grin]

I just needed it to calculate portnoise in win isd, so i guess if I set a bit too high ill be in the clear-zone [Big Grin]

I kinda knew it wouldnt be so easy, but you never know...

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well i'm sure if you can supply Dan Wiggins with certain info like top plate thickness, voice coil diameter, impedance, pole-vent diameter, and maybe some other stuff, he might have time to conjure up an FEA model to give you a best case scenario

but then again, he is a busy guy....try emailing him at this Adire addy...you never know

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808BMW
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Rig up a mold of modeling clay and woof your sub, then measure.
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Twellmann
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quote:
well i'm sure if you can supply Dan Wiggins with certain info like top plate thickness, voice coil diameter, impedance, pole-vent diameter, and maybe some other stuff, he might have time to conjure up an FEA model to give you a best case scenario
that would mean i should disassemble the speaker, which I don't really feel like [Smile]

but thanks anyway

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kmon
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You could always glue a small mirror on the cone and use a laser to measure travel. Just like physics 101 back in high school [Big Grin]
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Twellmann
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well then, based on your pure experience, guess!!

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Dukk
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Throw in 0.35"

I bet it wouldn't be far off.

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Blow your mind - PORT your box!

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Twellmann
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well, thats somewhat less than I would expect

they claim that the cone has a throw of 50mm,

but I guess that's just how far the suspension,
allows you to move the cone when you would push
it, to its farthest extent

[Big Grin] [Big Grin]

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