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Old 03-09-2010   #1
 
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Default Calculating Speaker displacement

I'm building a box for an a/d/s/ 310px (first box build). Manual recommends a 1.0 cubic foot sealed enclosure. However, the manual doesn't give a spec for the driver's displacement. Could it be that you're supposed to build a 1.0 cubic foot box, install the speaker, and the airspace left over is what the driver wants. Yeah, I doubt it too.

Is there any method/rule of thumb for calculating speaker displacement?
Or: does anyone happen to know what the displacement of the 310px is?

BCAE says to wrap the speaker in plastic, dunk it in a full bucket of water. Whatever it takes to refill the bucket is your displacement figure.
Can't bring myself to dunk a $500 speaker in water!

Thanks!
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Old 03-09-2010   #2
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Default Re: Calculating Speaker displacement

.5 will be close enough for a sealed box

here is a random 10" driver = Displacement – 0.12 cu. ft. ...

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Old 03-09-2010   #3
 
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Default Re: Calculating Speaker displacement

Juding from pictures I would say the displacement is around .08-.12 cuft.. Probably not enough to make a difference. If you're really worried about it just stuff the box with polyfill and that will make up for it.
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Old 03-09-2010   #4
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Default Re: Calculating Speaker displacement

Building a sealed box a little big or a little small won't do much to it. Nice sub, I don't blame you for not wanting to dunk it. I think if you were talking about a ported box, you might have to go through such drama. Not so in this case. I'd just build the box a little big (or a lot bigger) and enjoy the lower F3 you'll get as a result. Poly too.

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Old 03-09-2010   #5
 
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Default Re: Calculating Speaker displacement

Thanks for the replies.

Being new-ish at this stuff, I guess that was my main concern: whether it's critical to hit these volume specs right on the mark, or if there's a bit of latitude to play with. I guess there's more latitude than I thought.
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Old 03-09-2010   #6
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Default Re: Calculating Speaker displacement

The more complicated the box (ie. ported and bandpass), the more critical. Sealed boxes are just slightly less complicated than an IB install. enjoy going slightly larger than stock (or measure the T/S params and verify what box size you REALLY want) and enjoy.

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Default Re: Calculating Speaker displacement

Quote:
Originally Posted by fourthmeal View Post
The more complicated the box (ie. ported and bandpass), the more critical. Sealed boxes are just slightly less complicated than an IB install. enjoy going slightly larger than stock (or measure the T/S params and verify what box size you REALLY want) and enjoy.
Pardon my ignorance; what is an IB install?

Thanks
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Default Re: Calculating Speaker displacement

Infinite Baffle. IE, separation of back wave from front, but no box.

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Default Re: Calculating Speaker displacement

Basic Car Audio Electronics learn it, live it, love it.

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Default Re: Calculating Speaker displacement



For what it's worth, I once making a box once, and like your case, the manufacturer only included box size and not driver displacement. I contacted product support, and they told me the box specs took driver displacement into consideration.
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