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Multi-Way Conventional loudspeakers with crossovers

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Old 1st February 2011, 10:58 PM   #1
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Default hourglass shaped enclosure

noob speaker builder here.

Would there be any inherent flaws in a sealed speaker enclosure shaped like this?

Imageshack - jugpg.jpg

with a full range driver mounted at the opening.

any help would be greatly appreciated. Thanks.
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Old 1st February 2011, 11:45 PM   #2
kach22i is offline kach22i  United States
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I was looking for some of those clay pot or vase speakers and found these.

Boynq VASE Speaker - MoreSales.com.my - A Malaysia Web Store
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Acoustic Elegance • View topic - Custom Vase Speakers With Open Baffle MTM
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ITamTam’s Colorful M1 Dock Stool is a Speaker You Can Sit On
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Last edited by kach22i; 1st February 2011 at 11:47 PM.
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Old 2nd February 2011, 04:41 PM   #3
boris81 is offline boris81  United States
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it looks like Shakeweight
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Old 2nd February 2011, 06:57 PM   #4
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I don't think there would be any "flaws" in such a cabinet but there wouldn't be any advantages either; it's a cosmetic exercise only. The challenge would be in the building - could be a lot of work and time involved. I recommend putting resources into sound quality.
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Old 2nd February 2011, 10:54 PM   #5
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would this shape have any advantages over say, a tube of the same volume?

Are there fewer standing waves in either of these shapes vs a box?

thanks for all the help
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Old 2nd February 2011, 11:42 PM   #6
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Quote:
Originally Posted by boris81 View Post
it looks like Shakeweight

lol...I see where your minds at
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Old 4th February 2011, 12:39 AM   #7
Few is offline Few  United States
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If there are advantages to the hourglass shape, I think they would be in the realm of diffraction control on the outside of the cabinet (assuming a tweeter is mounted near the waist) rather than addressing standing wave problems within the cabinet.

If your goal is to eliminate internal standing waves I don't think you'll gain much. Spheres, ellipsoids, hourglass shapes, etc. support standing internal waves in spite of their non-rectilinear shapes.
Few
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Old 4th February 2011, 11:55 AM   #8
kach22i is offline kach22i  United States
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I think there are a few rectangular on the outside speakers which employ elaborate bracing schemes on the inside which avoid 90 degree corners and may in fact be rounded or at least stepped. A variance in cabinet wall thickness resulting from built-up layers of MDF or fiberglass (shot or hand-laid) may also come into consideration.

To really know if you are gaining anything, you would have to build two speakers. One with an internal and perhaps external hourglass shape, and another of a more simple rectangular shape of the same volume and perhaps similar wall stiffness factor.

My guess from observing trends in loudspeaker cabinet design is that the water-bottle or hour-glass shape will tend to sound less "boxy" than a box. If for no other fact than the round form will have less surface area per given volume than the rectangular shape.

http://www.usi.edu/stem/Math_Manipulatives.asp
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Last edited by kach22i; 4th February 2011 at 12:13 PM.
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Old 4th February 2011, 05:31 PM   #9
kach22i is offline kach22i  United States
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One more thought, how about a African drum shape?

handmade African drums, wood,* Woodstock, NY Catskills crafts, drum maker
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This tweeter enclosure gave me the idea.

HiVi TN28 Fabric Dome Tweeter | Parts-Express.com
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* Large non-resonant rear acoustic chamber
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