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Spherical Speakers
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Old 19th December 2007, 05:06 PM   #1
Ironhead is offline Ironhead  United States
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Default Spherical Speakers

Hi,

I am planning on building a pair of spherical speakers using W3-871SC Full Range drivers. I know a sphere front and a tapered tube for the back is better than a sphere but I'm going with the sphere because of how I want it to look. I want to know if porting it would be practical instead of leaving it sealed. Also what method should I use to reduce resonances? The internal diameter will be 8-1/2 inches. I will use Tuf Cal plaster as the enclosure material.
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Old 20th December 2007, 02:33 PM   #2
smallangryboy is offline smallangryboy  United Kingdom
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I used Jordan JX92s in a sealed 3 litre enclosure to create my spheres. Though I got the enclosures hand turned out of American Black Walnut [beyond my skill]

They sound excellent when positioned near a wall, and with a matching sub woofer do justice to any CD or DVD !

I found that porting wasn't really necessary [and would have been difficult in such a small enclosure]

The shape itself tends to reduce any sort of problem with resonance, and stuffing it lightly with polyester wool gives good results with the mid range.

Good luck with your spheres, post some images when your done !!!
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Old 20th December 2007, 06:01 PM   #3
sreten is offline sreten  United Kingdom
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Hi,

I get around 4 litres for your sphere. Zaphs measurements for
3" drivers all have Vas < 1 litre and ~ 1/2 specified values.
Reflexing is pointless with typical Qts values. 2L to 3L sealed.

http://www.diyaudio.com/forums/showt...401&highlight=

/sreten.

P.S. I have a zipped file for Zaph's article.
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Old 20th December 2007, 06:47 PM   #4
Ironhead is offline Ironhead  United States
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Beautiful speakers smallangryboy. And thanks for the advice from both of you. I used win isd to get the Vb of my enclosure then I used a calculator I made to calculate the same size sphere that would need to give me that internal volume. I asumed that this program was accurate but I don't know. I noticed that win isd takes into acount measurements from small speakers more accurately than many online calculators that just aproximate the measurements for smaller speakers based on some kind of size limit. ex. smaller than 4 or 5 inches.
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Old 20th December 2007, 07:43 PM   #5
TNT is offline TNT  Sweden
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Ikea ? :-)

http://www.diyaudio.com/forums/showt...942#post989942

/
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Old 21st December 2007, 02:00 AM   #6
Ironhead is offline Ironhead  United States
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Awesome. What did you use to make them?
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Old 21st December 2007, 02:23 AM   #7
GuyPanico is offline GuyPanico  United States
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My little spheres

http://www.diyaudio.com/forums/showt...hreadid=111590
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Old 21st December 2007, 05:15 AM   #8
Ironhead is offline Ironhead  United States
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Nice!

Made out of bowls from Target eh. I thought about using some bowls from under our sink today as making them with plaster would take too long (because of waiting for the plaster to be delivered). And cost much more than I really want to spend. I'm sure someone would have been angry if I did.lol
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Old 21st December 2007, 09:22 AM   #9
smallangryboy is offline smallangryboy  United Kingdom
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TNT

Lovely ! I wanted to make a matching sub woofer fro my spherical speakers, but couldn't get over the logistics , do you have some instructions about how you went about making your metal enclosure, and a parts list
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Old 21st December 2007, 12:11 PM   #10
el`Ol is offline el`Ol  Germany
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Not mine, found them in the Manger DIY zone:
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